Kia2002–2024 Critical issues documented

Kia Sorento UM: common faults & what to check

The UM is the Kia Sorento built 2015–2020. It was sold here with the 2.2 diesel and 3.3 V6 petrol. Of the 29 faults documented for the Sorento, 8 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

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Documented faults

Critical

Most serious

$500–$4,000

Typical repair

Systems covered

You're looking at the UM

2 engine variants are documented for this generation. Pick yours to narrow further, or keep reading for the generation as a whole.

Kia Sorento, UM (2015–2020) (KickTyres illustration)

2015–2020UM Selected2015–2020UM2.2 dieselDieselDocumented issues6 knownSee faults & what to checkKickTyres illustration, not a photograph.

2015–2020UM Selected2015–2020UM3.3 V6 petrolPetrolDocumented issues3 knownSee faults & what to checkKickTyres illustration, not a photograph.

Choose a different generation

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Which engine is in it?

2.2 diesel· 2.2 litre diesel 3.3 V6 petrol· 3.3 litre petrol

A 2016 Kia Sorento is the UM generation (2015 to 2020).

Start your free check on this Kia Sorento

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Kia Sorento UMEngine not picked yet

Pick the engine above first: the Sorento came with 2, and without it the report has to show all of their faults. Pick the engine

Can't confirm for this car

Kia Sorento · 2016

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

No engine is recorded for this vehicle.

matched on year only

What to look out for

The checks worth doing on a Kia Sorento before you hand over any money. Every documented fault is listed below, each with its own page.

Costly issue
Inspect the full panoramic sunroof glass panels for any micro-cracks, stress marks, or edge chipping.
See why
Panoramic Sunroof Glass Spontaneous Stress Fracture
UM Sorento models fitted with the optional panoramic sunroof have experienced spontaneous shattering of the fixed rear glass panel under thermal stress, road vibration, or minor impacts. The tempered glass can fracture without any apparent external cause. NHTSA opened investigation PE19002 into this issue across multiple Kia and Hyundai models. Glass replacement is costly and sunroof drain blockage can compound the issue by allowing water ingress to the headliner and electrical components.
What you would notice
- Spider-web crack pattern appearing in sunroof glass with no obvious impact source
- Loud pop or crack sound from the roof while driving
- Water leaking through headliner after rain (drain blockage)
- Glass shards falling into cabin or onto bonnet
Typically $1,500–$4,500 to put right.

See all 8 issues for this oneDocumented for the exact year and engine you picked, including 1 rated critical.

Body, brakes, suspension & interior1

01Panoramic Sunroof Glass Spontaneous Stress Fracture

Inspect the full panoramic sunroof glass panels for any micro-cracks, stress marks, or edge chipping.2015–2020Body & Rust$1,500–$4,500

OccasionalBody & Rust $1,500–$4,500 to fix

UM Sorento models fitted with the optional panoramic sunroof have experienced spontaneous shattering of the fixed rear glass panel under thermal stress, road vibration, or minor impacts. The tempered glass can fracture without any apparent external cause. NHTSA opened investigation PE19002 into this issue across multiple Kia and Hyundai models. Glass replacement is costly and sunroof drain blockage can compound the issue by allowing water ingress to the headliner and electrical components.

Symptoms to notice

Spider-web crack pattern appearing in sunroof glass with no obvious impact source
Loud pop or crack sound from the roof while driving
Water leaking through headliner after rain (drain blockage)
Glass shards falling into cabin or onto bonnet

What to check

Inspect the full panoramic sunroof glass panels for any micro-cracks, stress marks, or edge chipping.
Test all four drain outlets by pouring a small amount of water into the sunroof channels and verifying drainage exits underneath the vehicle.
Check the headliner and A-pillar trim for water staining.
Verify whether any insurance claim has been made for glass replacement.

Where to look: Roof — panoramic sunroof glass panels, front and rear sections

Ask the seller

“Has the panoramic sunroof glass ever cracked, been replaced, or shown signs of stress fracturing?”
“Have the sunroof drains been cleared and is there any water staining in the headliner?”

Depends on the exact engine — 7 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.

Engine, transmission & cooling6

01Theta II GDI rod bearing failure - catastrophic engine failure (UM 2.4 GDI)

Cold-start it and listen for a deep bottom-end knock.petrol2015–2020EngineCan't confirm for this car$8,000–$14,000

OccasionalEngine $8,000–$14,000 to fix

Can't confirm for this car

UM Sorentos with the 2.4 Theta II GDI petrol engine (common in NZ-new and imported base models) are exposed to the infamous Theta II rod bearing failure: machining debris restricts oil flow to the connecting rod bearings, which wear, knock and then seize the engine, sometimes with a rod through the block. In the US this triggered a recall, class-action settlements, a Knock Sensor Detection System (KSDS) software update and lifetime engine warranty programs - protections that do not automatically extend to NZ/AU cars. A knocking Theta II is a dead engine walking.

Symptoms to notice

Deep knocking that rises with rpm
Metal particles in the oil
Oil pressure light flickering
Sudden engine seizure / loss of power

What to check

Cold-start it and listen for a deep bottom-end knock. Rev gently to 2000 rpm - a knock that speeds up with revs is rod bearings. Check whether the KSDS software update was done and ask about any Kia engine inspections. Walk away from any knocker unless priced as needing an engine.

Where to look: Engine bottom end (crankshaft and rod bearings), engine bay

Ask the seller

“Has the engine ever been replaced under a Kia campaign?”
“Has the knock sensor (KSDS) update been done?”
“Any bottom-end noise ever investigated?”

02D4HB 2.2 CRDi Timing Chain Tensioner Wear

Cold-start the engine after at least four hours standing and listen carefully for chain rattle from the front of the engine in the first 15 seconds.diesel2015–2020EngineCan't confirm for this car$1,800–$5,500

OccasionalEngine $1,800–$5,500 to fix

Can't confirm for this car

The D4HB 2.2-litre diesel engine in UM Sorento uses a hydraulic timing chain tensioner that is prone to losing oil pressure after extended cold-soak periods. On cold starts the tensioner can fail to take up slack instantly, allowing the chain to slap the guide rail. Prolonged or severe tensioner wear leads to timing chain stretch, which if uncorrected can result in jumped timing and bent valves requiring full head or engine rebuilding.

Symptoms to notice

Rattling or chattering noise from front of engine on cold start, fading after 10–20 seconds
Engine management light with camshaft/crankshaft correlation codes (P0016, P0017)
Rough running or misfires after cold soak in winter
Timing chain visible slack on inspection with cam cover removed

What to check

Cold-start the engine after at least four hours standing and listen carefully for chain rattle from the front of the engine in the first 15 seconds.
Check for fault codes P0016 or P0017 indicating cam-to-crank correlation error.
Review service records for timing chain tensioner replacement or inspection.
Inspect engine oil level and quality — low or dirty oil accelerates tensioner wear.

Where to look: Front of engine — timing chain tensioner and guide rail behind timing cover

Parts involved: Timing chain.

Ask the seller

“Has the timing chain or tensioner ever been inspected, and is there a service record of the work?”
“Does the engine produce a rattling sound on cold start that disappears after warm-up?”

03Diesel DPF Blockage and EGR Valve Fouling

Request a dealer scan to read DPF soot load percentage — above 75% indicates a problematic filter.diesel2009–2020EngineCan't confirm for this car$700–$4,000Read the full fault: symptoms, where to look, what to ask the seller

04A6GF1 Auto Torque Converter Judder at Highway Cruise

Perform an extended highway test drive holding steady cruise speed at 90-100 km/h with light throttle.petrol2015–2020TransmissionCan't confirm for this car$400–$4,000

OccasionalTransmission $400–$4,000 to fix

Can't confirm for this car

The A6GF1 6-speed automatic transmission fitted to petrol-engined UM Sorento models experiences torque converter lock-up clutch shudder during steady highway cruise, typically at 80-110 km/h with light throttle. The shudder originates from wear or contamination of the torque converter clutch friction material causing incomplete or oscillating lock-up engagement. The condition is frequently mistaken for engine vibration or wheel balance problems. Transmission fluid degradation significantly accelerates the fault. Kia issued technical service bulletins recommending ATF replacement using a specific friction-modified fluid as first remedy. Persistent shudder after correct fluid service indicates torque converter replacement is required.

A cutaway automatic transmission torque converter showing the internal turbine and stator. — A torque converter, sectioned. The lock-up clutch inside is what shudders.
No machine-readable author provided. BerndB~commonswiki assumed (based on copyright claims). · CC BY-SA 3.0 · Wikimedia Commons

Symptoms to notice

Rhythmic vibration or shudder felt through seat and floor at 80-110 km/h steady cruise
Shudder disappears immediately on slight acceleration or on lifting off throttle
Condition is worse when engine is fully warm and at normal operating temperature
Transmission fluid dark or smells burnt at inspection
Occasional transmission fault code relating to torque converter clutch engagement

What to check

Perform an extended highway test drive holding steady cruise speed at 90-100 km/h with light throttle.
Note whether a rhythmic shudder or vibration is felt through the floor and seat, and confirm it disappears when you accelerate or lift off.
Check automatic transmission fluid colour - it should be clear red, not dark or burnt smelling.
Scan for torque converter clutch fault codes.
Review ATF service history; shudder strongly correlates with degraded or incorrect fluid specification.

Where to look: A6GF1 automatic transmission - torque converter housing and lock-up clutch friction assembly

Parts involved: Torque converter.

Ask the seller

“Has a shudder or vibration at highway cruise speed between 80-110 km/h ever been noticed?”
“Has the automatic transmission fluid been changed, and with what fluid specification?”
“Has any torque converter work or transmission replacement been performed?”
“Is the vibration only present at certain steady speeds and light throttle, not under acceleration?”

05DPF regeneration problems and oil dilution on short-trip diesels (UM 2.2 CRDi)

Check the dipstick for an over-full or diesel-smelling reading.diesel2015–2020EngineCan't confirm for this car$400–$4,000

CommonEngine $400–$4,000 to fix

Can't confirm for this car

UM Sorento diesels used for short suburban trips fail to complete DPF regenerations, leading to blocked filters and diesel diluting the engine oil during repeated regen attempts. The oil level rises above max and loses its protective viscosity, accelerating engine and turbo wear. Hyundai-Kia diesels regenerate passively quite well on the open road, so usage pattern is everything - a motorway car is low risk, a school-run car is high risk.

Symptoms to notice

DPF warning light
Oil above the full mark or smelling of diesel
Limp mode / reduced power
Hot burning smell after short trips (active regen)

What to check

Check the dipstick for an over-full or diesel-smelling reading.
Ask about typical use.
A scan tool showing soot load and successful regen history is the definitive check.

Where to look: DPF in exhaust under the floor; engine oil sump

Parts involved: Diesel particulate filter.

Ask the seller

“What kind of driving does the car mostly do?”
“Has the DPF ever been forced-regenerated, cleaned or replaced?”

06Injector seal leaks on 2.2 CRDi (D4HB) - XM and UM

With the engine idling, listen at the top of the engine for chuffing and look for sooty deposits around the injector bases.diesel2009–2020EngineCan't confirm for this car$500–$3,000

OccasionalEngine $500–$3,000 to fix

Can't confirm for this car

The 2.2 R-series diesel in XM and UM Sorentos carries a milder version of the injector seat washer leak: combustion gas escapes past the copper washers, causing chuffing, exhaust smell and carbon build-up around the injectors. It is a routine but essential fix - if ignored the injectors carbon-lock into the head. Australian owners also report injectors failing rich (excess fuel delivery) on higher-km cars, showing as smoke and rough running.

Symptoms to notice

Chuffing noise from the top of the engine
Exhaust smell under the bonnet
Black deposits around injectors
Black smoke and uneven idle

What to check

With the engine idling, listen at the top of the engine for chuffing and look for sooty deposits around the injector bases. Ask for any injector or seal invoices, and when the last injector test was done.

Where to look: Injectors on top of the engine, under the plastic cover

Parts involved: Fuel injector.

Ask the seller

“Have the injector seals or injectors been replaced?”
“Does it blow black smoke under load?”

Fluid leaks1

01AWD Transfer Case Output Shaft Oil Seal Leak

2009–2020Fluid LeaksCan't confirm for this car$300–$1,200

OccasionalFluid Leaks $300–$1,200 to fix

Can't confirm for this car

The active AWD transfer case fitted to Sorento XM and UM develops oil seepage from the front and rear output shaft seals, particularly on higher-mileage examples. Seal degradation is accelerated by heat cycling and infrequent transfer case oil changes. A leaking transfer case can run low on lubricant, causing clutch pack wear inside the unit and eventual failure of the active torque-split mechanism, leaving the vehicle in front-wheel-drive only.

Symptoms to notice

Oil drips or wet patch under centre of vehicle near the transfer case
AWD warning light or traction control intervention on dry road
Vibration or shudder from drivetrain during cornering at low speed
Transfer case fluid level low on inspection

What to check

Place vehicle on a lift and inspect the transfer case body, front and rear output shaft seals, and driveshaft flange areas for oil weeping or dried oil residue.
Check transfer case fluid level and condition (should be clean and amber, not black or burnt smelling).
Review service records for transfer case oil changes — Kia recommends change at 40,000 km intervals for AWD models.

Where to look: Centre of underbody — transfer case unit behind transmission

Parts involved: Transfer case.

Ask the seller

“Has the transfer case oil been changed according to Kia's service schedule?”
“Have you noticed any oil drips under the vehicle or AWD warning light activations?”

Other Kia Sorento engines and years21 documented issues that do not apply to the one you picked.

Engine, transmission & cooling13

012.5T Smartstream Bearing Failure from Cold-Start Oil Starvation

Request full service history confirming oil changes at or before 10,000 km intervals using 0W-30 or 5W-30 fully synthetic oil to Kia specification.petrol2020 onwardEngineDoes not apply$6,000–$18,000

OccasionalEngine $6,000–$18,000 to fix

Does not apply

The 2.5L turbocharged Smartstream MPi engine (G4KH) in the MQ4 Sorento is subject to a known oil starvation issue on cold starts, where marginal oil pressure delivery to crankshaft and connecting rod bearings during initial crank allows momentary metal-to-metal contact. Repeated cold-start events accelerate bearing wear, leading to connecting rod bearing failure, spun bearings, and in severe cases catastrophic engine seizure. Consumer complaints and warranty claims across multiple markets document engine failures occurring within 40,000-80,000 km on vehicles with correct service history. Kia has investigated the lubrication delivery pathway on early-production MQ4 units. Strict adherence to 0W-30 specification oil and short oil change intervals is essential.

Symptoms to notice

Ticking or knocking noise from engine on cold start, fading as oil pressure builds
Oil pressure warning light illuminating briefly at initial cold start
Metallic debris or glittering particles visible in engine oil at service drain
Engine knock worsening under load after warm-up in advanced cases
Check engine light with cylinder misfire codes from mechanical bearing wear
Engine seizure with complete loss of power in catastrophic failure

What to check

Request full service history confirming oil changes at or before 10,000 km intervals using 0W-30 or 5W-30 fully synthetic oil to Kia specification.
Listen intently for engine knock or ticking on a cold start before the oil pressure builds - any metallic rattle in the first 5 seconds is a serious warning.
Check for any history of oil pressure warning light activation.
Inspect drained oil at service for metallic contamination or glitter.
Ask if any warranty claim for engine internal work has been lodged.

Where to look: Engine - connecting rod bearings, main bearings, crankshaft journals, lubrication oil galleries

Ask the seller

“Has the engine ever produced a knocking or ticking noise on cold start?”
“Have all oil changes been completed within 10,000 km intervals using correct 0W-30 specification oil?”
“Has the oil pressure warning light ever illuminated?”
“Has any engine internal work or engine replacement been carried out under warranty?”

02R2.2 CRDi Intake Manifold Swirl Flap Fragmentation

Look for plastic debris in the intake tract.diesel2020–2024EngineDoes not apply$800–$16,000

OccasionalEngine $800–$16,000 to fix

Does not apply

The R2.2 CRDi intake manifold contains variable swirl flaps mounted on a shared actuator shaft. The plastic/composite flap blades and actuator linkages are prone to cracking and detaching from the shaft, particularly in higher-mileage examples or where EGR carbon deposits accelerate wear. Broken fragments are drawn into the combustion chambers causing piston crown damage, valve damage, and in severe cases catastrophic engine failure requiring full rebuild or replacement. This failure mode is shared across the Hyundai-Kia R2.2 CRDi engine family and is extensively documented in TSBs and litigation in European and Australian markets.

Symptoms to notice

Rattling or ticking noise from intake manifold area at idle or under load
Sudden loss of engine power accompanied by loud mechanical knock
Engine management light with misfire or air-flow fault codes
Engine seizure or catastrophic internal noise on acceleration
Metallic particles visible in engine oil

What to check

Look for plastic debris in the intake tract.
Check for secure actuator rod attachment on all flaps — any play or rattle indicates imminent failure.
Inspect engine oil for metallic contamination.
If a workshop inspection is possible: Remove the intake manifold inlet pipe and use an endoscope to inspect the swirl flap assembly for cracked, missing, or loose flap blades.

Where to look: Intake manifold, lower left side of engine — swirl flap assembly is inside the manifold body near the cylinder head face

Parts involved: Intake manifold.

Ask the seller

“Has the intake manifold swirl flap assembly ever been inspected or replaced as a precautionary measure?”
“Has the vehicle experienced any sudden loss of power, loud knock, or engine warning light related to engine internals?”
“What is the service history, and has EGR carbon cleaning been carried out?”

03Theta II / Nu 2.4L Rod Bearing Oil Starvation Failure

Run VIN through Kia recall verification tool against NHTSA 17V-224 and ACCC recall PRA 2020/17268 for remedy completion.petrol2012–2014EngineDoes not apply$5,000–$14,000Read the full fault: symptoms, where to look, what to ask the seller

04High-pressure fuel pump failure contaminating the fuel system (XM 2.2 CRDi)

Check service history for regular fuel filter changes.diesel2009–2014EngineDoes not apply$1,500–$8,000

OccasionalEngine $1,500–$8,000 to fix

Does not apply

Australian XM Sorento owners report high-pressure fuel pump failures on the 2.2 diesel that, in the worst cases, spread metal filings through the fuel rail, lines and injectors - requiring replacement of the entire high-pressure fuel system at very high cost. Early symptoms are hard starting, loss of power and rail-pressure fault codes. Poor fuel quality and contaminated filters accelerate it, so a full fuel filter service history matters on these.

Symptoms to notice

Long cranking before starting
Loss of power / limp mode
Rail pressure fault codes
Metallic debris in the fuel filter

What to check

Check service history for regular fuel filter changes. Cold-start the engine - extended cranking is a warning. A pre-purchase diesel specialist inspection with a rail pressure test is worth the money on these.

Where to look: High-pressure fuel pump on the engine, fuel rail and lines on top of the engine

Parts involved: High-pressure fuel pump.

Ask the seller

“Has the high-pressure fuel pump ever been replaced?”
“How often were fuel filters changed?”
“Any history of hard starting?”

058DCT electric oil pump failure - total loss of drive (recall SC250 / AU 221135)

2020–2022TransmissionDoes not apply$0–$8,000

OccasionalTransmission $0–$8,000 to fix

Does not apply

MQ4 Sorentos with the 8-speed wet dual-clutch transmission were recalled because the transmission's electric oil pump circuit board can crack (insufficient soldering lets a component detach), throwing code P1C2D03 and then cutting drive completely 20-30 seconds after the warning appears. Kia Australia recalled 8572 cars (campaign 221135; US recall SC250, AU listing REC-005586); the fix is a software update, or full DCT assembly replacement if the fault code is stored. Confirm this recall is closed before buying any 2020-2022 MQ4.

Symptoms to notice

Check engine light with code P1C2D03
Warning followed by complete loss of drive within 30 seconds
Transmission fault messages on the dash

What to check

Check the VIN on vehiclerecalls.gov.au or with Kia NZ to confirm campaign completion, and ask whether the software update or a DCT replacement was performed. Any history of loss-of-drive events must be documented.

Where to look: Transmission electric oil pump, on the 8DCT gearbox under the car

Parts involved: Clutch.

Ask the seller

“Has recall 221135/SC250 been completed - update or full DCT replacement?”
“Has the car ever lost drive while moving?”

06D4CB 2.5 CRDi Timing Belt Failure (Interference Engine)

Demand proof of timing belt replacement with date and mileage.diesel2002–2009EngineDoes not apply$500–$700Read the full fault: symptoms, where to look, what to ask the seller

078DCT Dual-Clutch Transmission Clutch Shudder and Low-Speed Judder

Test-drive the vehicle in slow traffic or a car park.diesel2020–2024TransmissionDoes not apply$350–$5,500Read the full fault: symptoms, where to look, what to ask the seller

08R2.2 CRDi Diesel Particulate Filter Blockage

Check the dashboard for a DPF warning light (amber or red) or any existing fault codes related to exhaust backpressure or particulate filter load.diesel2020–2024EngineDoes not apply$600–$5,000

CommonEngine $600–$5,000 to fix

Does not apply

The R2.2 CRDi engine's diesel particulate filter (DPF) is prone to premature blockage in vehicles operated predominantly on short urban trips where exhaust temperatures do not reach the threshold required for passive regeneration. The DPF requires sustained highway driving at above 60 km/h to self-clean. When passive regeneration repeatedly fails, forced active regeneration is triggered but may also fail if the car is stopped mid-cycle. Progressive blockage reduces engine power, triggers limp mode, and ultimately requires professional DPF cleaning or replacement. Higher-mileage examples in urban markets or those towing regularly are most affected.

Symptoms to notice

DPF warning light illuminated on instrument cluster (amber or flashing)
Noticeable reduction in engine power, especially above 3,000 rpm
Vehicle enters limp mode with maximum speed restricted to 80-90 km/h
Increased fuel consumption as engine management compensates for backpressure
Failed forced regeneration cycle — engine warning light after attempted highway regeneration

What to check

Check the dashboard for a DPF warning light (amber or red) or any existing fault codes related to exhaust backpressure or particulate filter load.
Ask the owner about driving patterns — predominantly urban short trips are a strong risk indicator.
Request a scan tool reading of DPF soot load percentage and backpressure sensor values.
Inspect exhaust for excessive black soot around the tailpipe.

Where to look: Exhaust system — DPF canister mounted under the vehicle behind the catalytic converter, approximately beneath the front passenger footwell

Parts involved: Diesel particulate filter.

Ask the seller

“What is the typical daily driving pattern — predominantly short urban trips or regular highway driving?”
“Has a DPF warning light ever appeared, and if so, what was done to resolve it?”
“Has the DPF ever been professionally cleaned or replaced, and at what mileage?”

09HTRAC Rear AWD Coupling Unit Noise and Premature Wear

Drive at 80-100 km/h on a straight road and listen for a cyclic whine from the rear.2020–2024TransmissionDoes not apply$1,800–$5,000

OccasionalTransmission $1,800–$5,000 to fix

Does not apply

The HTRAC electronically-controlled rear AWD coupling unit, fitted across diesel, hybrid, and PHEV Sorento variants, has been reported to develop whining, grinding, or clunking noises from the rear driveline at highway speeds or during low-speed turning. The electro-hydraulic clutch pack inside the coupling wears prematurely when the coupling fluid is not serviced at the recommended interval or when the unit overheats during repeated off-road or towing use. In some cases the coupling fails entirely, reverting the vehicle to front-wheel drive and triggering an AWD malfunction warning. Coupling replacement or rebuild is expensive.

Symptoms to notice

Whining or howling noise from rear increasing with vehicle speed
Clunking from rear drivetrain during tight low-speed turns
AWD malfunction or traction control warning light
Vehicle pulls or vibrates at highway speed when AWD is engaged
Rear coupling unit hot to touch or showing fluid seepage after driving

What to check

Drive at 80-100 km/h on a straight road and listen for a cyclic whine from the rear.
Then perform slow tight turning manoeuvres in a car park and listen for clunking from the rear differential area.
Inspect the rear coupling unit for fluid leaks or heat discolouration.
Verify the HTRAC coupling fluid has been changed at or before 60,000 km as specified.

Where to look: Rear axle — HTRAC coupling unit mounted between propeller shaft and rear differential housing

Parts involved: Clutch.

Ask the seller

“Has the HTRAC rear coupling fluid ever been changed, and at what mileage?”
“Has any AWD warning light appeared, or has there been any whining or clunking noise from the rear of the vehicle?”
“Has the vehicle ever been used for towing or repeated off-road driving, which accelerates coupling wear?”

10Injector seal 'black death' on 2.5 CRDi (D4CB)

Remove or peer under the engine cover with the engine running: look for black crusty build-up around the four injectors and listen for chuffing.diesel2003–2009EngineDoes not apply$500–$3,000

CommonEngine $500–$3,000 to fix

Does not apply

The BL Sorento's 2.5 common-rail diesel is notorious for leaking injector seat washers: combustion gases escape past the seals and bake into hard black tar around the injectors ('black death'). You'll hear a chuffing noise and smell exhaust under the bonnet. Caught early it's a seals-and-clean job; left for years the injectors carbon-weld into the head and removal can require machining or head removal. Very well documented across Kia/Hyundai diesel forums for this engine.

Symptoms to notice

Rhythmic chuffing from the engine top
Exhaust smell under the bonnet or in the cabin
Black tar deposits around injectors
Hard starting

What to check

Remove or peer under the engine cover with the engine running: look for black crusty build-up around the four injectors and listen for chuffing.
Ask for invoices for injector seal work.

Where to look: Injectors on top of the engine, under the engine cover

Parts involved: Fuel injector.

Ask the seller

“Have the injector seals ever been done?”
“Has an injector ever been stuck or drilled out?”

11R2.2 CRDi EGR Cooler Coolant Leak

Check coolant reservoir level and inspect for unexplained loss.diesel2020–2024CoolingDoes not apply$900–$2,200Read the full fault: symptoms, where to look, what to ask the seller

12Crankshaft pulley / harmonic balancer failure (XM 2.2 CRDi)

With the engine idling and bonnet up, look at the crank pulley (bottom front of engine) with a torch - it should spin dead true.diesel2009–2014EngineDoes not apply$500–$1,500

OccasionalEngine $500–$1,500 to fix

Does not apply

The D4HB diesel's crank pulley (harmonic balancer) is a known weak point on XM Sorentos and related Hyundai models: the rubber-bonded damper delaminates or the pulley bolt loosens, causing a rattle or knock at idle, wobbling of the pulley and thrown drive belts. If the pulley lets go completely it can damage the crank snout - an engine-out repair. It's cheap insurance to inspect on any 2.2 diesel of this era.

Symptoms to notice

Rattle or knock from the front of the engine at idle
Visible wobble of the crank pulley with engine running
Squealing or thrown auxiliary belt
Rubber dust below the pulley

What to check

With the engine idling and bonnet up, look at the crank pulley (bottom front of engine) with a torch - it should spin dead true. Any wobble or separated rubber ring means it needs replacing. Check for belt dust on surrounding components.

Where to look: Crankshaft pulley, bottom front of the engine behind the drive belt

Parts involved: Shock absorber / strut.

Ask the seller

“Has the crank pulley or harmonic balancer been replaced?”
“Any front-of-engine rattles at idle?”

13Lambda 3.5 V6 Elevated Oil Consumption

Check engine oil level on dipstick and compare to known recent top-up date in service records.petrol2009–2014EngineDoes not apply$200–$4,000

OccasionalEngine $200–$4,000 to fix

Does not apply

The Lambda 3.5-litre V6 petrol engine in XM Sorento can develop above-normal oil consumption on higher-mileage examples, particularly where service intervals were extended or the engine ran hot. Worn piston rings allow oil to be burned in combustion, leading to blue smoke on acceleration and the need to top up oil between services. Kia's accepted consumption threshold was one litre per 1,000 km, which many owners found excessive.

Symptoms to notice

Blue-tinged smoke from exhaust on acceleration or engine braking
Oil level consistently dropping between services
Fouled spark plugs with oil deposits on electrode
Oily residue around exhaust tip

What to check

Check engine oil level on dipstick and compare to known recent top-up date in service records.
Look for blue smoke in the exhaust by revving the engine from idle with another person observing the exhaust pipe.
Remove spark plugs and inspect for oil fouling.
Ask owner how often they add oil between scheduled services.
If a workshop inspection is possible: Conduct a compression test if oil consumption is suspected.

Where to look: Engine — piston rings and valve stem seals, Lambda V6 block

Ask the seller

“How much oil, if any, do you add between scheduled oil changes?”
“Has any blue smoke ever been observed from the exhaust during normal driving?”

Electrical5

01XM Sorento ABS control unit fire risk recall when parked (2010-2012, REC-006104)

Ask for proof the HECU fire recall (REC-006104) was completed, or have a Kia dealer check the VIN before you buy.2010–2012ElectricalDoes not apply$0–$2,500

OccasionalElectrical $0–$2,500 to fix

Does not apply

On XM Sorento models from 2010 (all engines), the ABS and stability control unit (HECU) stays powered with the key off, and if moisture gets inside it can short circuit and start a fire in the engine bay while the car is parked. Kia Australia recalled this in October 2024 (REC-006104) as part of a recall of over 100,000 Kias, and advised owners not to park in a garage or near anything flammable until fixed. The dealer inspection and repair is free. One press report quoted 2010 to 2014 Sorentos, so check any XM by VIN.

Symptoms to notice

ABS, traction control or stability warning light on
Burning smell or scorch marks around the ABS unit in the engine bay

What to check

Ask for proof the HECU fire recall (REC-006104) was completed, or have a Kia dealer check the VIN before you buy.
With the bonnet open, use a torch to look at the ABS unit (the metal block with brake pipes on the driver side of the engine bay) for melted plastic, scorch marks or corrosion on the plug.
Check that the ABS and stability warning lights go out after start-up.

Where to look: ABS/ESC hydraulic control unit in the engine bay, where the brake lines meet

Ask the seller

“Has the ABS control unit fire recall been done, and do you have the paperwork?”
“Has the car ever had an ABS or stability light on?”
“Has it been parked in a garage while the recall was outstanding?”

02PHEV High-Voltage Battery Coolant Pump Failure

Listen for the electric coolant pump running when the vehicle is switched on — absence of pump noise is a red flag.hybrid2021–2024ElectricalDoes not apply$900–$2,800

OccasionalElectrical $900–$2,800 to fix

Does not apply

The 1.6T PHEV variant uses an electric coolant pump to manage thermal conditions of the high-voltage lithium-ion battery pack. The pump motor bearings and impeller have been reported to fail prematurely, causing loss of active battery cooling. Without adequate cooling, the battery management system (BMS) reduces available charge/discharge power and can lock out fast charging. In warmer climates (Australia) thermal stress accelerates the failure. Kia issued a service campaign in some markets for pump inspection. Failure leaves the vehicle driveable but degrades electric range and charging performance until repaired.

Symptoms to notice

EV/hybrid system warning light with battery temperature fault codes
Reduced electric-only driving range, especially in warm ambient temperatures
AC fast-charge speed reduced or charging limited to slow charge only
Audible absence of electric pump whirr from beneath rear floor when car is powered on
BMS fault codes related to battery coolant flow rate or temperature out-of-range

What to check

Listen for the electric coolant pump running when the vehicle is switched on — absence of pump noise is a red flag.
Check the coolant level in the HV battery cooling reservoir (separate from engine coolant).
Inspect pump wiring harness connector for corrosion.
If a workshop inspection is possible: Connect a scan tool and check for BMS fault codes related to battery cooling circuit flow or temperature differential.

Where to look: High-voltage battery cooling circuit — pump unit mounted under the rear cargo floor area near the HV battery pack

Parts involved: Water pump.

Ask the seller

“Has the high-voltage battery cooling pump ever been inspected or replaced, and has any battery temperature warning appeared on the dash?”
“Has the PHEV's electric charging speed or range changed noticeably since purchase?”
“Is the vehicle eligible for any open Kia service campaigns related to the high-voltage battery cooling system?”

03Crankshaft position sensor failure - stalling and no-start (BL)

Take a long test drive including stop-start running until fully hot.2003–2009ElectricalDoes not apply$250–$700

CommonElectrical $250–$700 to fix

Does not apply

BL Sorentos are known for crank angle sensor failures that cause sudden stalling, intermittent cutting out when hot, and no-start conditions that mimic fuel or immobiliser problems. It's a cheap sensor but the intermittent nature means many cars get expensive parts thrown at them first. Australian owner forums and CarsGuide problem pages list it as a signature BL fault on both petrol and diesel.

Symptoms to notice

Engine cuts out while driving, restarts after cooling
Intermittent no-start with no warning lights
Tacho drops to zero momentarily before stalling

What to check

Take a long test drive including stop-start running until fully hot.
Ask directly whether the car has ever cut out.
Check for a recent crank sensor invoice - if it was replaced with a genuine part, that's a positive.

Where to look: Crankshaft position sensor, lower front/side of the engine block

Ask the seller

“Has it ever stalled or refused to start when hot?”
“Has the crank angle sensor been replaced?”

04XM Sorento door trim light wiring short circuit recall (built Sept 2009 to June 2010, PRA 2010/11978)

Open each door at night or in shade and check the door trim lights work.2009–2010ElectricalDoes not apply$0–$600

OccasionalElectrical $0–$600 to fix

Does not apply

On XM Sorento models built between September 2009 and June 2010 (all engines), the wiring that feeds the door trim illumination lights can short circuit and cause heat damage inside the door. Kia Australia recalled these cars in September 2010 (PRA 2010/11978) and the dealer fix was free. Most cars will have been fixed long ago, but an imported or unserviced car may not have been.

Symptoms to notice

Door trim lights not working or flickering
Burning smell or melted plastic near a door trim panel

What to check

Open each door at night or in shade and check the door trim lights work.
Look and smell for scorched or melted plastic around the trim panels.
Ask for proof the 2010 door wiring recall was done or have a Kia dealer check the VIN.

Where to look: Inside the door trim panels, illumination wiring

Ask the seller

“Was the 2010 door wiring recall done on this car?”
“Have any door trim lights stopped working?”

0512V battery drain when parked (MQ4)

Ask when the battery was last replaced and whether the car has ever needed a jump start.2020 onwardElectricalDoes not apply$150–$600

OccasionalElectrical $150–$600 to fix

Does not apply

MQ4 Sorento owners report flat 12V batteries after the car sits for a week or less, traced variously to the power tailgate module, telematics units and infotainment not sleeping properly. Kia has issued software updates for several drain sources. It is inconvenient rather than dangerous, but repeated deep discharges kill batteries early and can cause a cascade of electronic warning messages.

Symptoms to notice

Flat battery after the car sits for days
Multiple warning messages after a jump start
Battery replaced more than once in a young car

What to check

Ask when the battery was last replaced and whether the car has ever needed a jump start.
Check the service history for battery-drain diagnostic visits or module software updates.

Where to look: 12V battery in engine bay; body control and tailgate modules

Parts involved: 12V battery.

Ask the seller

“Has the car ever gone flat while parked?”
“Have any parasitic-drain software updates been done?”

Body, brakes, suspension & interior2

01Front Lower Control Arm Ball Joint Wear

Inspect rubber dust boot for cracks or tears that allow contamination.2002–2009SuspensionDoes not apply$350–$750

CommonSuspension $350–$750 to fix

Does not apply

BL Sorento front lower control arm ball joints wear prematurely, compounded by the vehicle's heavy kerb weight and NZ/AU road conditions. Worn joints produce clunking over bumps and loss of steering precision. Severely worn joints risk separation causing sudden wheel collapse. The boot seal failure allows water and grit ingress accelerating joint wear.

Symptoms to notice

Clunking or knocking from front suspension over potholes or turning
Steering wander or pulling requiring constant correction
Uneven front tyre wear indicating geometry shift

What to check

Inspect rubber dust boot for cracks or tears that allow contamination. Worn boots without play indicate replacement is imminent. Check for alignment drift consistent with joint wear. If a workshop inspection is possible: On hoist, check each ball joint for vertical play by rocking the wheel.

Where to look: Front lower control arm inner pivot and outer ball joint, both sides

Parts involved: Ball joint.

Ask the seller

“Have the front ball joints or control arms been replaced?”
“Does the car clunk over bumps or corners?”
“Has a wheel alignment been done recently?”

024WD engagement failures - transfer case actuator and front hub issues (BL)

On gravel or grass, engage 4WD and confirm the light comes on solid, then do a tight-lock turn - you should feel driveline bind.2003–2009SuspensionDoes not apply$400–$1,800

CommonSuspension $400–$1,800 to fix

Does not apply

The body-on-frame BL Sorento's electronically engaged 4WD system commonly stops engaging: the transfer case shift motor/actuator seizes, the 4WD switch or control module fails, or the front axle disconnect plays up. Many NZ examples have quietly been running as 2WD-only for years. On a vehicle bought for towing or off-road use this matters, and actuator or transfer case repairs are not trivial. Check the underbody for rust on these older ladder-frame vehicles at the same time.

Symptoms to notice

4WD light flashing or not illuminating when selected
Clunks when engaging 4WD
No drive to front wheels on loose surfaces

What to check

On gravel or grass, engage 4WD and confirm the light comes on solid, then do a tight-lock turn - you should feel driveline bind. While underneath, check the ladder frame and crossmembers for rust scale.

Where to look: Transfer case behind the gearbox, front differential and hubs, underbody frame

Parts involved: Transfer case.

Ask the seller

“Does the 4WD actually engage - can you show me?”
“Has the transfer case actuator been replaced?”

Fluid leaks1

01Fuel feed hose leak, fire risk recall (2.2 R CRDi D4HB diesel, 2011 XM Sorento, PRA 2017/16224)

diesel2011Fluid LeaksDoes not apply$0–$500

OccasionalFluid Leaks $0–$500 to fix

Does not apply

On 2011 XM Sorentos with the Euro 5 2.2 (and 2.0) R CRDi diesel, the rubber fuel feed hose can lose its strength and oil resistance early and start leaking diesel, which is a fire risk. Kia Australia recalled these cars in August 2017 (PRA 2017/16224), and a Kia service bulletin (KCE13-14-P160) also covers hose replacement on cars built from late August to late December 2011. The dealer fix is free.

Symptoms to notice

Smell of diesel in or around the car
Wet diesel residue on top of the engine near the fuel lines

What to check

Open the bonnet and use a torch to look along the fuel lines on top of the engine for wet, oily diesel or a fresh diesel smell, especially after the test drive.
Ask for proof the 2017 fuel feed hose recall was done or have a Kia dealer check the VIN.

Where to look: Engine bay, low-pressure fuel feed hose to the high-pressure pump

Ask the seller

“Has the fuel hose recall been done?”
“Have you ever smelt diesel in the cabin or after parking?”

Kia Sorento faults in detail

Narrowed to the Kia Sorento · 2016. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

Diesel DPF Blockage and EGR Valve FoulingMajor · Engine

What these repairs cost on other cars

Some of the Kia Sorento’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Buying guides that cover the Kia Sorento

Other Kia models

Kia Sportage28 documented faults Kia Rio23 documented faults Kia Carnival17 documented faults Kia Cerato17 documented faults Kia Stinger16 documented faults Kia Pride14 documented faults

Kia Sorento buyer questions

Is the Kia Sorento reliable?

Like any used car, it depends on the specific example and its service history. Across the 29 documented faults for the Kia Sorento, the recurring problem areas are engine, transmission, and electrical. A Kia Sorento with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Kia Sorento?

We've catalogued 29 known faults for the Kia Sorento, covering engine, transmission, and electrical. All 29 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Kia Sorento?

Most single repairs on the Kia Sorento fall between $500–$4,000 at NZ independent-workshop rates. Some of the 29 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Kia Sorento?

Yes. A Kia Sorento inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.