Skip to content
KickTyres
Mercedes-Benz2015–2023 Critical issues documented

Mercedes-Benz GLC: common faults & what to check

Thinking about buying a used Mercedes-Benz GLC (2015–2023) in New Zealand? We've documented 17 known faults for this model spanning engine, suspension, transmission, and electrical. Each researched and verified before it's published. The most serious issues here are rated critical. Every one is listed below with its symptoms and repair cost, and each has its own page with where to look and what to ask the seller. Free, no account needed.

Check this exact Mercedes-Benz GLC

  • Odometer history
  • Money owing
  • Reported stolen
  • Ownership history
  • Official NZ vehicle register data
  • NZ owned and operated

Type the plate for the free basics. The full record is a paid check from $13.49, one car at a time, no subscription.

No NZ plate yet, or buying in Australia? Pick the generation and engine and start a free check below. New to KickTyres? How the check works →

17

Documented faults

Critical

Most serious

$1,200–$6,000

Typical repair

7

Systems covered

Which Mercedes-Benz GLC are you looking at?

4 generation variants documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

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.

Start your free check on this Mercedes-Benz GLC

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

Mercedes-Benz GLCEngine not picked yet

Pick the engine above first: the GLC came with 4, and without it the report has to show all of their faults. Pick the engine

Free. The paid plate check is separate, and stays optional.

Can't confirm for this car

Mercedes-Benz GLC

Nothing has been narrowed yet, so nothing below is a claim about a particular car. Pick a year and an engine to see which faults apply.

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

matched on no vehicle context

What to look out for

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

  • Serious issue

    Cold-start the engine and listen at the firewall for a sustained rear-engine rattle before warming.

    See why

    OM651 2.1CDi Timing Chain and Guide Failure

    GLC 220d and 250d models produced from 2015 to the 2018 model-year facelift carried the OM651 2.1-litre diesel engine, which shares the same rear-mounted timing chain design weakness found across the wider OM651 family. Nylon-composite chain guides degrade under heat and oil contamination, and the hydraulic tensioner cannot maintain adequate chain tension during cold starts when oil pressure has not yet fully built. Chain jump across camshaft sprocket teeth creates immediate risk of valve-to-piston contact and catastrophic internal damage. The OM651 was replaced by the OM654 2.0-litre diesel during the 2018 GLC facelift.

    What you would notice

    • Cold-start metallic rattle from the rear of the engine settling after two to three minutes
    • Engine warning light with timing or camshaft fault codes P0016 or P0017
    • Hunting or unsteady idle during the first minutes of running from cold
    • Increased oil consumption as degraded guide material contaminates the sump

    Typically $3,500–$8,500 to put right.

  • Costly issue

    Start engine from fully cold soak and listen for timing chain rattle at front of engine near cam cover.

    See why

    M264 timing chain tensioner cold-start rattle

    The M264 2.0T engine uses a hydraulic timing chain tensioner that relies on residual oil pressure to maintain chain tension on cold starts. Oil drain-back in the tensioner bore after shutdown allows momentary chain slack when the engine is first cranked in cold conditions. This produces a characteristic metallic rattle from the front of the engine lasting two to fifteen seconds until oil pressure is re-established. Repeated slack events accelerate wear on the plastic chain guide rails; when a guide fractures, chain jump and valve-to-piston contact become possible. The fault is documented across multiple M264 applications including A-Class, C-Class, and GLC from build dates late 2018 onward.

    What you would notice

    • Metallic rattling from engine front on cold start, disappears within 5-15 seconds
    • Check engine light with camshaft position/timing correlation codes P0008 or P0016
    • Rough idle briefly after cold start
    • In advanced cases, persistent rattle at operating temperature indicating guide failure

    Typically $3,200–$6,500 to put right.

  • Costly issue

    Cold-start the engine first thing and listen immediately for chain rattle from the timing cover.

    See why

    GLC M274 2.0T Timing Chain Cold-Start Rattle and Guide Wear

    The M274 2.0-litre turbocharged petrol engine in the GLC exhibits timing chain rattle on cold start caused by tensioner response lag and progressively worn chain guide rails. The plastic guide material cracks and sheds into the oil. Left unaddressed, chain stretch leads to valve timing errors and engine damage. Vehicles with extended oil service intervals or low-grade oil are at significantly higher risk.

    What you would notice

    • Rattling from front of engine on cold start that fades within 30 to 60 seconds
    • Camshaft position correlation fault codes (P0340, P0341, P0365, P0366)
    • Rough idle when cold
    • Plastic debris visible on dipstick or in oil filter

    Typically $2,500–$6,000 to put right.

  • Costly issue

    Scan for P20EE, P203F, P2BAD codes.

    See why

    AdBlue SCR dosing injector clogging

    The OM654 2.0D SCR system uses a urea dosing injector mounted in the exhaust pipe upstream of the NOx reduction catalyst. In cold NZ winters, incomplete AdBlue evaporation causes urea crystals to accumulate on the injector tip and catalyst face. At low annual mileage the system does not reach self-cleaning temperature cycles often enough to prevent build-up. Crystals block the spray pattern, trigger P20EE or P203F fault codes, and eventually force a countdown to engine start lock-out after a set number of restart cycles if unresolved.

    What you would notice

    • AdBlue warning lamp illuminated with countdown (e.g. '1000 km until engine start prevented')
    • NOx catalyst efficiency fault codes P20EE or P203F stored
    • Reduced engine output or limp mode in advanced cases
    • Visible white crystalline deposit around exhaust tip near injector

    Typically $1,100–$2,800 to put right.

  • Costly issue

    Scan ECU for P0A9A, P2591, or manufacturer-specific electric water pump fault codes.

    See why

    M264 auxiliary electric coolant pump failure

    The M264 2.0T engine uses an electric auxiliary coolant pump to circulate coolant through the turbocharger and engine after hot shutdown, preventing heat soak damage, and to support the main water pump during peak load. The electric pump uses brushless motor technology but the impeller and motor winding are prone to premature failure, particularly in vehicles that frequently cycle through hot-shutdown events such as urban stop-start driving. Failure is typically electronic: the pump motor windings fail causing the ECU to log a coolant pump fault and illuminate the engine warning light or overtemperature warning. In some cases the pump seizes, causing localised coolant flow restriction and triggering an overtemperature event that forces engine power reduction to protect head gasket integrity.

    What you would notice

    • Engine coolant temperature warning light or overtemperature message on cluster
    • P0A9A or similar electric coolant pump fault codes stored
    • Engine power reduction warning linked to overtemperature protection mode
    • Coolant pump running audibly after hot shutdown then stopping prematurely
    • In failed cases: pump completely silent during post-run cycle

    Typically $650–$1,600 to put right.

  • Costly issue

    Cold-start and listen for chain rattle at the front of the engine.

    See why

    OM654 2.0CDi Timing Chain Guide Cracking and Turbo Failure

    The OM654 2.0-litre diesel introduced into the GLC during the 2018 facelift is more refined than the OM651 it replaced but shares a similar susceptibility to plastic timing chain guide cracking under heat exposure and age. Once a guide fractures the chain can derail, causing bent valves. The OM654 also exhibits turbocharger failures manifesting as power loss and unusual induction noise, and rocker arm and camshaft wear has been observed in earlier production batches. Oil consumption issues without prior warning have been reported in some units. Later production from 2021 onwards incorporates revised component materials that improve longevity.

    What you would notice

    • Cold-start timing chain rattle from front of engine that persists beyond warm-up
    • Sudden or progressive loss of power with possible induction whistle from failing turbo
    • Oil pressure warning or unexplained oil consumption without visible external leak
    • Check engine light with camshaft position or boost-related fault codes

    Typically $2,500–$9,000 to put right.

See all 17 documented issuesEverything researched for the Mercedes-Benz GLC, including 2 rated critical.
Depends on which engine this Mercedes-Benz GLC has — 17Each of these is documented for one particular engine. Pick the year and engine above to see which of them apply.
Engine, transmission & cooling12

01OM651 Balance Shaft Chain and Oil Pump Drive Failure

diesel2015–2019Engine
OccasionalEngine $3,500–$12,000 to fix

Can't confirm for this car

The OM651 2.2-litre CDI diesel engine used in GLC220d and GLC250d variants has a documented weakness in the balance shaft chain and oil pump drive chain system. The balance shaft chain can stretch, wear, or fail prematurely due to insufficient lubrication and chain tensioner design limitations. In severe cases the chain can jump or break, destroying the balance shaft module and causing oil pump drive failure. Loss of oil pressure following pump drive failure rapidly leads to catastrophic main bearing and crankshaft damage requiring full engine replacement. The failure is often preceded by a low-pitched rumbling distinct from normal diesel clatter, audible at idle from the lower engine.

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

Symptoms to notice

  • Rattling or rumbling from lower engine at idle especially when warm
  • Oil pressure warning light activating
  • Increased engine vibration at idle from failing balance shaft
  • Metal particles in engine oil detected at service
  • Engine knock or sudden power loss in catastrophic terminal failure

What to check

  1. Start the engine and listen carefully for lower engine noise at idle that is distinct from normal diesel clatter - any unusual rumbling warrants immediate investigation.
  2. Request full service history and verify oil change intervals under 10,000km.
  3. Ask specifically if balance shaft or lower engine work has been completed.
  4. Scan for fault codes related to oil pressure or balance shaft timing correlation.
  5. If a workshop inspection is possible: Check oil level and condition; a drain-plug magnet or oil analysis will reveal metal particles in failing engines.

Where to look: Lower engine block, balance shaft module, oil pump drive chain assembly in sump area

Parts involved: Timing chain.

Ask the seller

  • “Has the balance shaft chain or oil pump drive been inspected or replaced?”
  • “Is there any record of lower engine noise or oil pressure warnings?”
  • “Can you provide full oil change service history with dates and odometer readings?”
  • “Has the engine oil ever shown metal contamination or been analysed?”

02OM651 2.1CDi Timing Chain and Guide Failure

Cold-start the engine and listen at the firewall for a sustained rear-engine rattle before warming.diesel2015–2018EngineRead the full fault: symptoms, where to look, what to ask the seller

03OM654 2.0CDi Timing Chain Guide Cracking and Turbo Failure

Cold-start and listen for chain rattle at the front of the engine.diesel2018 onwardEngine
OccasionalEngine $2,500–$9,000 to fix

Can't confirm for this car

The OM654 2.0-litre diesel introduced into the GLC during the 2018 facelift is more refined than the OM651 it replaced but shares a similar susceptibility to plastic timing chain guide cracking under heat exposure and age. Once a guide fractures the chain can derail, causing bent valves. The OM654 also exhibits turbocharger failures manifesting as power loss and unusual induction noise, and rocker arm and camshaft wear has been observed in earlier production batches. Oil consumption issues without prior warning have been reported in some units. Later production from 2021 onwards incorporates revised component materials that improve longevity.

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

Symptoms to notice

  • Cold-start timing chain rattle from front of engine that persists beyond warm-up
  • Sudden or progressive loss of power with possible induction whistle from failing turbo
  • Oil pressure warning or unexplained oil consumption without visible external leak
  • Check engine light with camshaft position or boost-related fault codes

What to check

  1. Cold-start and listen for chain rattle at the front of the engine.
  2. During the test drive accelerate firmly through the mid-range and note any flat spot or whistling from the turbocharger.
  3. Check oil level and confirm it matches service records.
  4. Request STAR diagnostic scan for timing, boost, and camshaft fault codes.
  5. Confirm full oil service history at or below 15,000 km intervals.

Where to look: Front of engine block (timing chain), turbocharger mounted on exhaust manifold

Parts involved: Timing chain, Turbocharger.

Ask the seller

  • “Has the turbocharger, timing chain, or camshaft components been inspected or replaced?”
  • “Has the engine ever lost power unexpectedly or shown an oil pressure warning?”
  • “Are there complete oil service records for the full ownership history?”

04M264 timing chain tensioner cold-start rattle

Start engine from fully cold soak and listen for timing chain rattle at front of engine near cam cover.petrol2018–2023EngineRead the full fault: symptoms, where to look, what to ask the seller

05GLC M274 2.0T Timing Chain Cold-Start Rattle and Guide Wear

Cold-start the engine first thing and listen immediately for chain rattle from the timing cover.petrol2015 onwardEngineRead the full fault: symptoms, where to look, what to ask the seller

064MATIC Rear Diff Coupling Heat Damage on Long Grades

Ask about vehicle usage history particularly towing, mountain driving, or use in hilly NZ regions such as the Central Plateau or Southern Alps.2015 onwardTransmission
OccasionalTransmission $2,500–$6,000 to fix

Can't confirm for this car

The electronically controlled rear differential coupling unit on 4MATIC GLC X253 models can suffer heat damage when the vehicle is operated under sustained load on long grades such as towing on mountain passes or repeated hill starts. The coupling modulates torque to the rear axle using a multi-plate wet clutch pack and electronic actuator. Sustained clutch engagement at partial slip generates heat that degrades the internal coupling fluid and can warp or damage the clutch plates. Affected units exhibit a burning smell from underneath the vehicle, rear drivetrain shudder during cornering, and eventual 4MATIC system faults. The coupling unit is a sealed replacement-only part and cannot be rebuilt at specialist level in NZ.

Symptoms to notice

  • Burning or overheated smell from rear underside during or after sustained hill driving
  • Rear driveline shudder or vibration during tight cornering manoeuvres
  • 4MATIC warning light or drivetrain fault message on instrument cluster
  • Rear axle coupling producing grinding or clicking noise
  • Loss of all-wheel drive function defaulting to front-wheel drive only

What to check

  1. Ask about vehicle usage history particularly towing, mountain driving, or use in hilly NZ regions such as the Central Plateau or Southern Alps.
  2. Check for any 4MATIC fault codes in the vehicle history.
  3. During test drive perform low-speed tight turns in a car park and listen for rear driveline noise or shudder.
  4. Inspect the underside for heat discoloration around the rear differential coupling unit.
  5. If a tow bar is fitted the risk of coupling heat damage is significantly higher.

Where to look: Rear differential coupling unit, rear axle assembly, rear propshaft connection

Parts involved: Differential.

Ask the seller

  • “Has the vehicle been used for towing and if so what maximum load?”
  • “Has the vehicle been used regularly on steep grades or mountain roads?”
  • “Have there been any 4MATIC warning lights or all-wheel drive system faults?”
  • “Has the rear differential coupling been inspected or replaced?”

079G-Tronic mechatronic shudder and harsh shifts (X253)

Hold a light steady throttle around town and on the motorway and feel for a shudder that comes and goes.2015–2022Transmission
OccasionalTransmission $1,200–$6,000 to fix

Can't confirm for this car

The X253 GLC's 9-speed 9G-Tronic automatic can develop mechatronic/valve-body wear giving a shudder or vibration at light throttle, harsh or hunting shifts and occasional fault codes. Many cases respond to a fluid service and software update, but a failed mechatronic unit is a major bill. The 'lifetime' fluid really should be changed around 100,000 km.

Symptoms to notice

  • Shudder or vibration at light steady throttle
  • Harsh, hunting or delayed shifts
  • Torque-converter judder at moderate speed
  • Transmission warning / stored codes

What to check

Hold a light steady throttle around town and on the motorway and feel for a shudder that comes and goes. Ask for transmission service history and whether gearbox software updates were done. Any limp-mode event is a red flag.

Where to look: 9-speed automatic transmission - mechatronic/valve body and torque converter

Parts involved: Mechatronic / valve body.

Ask the seller

  • “Has the transmission fluid been changed and updates applied?”
  • “Any shudder at steady throttle or limp-mode events?”

084MATIC PTU Rear Seal and Bearing Failure

The Power Transfer Unit on 4MATIC all-wheel-drive GLC X253 models is prone to rear output shaft seal failure and internal bearing wear.2015 onwardTransmission
OccasionalTransmission $800–$4,500 to fix

Can't confirm for this car

The Power Transfer Unit on 4MATIC all-wheel-drive GLC X253 models is prone to rear output shaft seal failure and internal bearing wear. The PTU transfers drive to the rear axle and is a sealed unit with finite oil capacity. When the output shaft seals leak, PTU oil level drops and the unit runs in a degraded lubrication state, accelerating internal bearing and helical gear wear. The condition is commonly not caught until significant damage has occurred because the PTU has no dipstick and carries no defined service interval in many NZ and AU service schedules. Failure results in a whining or humming noise from the driveline and eventual 4MATIC system faults requiring full PTU replacement.

Symptoms to notice

  • Whining or humming noise from drivetrain that increases with vehicle speed
  • Oil leak from PTU output shaft seal area visible on underside
  • Vibration or shudder from driveline at highway speed
  • 4MATIC warning light or all-wheel drive fault message on instrument cluster
  • Driveline noise that changes during cornering

What to check

With vehicle raised, inspect the PTU located at the centre of the vehicle behind the transmission on 4MATIC models for any oil seepage or active leaking at the output shaft seals. Check for oil staining on the underside chassis rails and driveshaft area. During road test listen for whining or humming from the drivetrain at highway speed. Ask about any 4MATIC or drivetrain warning messages. Some NZ dealers now include PTU oil inspection in extended services.

Where to look: Power Transfer Unit, underside centre of vehicle between transmission output and rear propshaft

Parts involved: Transfer case.

Ask the seller

  • “Has the PTU been inspected for oil leaks or bearing noise?”
  • “Has PTU oil ever been changed or the unit topped up?”
  • “Have there been any 4MATIC system or drivetrain warning messages?”
  • “Is there any whining noise from the drivetrain at highway speed?”

09OM654 EGR cooler water jacket seal failure

Check coolant level and top-up history records.diesel2019–2023Cooling
OccasionalCooling $1,800–$4,200 to fix

Can't confirm for this car

The OM654 EGR cooler uses a stainless-steel tube bundle surrounded by engine coolant to reduce recirculated exhaust gas temperature before it re-enters the intake manifold. Internal seal and gasket failures between the coolant jacket and the exhaust gas passages allow coolant to enter the EGR gas path and be ingested into the engine. The first sign is typically white steam-like exhaust smoke on light load and a persistent drop in coolant level with no external puddle visible. As coolant ingestion continues, combustion chamber contamination can lead to hydro-lock risk and catalytic converter damage. External coolant weeping from the cooler body is also observed in some failure modes. Mercedes-Benz issued technical guidance for this failure pattern on OM654 engines from 2018 onward.

Symptoms to notice

  • Persistent coolant level drop with no visible external puddle
  • White exhaust smoke under light throttle or on overrun
  • Sweet or unusual smell from exhaust
  • Coolant contamination residue visible in EGR pipe or intake manifold
  • Possible overheating if coolant loss becomes significant

What to check

  1. Check coolant level and top-up history records.
  2. Inspect EGR cooler body and hose connections for external weeping or staining.
  3. Remove EGR pipe downstream of cooler and inspect for moisture or white deposits.
  4. Check combustion gases in coolant with combustion leak test kit (CO sniff test).
  5. Inspect intercooler for emulsification suggesting coolant ingestion.
  6. If a workshop inspection is possible: Pressure-test cooling system to identify drop indicating internal leak.

Where to look: EGR cooler: mounted on rear/side of OM654 cylinder block, connected to EGR valve and intake manifold, with coolant hoses from main circuit

Parts involved: EGR valve.

Ask the seller

  • “Has the coolant level required topping up at any point, and if so how often?”
  • “Has there been any white smoke from the exhaust that was investigated?”
  • “Has the EGR cooler or EGR valve ever been replaced or serviced?”
  • “Are there any fault codes related to EGR system or coolant temperature sensor?”

10OM651/OM654 diesel emissions and coolant-related recalls (X253)

Check the dash for any emissions, AdBlue or DPF warnings on start-up and after a drive.diesel2015–2022Engine
OccasionalEngine $600–$4,000 to fix

Can't confirm for this car

GLC diesels were caught up in Europe-wide emissions actions and a broad coolant-pump/thermostat campaign that, in a worst case, was linked to a fire risk. Related issues on these engines are EGR clogging, AdBlue/SCR faults and DPF regeneration problems, especially on short-trip cars. None are cheap if they turn into hardware, and warning lights can be an instant WoF/registration headache. Confirm recalls are done and there are no live emission warnings.

Symptoms to notice

  • AdBlue/SCR or emissions warning light
  • DPF or 'reduced emissions' warning
  • Rough running or limp mode
  • Coolant warning / outstanding recall

What to check

  1. Check the dash for any emissions, AdBlue or DPF warnings on start-up and after a drive.
  2. Ask for proof emissions and coolant-related recalls have been done.
  3. A diesel used only for short town trips is more likely to have EGR/DPF trouble.

Where to look: Engine emissions system - EGR, DPF, SCR/AdBlue; coolant pump/thermostat

Parts involved: Water pump, Thermostat, Diesel particulate filter.

Ask the seller

  • “Have the emissions and coolant recalls been completed?”
  • “Any AdBlue, DPF or emissions warnings, ever?”

11AdBlue SCR dosing injector clogging

Scan for P20EE, P203F, P2BAD codes.diesel2015–2023EngineRead the full fault: symptoms, where to look, what to ask the seller

12M264 auxiliary electric coolant pump failure

Scan ECU for P0A9A, P2591, or manufacturer-specific electric water pump fault codes.petrol2018–2023CoolingRead the full fault: symptoms, where to look, what to ask the seller
Electrical2

0148V mild-hybrid (ISG) battery and system faults (X254)

Let stop-start cycle at lights and feel for rough restarts.hybrid2023 onwardElectrical
OccasionalElectrical $800–$6,000 to fix

Can't confirm for this car

The current GLC uses a 2.0 turbo with a 48-volt mild-hybrid integrated starter-generator (ISG). Across Mercedes' 48V range, the 48V battery, the ISG unit and the DC/DC converter are known weak points that trigger '48V onboard electrical' or hybrid warnings and cause rough auto-restarts; many are software-fixable but persistent faults mean costly hardware. As a young model there is limited used data, so treat any electrical warning seriously and confirm software/recalls are current.

Symptoms to notice

  • '48V onboard electrical system' or hybrid warning
  • Rough or hesitant engine auto-restart at lights
  • Reduced power / stop-start not working

What to check

  1. Let stop-start cycle at lights and feel for rough restarts.
  2. Check no 48V/hybrid warning is present on start-up or after driving.
  3. Ask whether all software updates and any 48V-related recalls have been done.

Where to look: 48V battery and integrated starter-generator on the engine/transmission

Parts involved: Starter motor, Turbocharger.

Ask the seller

  • “Has a 48V or hybrid-system warning ever appeared?”
  • “Are all software updates and recalls up to date?”

02MBUX infotainment freezes and camera dropouts (X254)

Work through the MBUX menus, pair a phone, and check the cameras respond when reversing.2023 onwardElectrical
OccasionalElectrical $300–$3,500 to fix

Can't confirm for this car

The X254's large portrait MBUX screen can freeze, reboot or drop CarPlay/Android Auto and the 360-degree camera. Usually a software update resolves it, but confirm everything works because the head unit is expensive. As a new used model, check the car has had its updates applied.

Symptoms to notice

  • Central screen freezes or reboots
  • CarPlay/Android Auto dropouts
  • 360/reversing camera blank or laggy

What to check

Work through the MBUX menus, pair a phone, and check the cameras respond when reversing. Ask whether the latest software has been installed.

Where to look: Dashboard portrait MBUX display and head unit

Ask the seller

  • “Does the screen ever freeze or restart?”
  • “Are the infotainment updates current?”
Body, brakes, suspension & interior3

01AIRMATIC Air Suspension Compressor and Strut Failure

Optional AIRMATIC air suspension fitted to GLC X253 models is subject to multiple concurrent failure modes.2015 onwardSuspension
OccasionalSuspension $1,400–$8,000 to fix

Can't confirm for this car

Optional AIRMATIC air suspension fitted to GLC X253 models is subject to multiple concurrent failure modes. Air strut rubber bellows become brittle and develop cracks or pinholes with age, causing slow overnight height loss or sudden collapse. The air compressor overworks to compensate for strut leaks and eventually burns out, triggering a 'Visit Workshop' or 'STOP Vehicle Too Low' dashboard message and fault codes C1324-001 and C1325-001 relating to rear damping solenoid valve communication. Height sensor arms corrode at their attachment points and deliver incorrect ride height readings to the control module, producing uneven chassis stance or a vehicle stuck in the fully raised position.

Symptoms to notice

  • Vehicle sitting noticeably lower on one corner or all corners after overnight parking
  • Dashboard warning: Air Suspension Failure Visit Workshop or STOP Vehicle Too Low
  • Air compressor audibly cycling continuously or when parked with engine off
  • Uneven ride height side-to-side or vehicle stuck in raised highway mode

What to check

  1. Park the vehicle on level ground overnight and inspect ride height the following morning before starting the engine — a sagging corner confirms a leaking strut.
  2. During the drive listen for the compressor running excessively.
  3. Scan for AIRMATIC fault codes C1324 and C1325 using STAR diagnostics.
  4. Inspect all four height sensor rods for corrosion and confirm secure pivot attachment.
  5. Ask the seller directly whether the vehicle has ever sat low or displayed air suspension warnings.

Where to look: All four corners for air struts, engine bay or boot area for the compressor, suspension subframe mounting points for height sensors

Parts involved: Air suspension strut, Shock absorber / strut.

Ask the seller

  • “Has the vehicle ever displayed an air suspension warning or sat lower than normal?”
  • “Has the AIRMATIC compressor, any air strut, or any height sensor been replaced?”
  • “Is the vehicle currently sitting at even and correct ride height on all four corners?”

02GLC X253 Electro-Hydraulic Parking Brake Actuator Motor Failure

Apply and release the electric parking brake three to four times and verify smooth, complete operation.2015 onwardBrakes
OccasionalBrakes $800–$2,500 to fix

Can't confirm for this car

The GLC uses an electro-hydraulic actuator integrated into each rear calliper for parking brake function. The actuator motor and reduction gearbox mechanism fail with age, leaving the parking brake inoperative or permanently engaged. A seized actuator in the applied position causes rear brake drag that destroys rear pads and rotors. Replacement requires specialist electronic tooling to retract the piston and service the calliper correctly.

Symptoms to notice

  • Electric parking brake warning light on instrument cluster
  • Parking brake that fails to apply or release on command
  • Rear brake drag causing premature pad and rotor wear
  • Grinding or heat from rear when driving if actuator seizes engaged

What to check

  1. Apply and release the electric parking brake three to four times and verify smooth, complete operation.
  2. Scan chassis module for EPB actuator fault codes.
  3. Inspect rear calliper actuator units for corrosion or physical damage.
  4. Ask whether any parking brake reset or calliper retraction procedure has been needed.

Where to look: Rear brake callipers, integrated EPB actuator motor on each calliper

Ask the seller

  • “Has the parking brake ever failed to release or apply?”
  • “Has an EPB actuator been replaced on either rear calliper?”
  • “Has there been any rear brake drag or unusual heat from the rear?”

03Panoramic sunroof panel / trim safety recalls (X253)

Ask the seller for proof outstanding recalls (including the panoramic roof) have been completed, or check the VIN with a Mercedes dealer.2015–2022Body & Rust
OccasionalBody & Rust $0–$2,500 to fix

Can't confirm for this car

Several GLC X253 recalls concern the panoramic roof: on some cars the fixed glass panel's bonding to its frame can be insufficient, risking the panel lifting or separating, and separate campaigns cover roof-lining/C-pillar trim. These are safety recalls that should be done free at a Mercedes dealer. It is worth confirming outstanding recalls have been completed, as an un-repaired roof panel is a genuine hazard.

Symptoms to notice

  • Creaking or movement from the fixed roof glass
  • Wind noise or a visible gap at the roof panel edge
  • Outstanding recall notice on the VIN

What to check

  1. Ask the seller for proof outstanding recalls (including the panoramic roof) have been completed, or check the VIN with a Mercedes dealer.
  2. Look and listen at the fixed roof glass for any movement, gap or wind noise.

Where to look: Fixed panoramic roof glass panel and C-pillar/roof-lining trim

Ask the seller

  • “Have all outstanding recalls, including the sunroof, been completed?”
  • “Is there any movement or noise from the roof glass?”

Mercedes-Benz GLC faults in detail

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.

AdBlue SCR dosing injector cloggingMajor · EngineGLC M274 2.0T Timing Chain Cold-Start Rattle and Guide WearMajor · EngineM264 auxiliary electric coolant pump failureMajor · CoolingM264 timing chain tensioner cold-start rattleMajor · EngineOM651 2.1CDi Timing Chain and Guide FailureCritical · Engine

What these repairs cost on other cars

Some of the Mercedes-Benz GLC’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Other Mercedes-Benz models

Mercedes-Benz C-Class41 documented faultsMercedes-Benz A-Class23 documented faultsMercedes-Benz E-Class23 documented faultsMercedes-Benz Vito16 documented faultsMercedes-Benz Sprinter15 documented faultsMercedes-Benz V-Class11 documented faults

Mercedes-Benz GLC buyer questions

Is the Mercedes-Benz GLC reliable?

Like any used car, it depends on the specific example and its service history. Across the 17 documented faults for the Mercedes-Benz GLC, the recurring problem areas are engine, suspension, and transmission. A Mercedes-Benz GLC 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 Mercedes-Benz GLC?

We've catalogued 17 known faults for the Mercedes-Benz GLC, covering engine, suspension, and transmission. All 17 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 Mercedes-Benz GLC?

Most single repairs on the Mercedes-Benz GLC fall between $1,200–$6,000 at NZ independent-workshop rates. Some of the 17 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 Mercedes-Benz GLC?

Yes. A Mercedes-Benz GLC 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.