Skip to content
KickTyres
Isuzu2003–2024 Critical issues documented

Isuzu D-Max RG: common faults & what to check

The RG is the Isuzu D-Max built 2019 onward. It was sold here with the 1.9 turbo-diesel and 3.0 turbo-diesel. Of the 22 faults documented for the D-Max, 7 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

Check this exact Isuzu D-Max

  • 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 →

22

Documented faults

Critical

Most serious

$600–$2,000

Typical repair

4

Systems covered

You're looking at the RG

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

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.

A 2021 Isuzu D-Max is the RG generation (2019 to now).

Start your free check on this Isuzu D-Max

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.

Isuzu D-Max RGEngine not picked yet

Pick the engine above first: the D-Max came with 2, 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

Isuzu D-Max · 2021

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 Isuzu D-Max before you hand over any money. Every documented fault is listed below, each with its own page.

  • Serious issue

    Verify the vehicle's VIN against the ACCC recall database at vehiclerecalls.gov.au or NZ NZTA recall register.

    See why

    Fuel Delivery Hose Contact and Fire Risk – RG

    An incorrectly routed fuel delivery hose on certain 2020–2023 RG D-Max utes contacts the engine oil-level gauge bracket during normal engine movement. Repeated abrasion causes the hose to wear through its wall, allowing diesel to leak in proximity to hot engine surfaces and ignition sources, creating a fire risk. Isuzu Australia issued a mandatory recall (ACCC REC-003873 and related recall) covering 36,966 vehicles built between 2020 and 2023 across all cab configurations. The remedy is free inspection and hose replacement at authorised Isuzu dealers. This is a production-line fitment defect rather than a wear-related fault, but unrepaired units remain in the used market.

    What you would notice

    • Smell of diesel near engine bay after running
    • Visible fuel staining or wet residue near oil dipstick bracket
    • Fuel level dropping faster than expected with no visible drip under vehicle
    • Any smoke from engine bay warrants immediate investigation

    Typically $0 to put right.

  • Costly issue

    Verify AdBlue level is adequate and that fluid is genuine (not contaminated).

    See why

    RG Series AdBlue DEF Pump Failure

    The RG D-Max (2019-present) uses a Selective Catalytic Reduction (SCR) system to meet Euro 6/5 emissions standards, requiring the injection of Diesel Exhaust Fluid (AdBlue/DEF) into the exhaust stream before the SCR catalyst. The DEF dosing pump is a precision component that circulates fluid from the tank, and it is sensitive to DEF contamination (from diesel or water ingress), crystallisation of urea residue in the pump head and injector nozzle when the system is not purged correctly, and voltage spikes during pump operation. Failure of the pump triggers a malfunction indication lamp and begins a countdown of remaining start cycles before the vehicle enforces a reduced-power or no-start condition as mandated by emission regulations. Genuine pump replacement is expensive, and the system's complexity means diagnosis often requires dealer-level scan tool access.

    What you would notice

    • AdBlue / DEF warning light on dashboard
    • Countdown message indicating remaining starts before engine power restriction
    • Reduced engine power mode activated
    • DEF level not dropping at normal rate despite normal driving (pump not dosing)

    Typically $900–$2,400 to put right.

See all 7 issues for this oneDocumented for the exact year and engine you picked, including 1 rated critical.
Engine, transmission & cooling1

01RG Series AdBlue DEF Pump Failure

Verify AdBlue level is adequate and that fluid is genuine (not contaminated).diesel2019 onwardEngine
OccasionalEngine $900–$2,400 to fix

The RG D-Max (2019-present) uses a Selective Catalytic Reduction (SCR) system to meet Euro 6/5 emissions standards, requiring the injection of Diesel Exhaust Fluid (AdBlue/DEF) into the exhaust stream before the SCR catalyst. The DEF dosing pump is a precision component that circulates fluid from the tank, and it is sensitive to DEF contamination (from diesel or water ingress), crystallisation of urea residue in the pump head and injector nozzle when the system is not purged correctly, and voltage spikes during pump operation. Failure of the pump triggers a malfunction indication lamp and begins a countdown of remaining start cycles before the vehicle enforces a reduced-power or no-start condition as mandated by emission regulations. Genuine pump replacement is expensive, and the system's complexity means diagnosis often requires dealer-level scan tool access.

Symptoms to notice

  • AdBlue / DEF warning light on dashboard
  • Countdown message indicating remaining starts before engine power restriction
  • Reduced engine power mode activated
  • DEF level not dropping at normal rate despite normal driving (pump not dosing)

What to check

  1. Verify AdBlue level is adequate and that fluid is genuine (not contaminated).
  2. Check for crystallised white urea residue around the DEF injector nozzle in the exhaust pipe.
  3. If a workshop inspection is possible: With an OBD scan tool capable of reading SCR/AdBlue fault codes, check for P20EE (SCR NOx catalyst efficiency), P203F (reductant level low), or DEF pump circuit faults.

Where to look: AdBlue tank under load floor or rear chassis, DEF pump module integrated with tank, DEF injector in exhaust pipe pre-SCR catalyst

Parts involved: Fuel injector, Catalytic converter.

Ask the seller

  • “Has any AdBlue or DEF warning light been displayed, and was it investigated?”
  • “Where is AdBlue topped up and what brand of fluid is used?”
  • “Has the vehicle ever entered reduced-power mode related to emissions?”
Body, brakes, suspension & interior1

02Rear Leaf Spring Bushing Deterioration

The D-Max uses a rear leaf spring suspension as standard on its ute body, with rubber bushings at the front eye and rear shackle of each spring pack.2011 onwardSuspension
CommonSuspension $350–$900 to fix

The D-Max uses a rear leaf spring suspension as standard on its ute body, with rubber bushings at the front eye and rear shackle of each spring pack. These bushings carry the full lateral, longitudinal, and vertical suspension loads of a laden ute and are exposed to road grime, UV, heat, and water ingress. The factory rubber compound hardens and cracks over time, accelerated by heavy towing, off-road use, and high mileage. Once the bushings deteriorate, differential movement between the spring eye and chassis mount causes metal-on-metal contact, producing knocking and banging sounds under acceleration, braking, or rough terrain. Worn bushings also allow the axle to walk fore and aft during acceleration, degrading rear traction and stability. Polyurethane aftermarket replacements last longer but can transmit more noise into the cab.

Symptoms to notice

  • Knocking or clunking from rear suspension under acceleration or braking
  • Banging sound when driving over sharp bumps or corrugations
  • Rear axle 'walking' or tramlining under hard acceleration
  • Visible cracking or deformation of rubber bushing material
  • Squeaking from rear suspension when loaded

What to check

With the vehicle on level ground, use a torch and mirror to inspect the front eye bushing (where the leaf spring bolts to the chassis hanger) and the rear shackle bushings for cracking, separation, or rubber extrusion. Rock the rear of the vehicle side to side and listen for clunking. If a workshop inspection is possible: On a hoist with the suspension hanging, check for visible movement at the spring eyes.

Where to look: Rear leaf spring front eye and rear shackle, both sides of rear axle

Parts involved: Rear leaf spring.

Ask the seller

  • “Have the rear leaf spring bushings been replaced?”
  • “Has the vehicle been regularly loaded near its payload capacity or used for towing?”
  • “Has there been any knocking or movement from the rear end?”
Fluid leaks1 critical1

03Fuel Delivery Hose Contact and Fire Risk – RG

Verify the vehicle's VIN against the ACCC recall database at vehiclerecalls.gov.au or NZ NZTA recall register.diesel2020–2023Fluid Leaks
OccasionalFluid Leaks $0 to fix

An incorrectly routed fuel delivery hose on certain 2020–2023 RG D-Max utes contacts the engine oil-level gauge bracket during normal engine movement. Repeated abrasion causes the hose to wear through its wall, allowing diesel to leak in proximity to hot engine surfaces and ignition sources, creating a fire risk. Isuzu Australia issued a mandatory recall (ACCC REC-003873 and related recall) covering 36,966 vehicles built between 2020 and 2023 across all cab configurations. The remedy is free inspection and hose replacement at authorised Isuzu dealers. This is a production-line fitment defect rather than a wear-related fault, but unrepaired units remain in the used market.

Symptoms to notice

  • Smell of diesel near engine bay after running
  • Visible fuel staining or wet residue near oil dipstick bracket
  • Fuel level dropping faster than expected with no visible drip under vehicle
  • Any smoke from engine bay warrants immediate investigation

What to check

Verify the vehicle's VIN against the ACCC recall database at vehiclerecalls.gov.au or NZ NZTA recall register. With engine cold, inspect the fuel delivery hose routing in the engine bay near the oil dipstick tube bracket for abrasion marks, cracking, or discolouration. Check whether the dealer has stamped the service record confirming hose inspection/replacement. If unrepaired, do not purchase until the recall work is completed.

Where to look: Fuel delivery hose in engine bay, adjacent to oil level dipstick bracket

Ask the seller

  • “Has the ACCC fuel hose recall been completed and stamped in the service book?”
  • “Can you confirm the VIN on the vehiclerecalls.gov.au recall check?”
Depends on the exact engine — 4 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling4

01Transfer Case Electromagnetic Coupling Dry-Out and Failure

Engage 4H while moving and listen for whining, shudder, or grinding.diesel2012–2023Transmission
OccasionalTransmission $1,500–$4,500 to fix

Can't confirm for this car

The BorgWarner-sourced electronically controlled transfer case uses an electromagnetic multi-plate clutch coupling to distribute torque to the front axle. The coupling fluid degrades or leaks over time, causing the clutch packs to run dry. This produces whining, grinding, or shudder during 4WD engagement and can result in complete failure of the shift-on-the-fly 4WD system.

Symptoms to notice

  • Whining or grinding noise when 4WD is engaged
  • Vibration or shudder through driveline in 4H
  • 4WD mode fails to engage or disengages unexpectedly
  • Transfer case warning light on dash
  • Oil leak from transfer case front output or seals

What to check

Engage 4H while moving and listen for whining, shudder, or grinding. Check the transfer case for oil leaks around the front output seal and drain plug. Have the 4WD system exercised through all modes (2H, 4H, 4L) and verify engagement is smooth and silent. Check the coupling fluid level if accessible.

Where to look: Transfer case, underside of vehicle behind gearbox

Parts involved: Transfer case.

Ask the seller

  • “Has the transfer case fluid been serviced, and has the 4WD system been regularly exercised?”
  • “Has there been any noise, shudder, or fault light associated with the 4WD system?”
  • “Has the transfer case ever been inspected for leaks or coupling wear?”

02Diesel Particulate Filter (DPF) Blockage from Short-Trip Use

Inspect the exhaust for excessive black soot around the tailpipe.diesel2014–2023Engine
CommonEngine $700–$3,800 to fix

Can't confirm for this car

The DPF on 4JJ1-TC and 4JJ3-TCX engines requires sustained highway driving for passive regeneration to clear accumulated soot. Vehicles used predominantly for urban commuting or short-run towing fail to complete regeneration cycles, resulting in a blocked filter. Active forced regeneration may also fail if temperature sensors, the post-injection system, or the EGR is faulty.

Symptoms to notice

  • DPF warning light on dashboard
  • Loss of power with limp mode activation
  • Increased fuel consumption
  • Excessive black soot around exhaust tip
  • Fault codes P2002, P244A, or P2459

What to check

  1. Inspect the exhaust for excessive black soot around the tailpipe.
  2. Check for DPF-related DTCs (P2002, P244A, P2459).
  3. Ask about typical usage pattern – mostly city driving is a red flag.
  4. If a workshop inspection is possible: Connect a scan tool and check DPF soot load percentage and the number of forced regenerations logged.

Where to look: Exhaust system, underside mid-vehicle after catalytic converter

Parts involved: Diesel particulate filter.

Ask the seller

  • “Is this vehicle used mainly for city driving or does it regularly do highway runs of 30+ minutes?”
  • “Has the DPF warning light ever come on, and has the filter been cleaned or replaced?”
  • “Has the vehicle ever been put into forced regeneration mode by a workshop?”

03ECM software recall: engine speed cut or stall (3.0 4JJ3-TCX diesel)

Ask the seller whether the engine computer software recall has been done and ask for the dealer invoice or service book stamp.diesel2020–2024Engine
RareEngine $0–$150 to fix

Can't confirm for this car

On RG D-Max utes with the 3.0 4JJ3-TCX diesel built from 2020 to 2024, the engine computer software that controls the fuel pump can wrongly reduce engine speed, so the engine may lose power or stall while driving. Isuzu Ute Australia recalled these vehicles in August 2024 (recall REC-006052) and dealers update the engine computer software free of charge. This is a different recall from the fuel delivery hose recall on 2020 to 2023 D-Max. NZ recall coverage was not confirmed, so ask an Isuzu dealer to check the VIN.

Symptoms to notice

  • Engine suddenly loses power or revs drop while driving
  • Engine stalls and needs restarting
  • Sudden drop in revs with no warning light

What to check

Ask the seller whether the engine computer software recall has been done and ask for the dealer invoice or service book stamp. On the test drive, drive at steady speed and through gentle stops and pull aways, watching for any sudden drop in revs, hesitation or stall. Ask an Isuzu dealer to check the VIN for open recalls before you buy. If a workshop inspection is possible: have the dealer confirm the ECM software level and check for stored engine fault codes.

Where to look: Engine control module (engine computer) software; no physical part to see

Ask the seller

  • “Has the Isuzu engine computer software recall been done, and can I see the paperwork?”
  • “Has the engine ever lost power or stalled while driving?”
  • “Has an Isuzu dealer checked this VIN for open recalls?”

04A960E Torque Converter Shudder at Highway Cruise

Test drive the vehicle at a steady 90-100 km/h on a flat road with light throttle to replicate full torque converter lock-up.diesel2020 onwardTransmission
OccasionalTransmission $250–$5,500 to fix

Can't confirm for this car

The RG D-Max paired with the 6-speed Aisin A960E automatic transmission has been documented to develop torque converter clutch (TCC) shudder, most commonly felt at steady highway cruise between 80 and 110 km/h when the converter is in full lock-up. The shudder presents as a rapid vibration or judder through the drivetrain resembling driving over a rumble strip. The root cause is friction material glazing or degradation in the TCC, often accelerated by towing or high-load driving. A transmission fluid drain and refill with OEM-specified fluid resolves the symptom in early-stage cases. Advanced cases require torque converter replacement. Isuzu issued a technical service bulletin recommending ATF replacement as first-step diagnosis.

A cutaway automatic transmission torque converter showing the internal turbine and stator.Example of the part — not this vehicle

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

  • Rapid vibration or shuddering felt through the seat and steering wheel at steady 80-110 km/h cruise
  • Symptom disappears when accelerating or decelerating out of the affected speed range
  • Vibration matches engine rpm rather than wheel speed, confirming drivetrain origin
  • No fault codes stored in many early-stage cases despite obvious symptom
  • Worsens progressively with towing or heavy-load driving history

What to check

  1. Test drive the vehicle at a steady 90-100 km/h on a flat road with light throttle to replicate full torque converter lock-up.
  2. Note any vibration or shudder.
  3. Check the transmission fluid condition and colour — dark or burnt-smelling ATF is a strong indicator of TCC wear.
  4. Ask about towing history.
  5. If the vehicle has a transmission service record showing OEM ATF replacement this is a positive sign, as early intervention often eliminates the symptom.

Where to look: Torque converter housed at the front of the A960E automatic gearbox, between the engine flexplate and the transmission pump

Parts involved: Torque converter.

Ask the seller

  • “Has a transmission fluid service been performed, and if so was OEM Isuzu-specified ATF used?”
  • “Has the vehicle experienced any vibration or shuddering at highway speeds?”
  • “What towing history does the vehicle have — weight and frequency?”
Other Isuzu D-Max engines and years15 documented issues that do not apply to the one you picked.
Engine, transmission & cooling10

01Denso High-Pressure Fuel Pump (HPFP) Internal Failure

Ask about any history of hard starting, erratic running, or sudden power loss.diesel2012–2020Engine
OccasionalEngine $3,500–$9,000 to fix

Does not apply

The Denso high-pressure common rail fuel pump fitted to the 4JJ1-TC can suffer internal wear of the pump roller and plunger, releasing metal debris into the high-pressure fuel circuit. This debris contaminates the fuel rail, pressure regulator, and all four injectors simultaneously. A complete fuel system flush and replacement of the pump, fuel rail, pressure limiting valve, and injectors is required.

Symptoms to notice

  • Hard starting, especially when hot
  • Erratic idle with multiple cylinder misfires
  • Sudden severe power loss under load
  • Metal particles visible in fuel filter
  • Low or unstable fuel rail pressure readings

What to check

  1. Ask about any history of hard starting, erratic running, or sudden power loss.
  2. Check fuel rail pressure at idle and under load using live data – low or erratic rail pressure at correct pump speed indicates pump wear.
  3. If a workshop inspection is possible: Connect a scan tool and check for injector balance rate deviations across all cylinders.
  4. Check for any metallic contamination by removing the fuel filter.

Where to look: High-pressure fuel pump mounted on engine block, top/side

Parts involved: High-pressure fuel pump.

Ask the seller

  • “Has the vehicle ever suffered hard starting, sudden power loss, or an unexplained need for injector work?”
  • “Has the fuel filter been changed at recommended intervals, and was any metallic contamination noted?”
  • “Has the high-pressure fuel pump ever been replaced or inspected for wear?”

024JJ1-TC Timing Chain Stretch and Guide Wear

Start the engine cold and listen for a rattling or chattering noise from the front of the engine during the first 5-10 seconds of running.diesel2012–2020Engine
OccasionalEngine $1,800–$5,000 to fix

Does not apply

The primary timing chain on the 4JJ1-TC 3.0L diesel engine is known to stretch prematurely when oil change intervals are extended or low-quality oil is used. Chain stretch causes the engine timing to retard, producing a rattling noise on cold start and rough running. If the chain skips a tooth or snaps, catastrophic piston-to-valve contact results in total engine destruction.

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 chattering noise from front of engine on cold start
  • Rough idle that may settle after warm-up
  • Camshaft/crankshaft correlation fault codes P0016 or P0017
  • Reduced engine power and increased smoke
  • Oil sludge visible inside the engine

What to check

  1. Start the engine cold and listen for a rattling or chattering noise from the front of the engine during the first 5-10 seconds of running.
  2. Ask for full service history to verify oil change intervals were not exceeded.
  3. Check for oil sludge by removing the oil filler cap.
  4. If a workshop inspection is possible: Connect a scan tool and check camshaft/crankshaft correlation codes (P0016, P0017).

Where to look: Front of engine, timing cover

Parts involved: Timing chain.

Ask the seller

  • “Has the vehicle always been serviced on schedule, and what oil grade and brand was used?”
  • “Has there ever been a rattling noise on cold start from the front of the engine?”
  • “Has a scan tool been used recently, and were any camshaft or crankshaft correlation codes present?”

034JJ1 Timing Chain Elongation & Cam Timing Drift

Cold-start the engine and listen for chain rattle from the front timing cover during the first 10-20 seconds.diesel2012–2019EngineRead the full fault: symptoms, where to look, what to ask the seller

044JJ1 DPF Blockage on Later TF Models

Check for oil leaks around valve covers, sump and gaskets.diesel2007–2020Engine
CommonEngine $2,660–$5,320 to fix

Does not apply

Later TF D-Max variants fitted with DPF systems exhibit premature blockage when operated on short duty cycles. The DPF regeneration system requires sustained periods above 60km/h at moderate load to complete. Fleet operators running D-Maxes on predominantly site-access and urban logistics routes report DPF service intervals significantly shorter than the manufacturer's guidance.

Symptoms to notice

  • Evidence of engine wear or deterioration
  • Warning light or abnormal behaviour noted during operation

What to check

  1. Check for oil leaks around valve covers, sump and gaskets.
  2. Inspect coolant condition and level.

Parts involved: Diesel particulate filter.

05Aisin 6-Speed Auto Shift Solenoid Wear (TF)

Test drive and perform multiple gentle and firm upshifts through all gears.diesel2016–2019Transmission
OccasionalTransmission $1,800–$4,500 to fix

Does not apply

The TF D-Max automatic variants use an Aisin-Warner 6-speed automatic transmission (TB-60SN / AR60F family). The transmission relies on a solenoid body containing multiple variable-bleed solenoids to control hydraulic pressure to each clutch pack. At higher mileage, particularly with infrequent fluid changes or extended towing, the solenoid spool valves wear and begin to pass fluid when commanded to close, resulting in incorrect clutch apply pressures. This manifests as delayed or harsh upshifts, flaring between gears, or the transmission defaulting to a fail-safe single gear. The valve body bores also wear, compounding the issue. A full solenoid body replacement or valve body recondition is typically required, as individual solenoid replacement rarely resolves the hydraulic leak path in the worn bore.

Symptoms to notice

  • Harsh or delayed upshifts, particularly 1-2 and 2-3
  • Transmission flare (engine revs rise between gears without acceleration)
  • Transmission warning light or fault code relating to solenoid circuit
  • Transmission defaulting to limp-home mode (fixed gear)
  • Shudder on light throttle application at cruise speed

What to check

  1. Test drive and perform multiple gentle and firm upshifts through all gears.
  2. Note any hesitation, flare, or harshness during gear changes.
  3. Check transmission fluid condition: dark, burnt-smelling fluid indicates overheating history which accelerates solenoid wear.
  4. If a workshop inspection is possible: Pull transmission fault codes with an OBD scan tool before purchase — solenoid codes (P0750-P0775 range) indicate valve body wear.

Where to look: Aisin automatic transmission unit under vehicle, accessible via sump pan internally

Parts involved: Clutch, Mechatronic / valve body.

Ask the seller

  • “Has the automatic transmission fluid been changed, and at what intervals?”
  • “Has the transmission ever slipped, flared, or shifted harshly?”
  • “Has any transmission warning light appeared, even momentarily?”

06TF Transfer Case Shift Fork Wear

The TF D-Max 4WD transfer case uses a mechanically actuated shift rail and fork system to engage 4H and 4L drive modes.2011–2019Transmission
OccasionalTransmission $1,600–$4,200 to fix

Does not apply

The TF D-Max 4WD transfer case uses a mechanically actuated shift rail and fork system to engage 4H and 4L drive modes. The shift fork is a cast aluminium or alloy component that physically moves the range sleeve into engagement with the front output shaft dog teeth. Under repeated 4WD engagement cycles, particularly if mode changes are made while the vehicle is still slightly moving or under load (a common user error), the fork tips wear against the engagement sleeve. Worn fork tips fail to push the sleeve fully into engagement, resulting in incomplete 4WD engagement, neutral conditions between shift positions, or the system locking between modes. The transfer case shift motor or vacuum actuator may work correctly but cannot overcome the mechanical binding caused by a worn or bent fork, making electrical diagnosis misleading.

Symptoms to notice

  • 4WD mode indicator flashing or failing to confirm engagement
  • Grinding or resistance when switching between 2H, 4H, and 4L
  • Vehicle remaining in 2WD despite 4H/4L selection
  • Neutral condition — no drive in any wheel — when switching modes
  • Clunking or mechanical binding sound from under the vehicle when shifting modes

What to check

In a safe off-road area or car park, attempt to engage 4H and 4L from a slow roll (under 5 km/h) and verify the dashboard indicator confirms full engagement within 5 seconds. Note any resistance, grinding, or flashing light. Ask specifically whether the vehicle has been used off-road regularly and whether 4WD has ever failed to engage. A transfer case with a known fault history should be inspected by a 4WD specialist before purchase.

Where to look: Transfer case, midships under the vehicle between gearbox and front/rear prop shafts

Parts involved: Transfer case.

Ask the seller

  • “Has 4WD ever failed to engage or shown a flashing warning light?”
  • “Has the transfer case or 4WD system had any workshop attention?”
  • “How frequently is 4WD used and in what conditions?”

076-speed automatic solenoid pack and valve body wear

Test drive including full-throttle acceleration through all gears, light-throttle cruising 60–100 km/h, and parking lot manoeuvres from P to D/R.diesel2016–2020Transmission
OccasionalTransmission $1,600–$4,000 to fix

Does not apply

TF D-Max models with the Aisin 6-speed automatic develop shift solenoid and valve body wear from approximately 150,000 km, particularly in vehicles used for heavy towing or urban stop-start driving. Symptoms include delayed gear engagement, harsh or hunting shifts, and occasional limp-mode events. The solenoid pack can fail individually or the valve body may require full replacement. Documented by AU/NZ Isuzu and Aisin gearbox specialists.

Symptoms to notice

  • Harsh or jerky upshifts or downshifts
  • Transmission hunting between gears at highway speed
  • Delayed engagement from Park or Neutral into Drive
  • Transmission warning light or limp mode (limited to 3rd gear)
  • Shudder under light throttle at 60–100 km/h

What to check

  1. Test drive including full-throttle acceleration through all gears, light-throttle cruising 60–100 km/h, and parking lot manoeuvres from P to D/R.
  2. Check for transmission fault codes.
  3. Ask about transmission fluid service history.

Where to look: 6-speed automatic transmission, driver's side undercarriage

Parts involved: Mechatronic / valve body.

Ask the seller

  • “Has the transmission fluid been serviced?”
  • “Any harsh shifting or transmission warning lights?”
  • “Has the vehicle been used for heavy towing?”

084JA1/4JK1 Injector Cup Seat Seal Failure Causing Coolant Ingress

Perform a combustion gas test (block test) on the coolant reservoir.diesel2003–2012EngineRead the full fault: symptoms, where to look, what to ask the seller

09EGR Valve Carbon Clogging Causing Rough Idle and Power Loss

Check the EGR cooler for external coolant weeping or internal contamination of the intake tract.diesel2008–2019EngineRead the full fault: symptoms, where to look, what to ask the seller

10Suction control valve (SCV) sticking, low rail pressure (3.0 4JJ1-TC diesel)

Scan for P0087/P0088/P1093/P1094 codes first.diesel2007–2020EngineRead the full fault: symptoms, where to look, what to ask the seller
Body, brakes, suspension & interior5

01Rear Leaf Spring Main Blade Fracture Under Load

Inspect both rear leaf spring main blades along their full length for cracks, particularly at the spring eyes and at each U-bolt clamp point.2003–2019Suspension
OccasionalSuspension $600–$1,400 to fix

Does not apply

The rear leaf spring pack on dual-cab and space-cab D-Max variants is subject to main blade fracture when the vehicle is operated at or near GVM with heavy tray or canopy fitments. The fracture initiates at the spring eye or at the first clamp point where stress concentration is highest. A broken main blade causes the axle to shift rearward under braking and can contact the fuel tank or brake lines. Vehicles used for towing at rated capacity are at elevated risk. This failure has been documented across both RC and TF chassis.

Symptoms to notice

  • Audible loud crack followed by vehicle pulling to one side under braking
  • Visible sagging on one side of the rear of the vehicle when parked
  • Rear axle visible misalignment or axle shifted in wheel arch
  • Clunking from rear suspension over bumps where previously none was present

What to check

  1. Inspect both rear leaf spring main blades along their full length for cracks, particularly at the spring eyes and at each U-bolt clamp point.
  2. Look for rust staining lines radiating from a central crack.
  3. Check that the axle is centred evenly in both rear wheel arches.
  4. Load the tray to typical operating weight if safe to do so.

Where to look: Rear axle — leaf spring pack, both sides; main blade most commonly fractures at forward spring eye or first U-bolt clamp

Parts involved: Rear leaf spring.

Ask the seller

  • “Has the vehicle been regularly loaded at or near its GVM or towed at rated capacity?”
  • “Have the rear leaf springs ever been replaced or had additional leaves fitted?”
  • “Is there any visible sag or asymmetry in the rear ride height?”

02TF Front Lower Control Arm Ball Joint Wear

Then grasp at 9 and 3 o'clock to check for lateral play specific to the ball joint.2011–2019SuspensionRead the full fault: symptoms, where to look, what to ask the seller

03Front Upper Ball Joint Wear and Separation (Subject of AU Recall)

Inspect the ball joint boot for cracking or grease expulsion.2012–2016Suspension
OccasionalSuspension $350–$750 to fix

Does not apply

The front upper ball joint on TF-series D-Max is prone to premature wear, with the ball stud able to separate from the socket under load — particularly during cornering or braking. Isuzu Australia issued a recall (ACCC PRA 2013/15592) covering affected vehicles. Separation of the upper ball joint causes immediate loss of directional control. The failure mode is accelerated by off-road use, particularly where the suspension is cycled through full articulation. Post-recall vehicles should have had ball joints inspected and replaced as needed, but many privately sold examples may not have had the recall completed.

The front wheel of a car splayed outward with the lower control arm hanging down after a ball joint separation.Example of the part — not this vehicle

A separated lower ball joint: the control arm has dropped and the wheel has splayed out under the guard.

Elfix · CC0 · Wikimedia Commons

Symptoms to notice

  • Clunking from the front suspension when turning at low speed or over small bumps
  • Vague or wandering steering feel that worsens over time
  • Uneven front tyre wear on inner or outer edge
  • In advanced cases, visible play when the wheel is grasped at 12 and 6 o'clock and rocked

What to check

  1. Inspect the ball joint boot for cracking or grease expulsion.
  2. Verify whether the Isuzu Australia recall ACCC PRA 2013/15592 has been completed by checking the VIN against Isuzu's recall database.
  3. If a workshop inspection is possible: With the vehicle on a hoist and weight off the front suspension, grasp each front wheel and check for play in the upper ball joint by rocking the wheel top-to-bottom.

Where to look: Front suspension — upper control arm ball joint, both sides

Parts involved: Ball joint.

Ask the seller

  • “Has this vehicle had the Isuzu Australia front upper ball joint recall (PRA 2013/15592) completed?”
  • “Is there any clunking from the front suspension over bumps or when turning?”
  • “When were the front upper ball joints last inspected or replaced?”

04Front Leaf Spring Eye Pin and Bushing Wear

Bounce each front corner and listen for a metallic knock.diesel2012–2020Suspension
CommonSuspension $500–$2,000 to fix

Does not apply

The front leaf spring eye pins and their rubber bushings wear prematurely on vehicles used on unsealed roads or with heavy payloads. As the bushings deteriorate, the spring eye moves laterally on the pin, causing a characteristic clunk or knock over bumps and road imperfections. Worn pins allow caster angle to shift, causing vague steering and uneven tyre wear.

Symptoms to notice

  • Clunking or knocking from front suspension over bumps
  • Vague or wandering steering feel
  • Uneven or feathered front tyre wear
  • Vehicle pulling to one side under braking
  • Visible rubber bushing cracking or extrusion

What to check

Bounce each front corner and listen for a metallic knock. Inspect the rubber bush for cracking or collapse. Check front tyre wear for asymmetric or feathering patterns. If a workshop inspection is possible: With the vehicle on a hoist, grip each front spring eye and attempt to move it sideways and vertically – any movement indicates worn pin or bushing.

Where to look: Front leaf spring eye mounts, front chassis hangers

Parts involved: Rear leaf spring.

Ask the seller

  • “Has the front suspension been inspected for spring pin or bushing wear, and when?”
  • “Has there been any clunking from the front end, particularly on corrugated or potholed roads?”
  • “Has the vehicle had a wheel alignment done recently, and did the workshop note any worn suspension components?”

05Front lower control arm bush wear

Grasp the lower arm and attempt to move it fore-aft — excessive movement indicates failed rear bush.diesel2007–2020Suspension
CommonSuspension $300–$700 to fix

Does not apply

RA-7 and TF D-Max front lower control arms develop bush wear from approximately 80,000–120,000 km. The rear-most bush is the primary failure point, causing imprecise steering, tramping over rough surfaces and accelerated tyre wear. Trucks used for towing or off-road wear bushes faster. Replacement requires press-out of old bush or full arm replacement. Common WoF/RWC failure item in NZ and AU markets.

The front wheel of a car splayed outward with the lower control arm hanging down after a ball joint separation.Example of the part — not this vehicle

A separated lower ball joint: the control arm has dropped and the wheel has splayed out under the guard.

Elfix · CC0 · Wikimedia Commons

Symptoms to notice

  • Clunking from front suspension, especially over speed bumps or potholes
  • Steering wander or imprecision at highway speed
  • Uneven front tyre wear
  • Tramping sensation during cornering on rough surfaces

What to check

Grasp the lower arm and attempt to move it fore-aft — excessive movement indicates failed rear bush. Check both sides. If a workshop inspection is possible: With vehicle on a hoist, inspect lower arm bushes for cracking, displacement or rubber separation.

Where to look: Front lower control arms, both sides

Parts involved: Ball joint.

Ask the seller

  • “Have the front control arm bushes been replaced?”
  • “Any clunking from the front suspension?”
  • “How is the vehicle used — towing, off-road, or highway?”

What these repairs cost on other cars

Some of the Isuzu D-Max’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 Isuzu D-Max

Other Isuzu models

Isuzu Bighorn12 documented faultsIsuzu MU-X10 documented faultsIsuzu Trooper5 documented faults

Isuzu D-Max buyer questions

Is the Isuzu D-Max reliable?

Like any used car, it depends on the specific example and its service history. Across the 22 documented faults for the Isuzu D-Max, the recurring problem areas are engine, suspension, and fluid leaks. A Isuzu D-Max 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 Isuzu D-Max?

We've catalogued 22 known faults for the Isuzu D-Max, covering engine, suspension, and fluid leaks. All 22 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 Isuzu D-Max?

Most single repairs on the Isuzu D-Max fall between $600–$2,000 at NZ independent-workshop rates. Some of the 22 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 Isuzu D-Max?

Yes. A Isuzu D-Max 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.