Isuzu MU-X Problems: Used Buyer's Guide for Both Generations

The Isuzu MU-X is a D-MAX-based 4WD wagon, and this guide covers the 3.0-litre turbo-diesel sold in both generations. The checks Australian motoring sources list are mostly diesel and hard-use wear: EGR and DPF soot, driveline noise, towing strain and underbody damage. Add a steering bolt recall on 2020–2022 cars and an engine software recall on 2020–2024 cars. Then get it inspected.

Which Isuzu MU-X generation are you looking at?

First generation (2014–2021). carsales says the MU-X launched in Australia early in 2014 and ran for seven years. The only engine its guide lists is a 3.0-litre turbo-diesel. Launch cars had a five-speed manual or five-speed auto, in rear-drive or 4WD form. Rear park sensors, a camera and hill descent control were added across the range in late 2016, six-speed manual and auto gearboxes arrived in early 2017, and the cabin was upgraded in mid-2018. The 4WD system allows high range to be engaged on the move, low range needs the car stopped, and there's no rear differential lock (carsales, buying a used MU-X 2014–21).

CarExpert's test of a 2020 LS-T lists the engine as the 4JJ1-TC with a diesel particulate filter, 130kW and 430Nm, a six-speed Aisin auto, servicing every 15,000km or 12 months and a six-year/150,000km warranty (CarExpert, 2020 MU-X LS-T). CarsGuide, answering a 2017 owner, refers to a five-year warranty with a 130,000km limit, so cover differs by year (CarsGuide, MU-X engine problems). Confirm what applies to the exact car by VIN.

Second generation (2021 on). CarExpert's launch review, dated August 2021, lists the D-MAX's 4JJ3-TCX engine making 140kW and 450Nm, a six-speed Aisin auto, part-time 4x4 with low range, a locking rear differential and 3.5-tonne braked towing. It also lists eight airbags, autonomous emergency braking, lane-keep assist, blind-spot monitoring and adaptive cruise control, 12-month/15,000km servicing and a six-year/150,000km warranty, across LS-M, LS-U and LS-T grades in 4x2 and 4x4 (CarExpert, 2022 MU-X). If the car you're looking at has a different engine, confirm its specification with an Isuzu UTE dealer.

What are the most common Isuzu MU-X problems?

These are reported by Australian motoring writers and owners. They aren't failure rates. As with the D-MAX, most of the list comes from diesel ownership and hard use.

EGR and DPF soot on short-trip cars

carsales lists a clogged EGR valve as a first-generation check, with sooty exhaust, rough idling and hard starting as the signs. It also warns that the DPF can clog on cars used for short urban trips and may need costly dismantling if the car never gets a regular hard run on country roads (carsales). On the second generation, CarsGuide fielded a 2023 owner seeing frequent DPF burn messages. Its answer was that makers now seem to program burns to happen more often, and that a burn cut short when the car stops may be tried again straight away (CarsGuide, MU-X problems). Ask how the car has been driven.

Driveline noise and vibration

carsales says noise from the front driveshaft universal joints is common, and that front CV joints on 4WD cars can clunk on tight turns, either from off-road damage or from wear within about 100,000km (carsales). CarsGuide answered a 2014 owner with a drone and vibration at highway speed. The possible causes it gave were an out-of-balance wheel, tyre or driveshaft, or a driveline resonance that shows up when the torque converter locks, and it said it had heard Isuzu was remapping some engine computers to move the affected speed range (CarsGuide, MU-X problems page 2).

Towing strain

carsales says families who haul camper trailers will likely love the MU-X, and that a burnt smell from the transmission fluid points to overheating, often from towing or slow off-road work (carsales). CarsGuide told a 2021 owner that frequent gear changes with a caravan behind are usually normal, but shifting for no clear reason is worth a scan and a calibration check (CarsGuide).

Engine noise and oil use

carsales says clatter at start-up and a rhythmic tick under acceleration are said to be traits of the Isuzu diesel, and that the noise has at times been blamed on dirty oil, clogged injectors or worn belts. Its advice is to buy one that doesn't make the noise (carsales). On oil use, CarsGuide told a 2021 owner that around 700ml per 2,000km isn't excessive for a modern turbo-diesel and that regular dipstick checks are the way to spot a change (CarsGuide, MU-X engine problems).

Electrical and cabin faults

CarsGuide's owner questions include intermittent front air-conditioning airflow on a 2014 car, a blocked air-conditioning drain hose on a 2021 LS-T, a park brake warning that stayed on in a 2015 car, a key symbol on the display of a 2016 car, and batteries going flat after about three days on a 2022 car and about a week on a 2023 car (CarsGuide; page 2). None of these is a pattern you can put a number on. They do tell you what to switch on and test.

Second-generation driver aids and front tyre wear

A 2023 owner asked CarsGuide whether the emergency braking could be switched off, and CarsGuide said complaints about over-sensitive emergency braking and lane-keeping are increasingly common among car owners. Another 2023 4WD had front tyres worn by faulty steering knuckles, which raised a warranty question about who pays for the tyres (CarsGuide). Look closely at the front tyres on a 2021-on car.

Underbody damage

carsales says to look for damage to the sills, side steps, exhaust and rear undertray (where fitted) from off-road use, and warns that salt water on a scuffed underside can do immediate harm (carsales).

What Isuzu MU-X recalls should I check?

We read each of these on the federal register. The list is as at November 2026 and may not be complete, so check the VIN at vehiclerecalls.gov.au and with an Isuzu UTE dealer.

What this means for you: on a 2020–2022 MU-X, ask the dealer to confirm by VIN that the steering shaft bolt check is done. On a 2020–2024 MU-X, confirm the engine software update as well. carsales also flags the 2020–22 steering bolt issue in its used guide.

What our inspectors check on an Isuzu MU-X

This is what we look at, and which package includes it. It's a list of checks, not a claim that the car has these faults.

1. 1.OBD-II scan for stored and pending fault codes, including DPF, EGR and transmission-related codes. (Every package)
2. 2.Engine bay: oil and coolant leaks, fluid levels and condition, start-up behaviour and idle quality. (Every package)
3. 3.Brakes, steering and tyres, with a close look at front tyre wear patterns. (Every package)
4. 4.Full mechanical inspection: engine, cooling, gearbox, front driveshaft joints, CV joints and boots, suspension, mounts and exhaust. (Comprehensive and Elite)
5. 5.Underbody photos, with the undertray removed where fitted, safe and permitted. We photograph sills, side steps, the exhaust and any scrapes, dents or salt residue. (Comprehensive and Elite)
6. 6.Transmission fluid condition where it can be checked, and shift quality on the road test. (Comprehensive and Elite)
7. 7.Interior and electronics: air-conditioning airflow, locking, dash warnings and driver-aid warning lights. (Every package. Comprehensive and Elite add a full electrical test)
8. 8.Exterior paint and body repair indicators. (Comprehensive.) Elite adds a paint thickness gauge on every panel. Essential has no paint check.
9. 9.PPSR check. (Comprehensive and Elite. Essential doesn't include one)
10. 10.Senior inspector and a cold start when the seller leaves the engine cold. (Elite only)
11. 11.History deep-dive, valuation and on-site negotiation. (Elite only)

Road tests are 3–5 km on Essential, 6–10 km on Comprehensive and 10–12 km on Elite. You can see how findings are laid out in our sample report.

How should you test-drive a used MU-X?

• Ask the seller to leave the engine cold. Listen for clatter at start-up and watch the exhaust.
• Full-lock turns each way at walking pace on a 4WD, listening for clunks from the front.
• Hold a steady highway speed and feel for a drone or vibration through the floor.
• Accelerate up a hill and watch for flaring or slow downshifts.
• Try high range and low range yourself on a loose surface, if the seller agrees.
• After the drive, look under the car for drips and smell around the transmission.

What paperwork and PPSR checks do you need?

• A PPSR check for finance owing, write-off and stolen status. It's in Comprehensive and Elite. See PPSR check NSW.
• The service book and invoices. On a diesel that tows, look for transmission and differential fluid changes as well as engine oil.
• Recall completion by VIN, using the table above.
• Warranty status. Cover has differed by year, so confirm the start date and kilometre limit with an Isuzu UTE dealer.
• Towing and off-road history. Ask what was towed and how often, and whether the car has been on beaches.

How do you negotiate on a used MU-X?

• No service history on a diesel is your strongest lever, or your reason to walk away.
• Driveline clunks or vibration need a diagnosis and a quote before you agree on a price.
• Burnt-smelling transmission fluid on a tow car is a serious cost risk.
• Underbody scrapes and a dented exhaust are money off.
• Open recalls should be completed before you pay.

Our Elite inspector can negotiate on the spot using the findings. If you're comparing brands, our Isuzu pre-purchase inspection page covers the D-MAX as well.

Is a used Isuzu MU-X a good buy? Our verdict

Yes, for a buyer who tows or goes off-road, as long as the history is real and the recalls are done.

• 2014–2016 first generation: the oldest, with five-speed gearboxes. Buy on service history, driveline noise and underbody condition.
• 2017–2021 first generation: six-speed gearboxes and, from mid-2018, a better cabin. carsales says the MU-X is better for buyers who can afford a late LS-T with the six-speed auto.
• Second generation, 2021 on: more power, a rear diff lock, 3.5-tonne towing and a longer list of driver-assist equipment. Check the 2020–2022 steering bolt recall, the 2020–2024 engine software recall and the front tyres.

carsales says the MU-X suits families who tow camper trailers and head off-road, and is less suited to people who rarely leave town. That matches the fault list: carsales ties DPF clogging to short urban trips.

Isuzu MU-X FAQs

What are the most common Isuzu MU-X problems?

carsales lists clogged EGR valves, DPF clogging on short-trip cars, front driveshaft joint and CV joint noise, burnt transmission fluid on cars that tow, start-up engine clatter and underbody damage. CarsGuide's owner questions add air-conditioning faults, flat batteries on 2022–2023 cars and front tyre wear on a 2023 car. These are reported issues, not failure rates.

Is the Isuzu MU-X 3.0 diesel reliable?

We found no reliability score in the sources we checked, so we don't quote one. carsales describes the 3.0 as an engine built to slog, and the engine checks it lists are EGR and DPF soot, injectors and oil condition. CarsGuide told a 2021 owner that around 700ml of oil per 2,000km isn't excessive for a modern turbo-diesel. Judge each car on its service history.

Does the Isuzu MU-X have a DPF?

CarExpert's test of a 2020 MU-X describes the 3.0 as fitted with a diesel particulate filter, and carsales lists DPF clogging as a check on first-generation cars used for short trips. CarsGuide has also answered a 2023 owner about frequent DPF burns. If you mostly drive short distances, ask the seller how the car has been used.

Has the Isuzu MU-X been recalled in Australia?

Yes. The federal register lists second-row seatbelt anchor nuts on 2013–2014 cars (REC-000669), a seatbelt angle sensor (REC-000670), the lower steering shaft bolt on 2020–2022 cars (REC-005647) and engine software that can stall the engine on 2020–2024 cars (REC-006052). This is as at November 2026. Check the VIN at vehiclerecalls.gov.au.

How much can an Isuzu MU-X tow?

CarExpert's August 2021 launch review lists 3.5 tonnes braked for the second-generation MU-X. We haven't quoted a figure for the first generation because the sources we checked weren't consistent. Read the compliance plate and the handbook for the exact car, and remember that passengers and luggage count against the gross combination mass.

Which inspection should I book for an MU-X?

Comprehensive ($329) is our minimum for an MU-X. It includes full mechanical inspection, underbody photos, exterior paint and body repair indicators and PPSR. Elite Buyers' Protection ($449) suits a higher-value or heavily towed car. Essential ($199) has the 150+ Point Checklist and a 3–5 km road test, but no PPSR and no paint check.

Aussie Auto Care Pty Ltd · ABN 19 701 853 090 · 02 8320 1246 · Mobile pre-purchase inspections.

Sources

carsales, Buying a used Isuzu MU-X (2014–21)

CarExpert, 2020 Isuzu MU-X LS-T road test

CarExpert, 2022 Isuzu MU-X launch test

CarsGuide, Isuzu MU-X problems (owner Q&A)

CarsGuide, Isuzu MU-X problems (owner Q&A, page 2)

CarsGuide, Isuzu MU-X engine problems

REC-000669

REC-000670

REC-003752

REC-005647

REC-006052