Generations
UBS55 — Second Generation
1991–2002
3.1 TD, 3.0 DTI, 3.2 V6, 3.5 V6
Top issues to watch for
The most serious Isuzu Trooper problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Chassis and body structural corrosion (UBS55)
The Trooper suffers from severe structural corrosion affecting chassis rails, mounting points, and load-bearing body components. 1 times average rates. The galvanising process was inadequate and water traps around suspension mounting points accelerate decay. This represents the most serious safety defect on the model, with repair costs often exceeding vehicle value.
What happens if ignoredStructural corrosion compromises crash protection and can lead to suspension mounting point failure. In severe cases, the vehicle becomes unsafe to drive with risk of wheel detachment or loss of steering control. Professional welding repairs typically cost £2,000-£5,000 but may not be possible if corrosion is too extensive.
Independent garage
£2,000–£4,000
Specialist
£2,500–£5,000
Parts only
£300–£800
Major
Steering play and column bearing wear (UBS55)
The Trooper exhibits excessive steering wheel free play due to worn steering column top bearing and steering box wear. MOT data shows free play failures at 157.7 times the fleet average and column bearing wear at 48.7 times average rates. The heavy weight of the vehicle and recirculating ball steering system create high loads that cause premature wear. This affects directional stability and requires constant steering corrections.
What happens if ignoredExcessive steering play reduces vehicle control and increases driver fatigue on long journeys. In extreme cases, the vehicle may become difficult to keep in a straight line at motorway speeds. Steering box rebuild or replacement typically costs £800-£1,500 plus labour.
Independent garage
£600–£1,000
Specialist
£800–£1,400
Parts only
£200–£500
Major
Wheel bearing failure (UBS55)
The Trooper suffers from premature wheel bearing failure, particularly on the front axle. MOT data shows bearing play failures at 22.1 times the fleet average across all mileage bands. The vehicle's weight, combined with 4WD system loads and the hub design, places high stress on the bearings. Front bearings are more commonly affected than rear, with failure often accompanied by ABS sensor damage.
What happens if ignoredA collapsed wheel bearing can cause wheel detachment and loss of vehicle control. Early symptoms include noise and vibration, progressing to dangerous play in the wheel assembly. Replacement of a front wheel bearing assembly typically costs £200-£400 including labour.
Independent garage
£150–£300
Specialist
£200–£400
Main dealer
£300–£500
Parts only
£60–£150
Major
Transmission and driveline wear (UBS55)
The Trooper's 4WD transmission system experiences premature wear of CV joints, propshaft universal joints, and transfer case components. The permanent 4WD system with center differential places constant stress on driveline components, while the vehicle's weight and off-road usage accelerate wear patterns.
What happens if ignoredFailed CV joints cause clicking noises and eventual loss of drive to the affected wheel. Transfer case problems can disable the 4WD system entirely. A CV joint replacement costs £200-£400 per side, while transfer case rebuilds can cost £1,000-£2,000.
Independent garage
£300–£600
Specialist
£400–£800
Parts only
£100–£300
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems.
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Isuzu Trooper fails at a significantly higher rate than the average car.
Fixings missing or insecure
Bodywork · 100-120k miles
MOT failure rate: 141x the fleet average
Sample: 1,860 tests
Free play in the steering, measured at the rim ...
Steering · 80-100k miles
MOT failure rate: 116x the fleet average
Sample: 1,764 tests
Excessive radial movement between the top of th...
Steering · 80-100k miles
MOT failure rate: 55x the fleet average
Sample: 654 tests
Vehicle structure corroded to the extent that t...
Bodywork · 40-60k miles
MOT failure rate: 55x the fleet average
Sample: 228 tests
Bumper insecure or with damage
Bodywork · 80-100k miles
MOT failure rate: 54x the fleet average
Sample: 201 tests
Body, cab or chassis corroded at a mounting point
Bodywork · 60-80k miles
MOT failure rate: 41x the fleet average
Sample: 215 tests
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Related
Isuzu Trooper reliability FAQs
What are the most common problems with the Isuzu Trooper?
The Isuzu Trooper has 5 known issues across 3 severity levels. The most serious are: Chassis and body structural corrosion (UBS55).
Is the Isuzu Trooper reliable?
The Isuzu Trooper has 1 dangerous and 3 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Isuzu Trooper problems?
Repair costs range widely. The most significant issue (Chassis and body structural corrosion (UBS55)) costs £2,000–£4,000 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.