1990 Isuzu Trooper problems & reliability
23 owner complaints filed with NHTSA for the 1990 Isuzu Trooper. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
3 complaints report injuries (6 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine and Engine Cooling | 6 | 26% |
| Power Train | 4 | 17% |
| Electrical System | 3 | 13% |
| Structure | 3 | 13% |
| Service Brakes, Hydraulic | 2 | 9% |
| Tires | 2 | 9% |
| Equipment | 1 | 4% |
| Fuel System, Gasoline | 1 | 4% |
| Fuel System, Other | 1 | 4% |
| Seat Belts | 1 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Complaints by incident year
What owners report
“My 1990 isuzu trooper, standard, intensifies its revs in idle suddenly. Sometimes it goes up and down, up and down... And I can see how the temp gauge rises quickly. My momentary solution in such cases is to stop the car and shut off the ignition and wait, sometimes this leaves me some minutes until it starts revving…”
Engine and Engine Cooling · filed Jan 27, 2007
“Rear passenger side tire tread started to separate, causing the consumer had to pull over. Sears, trail handler, size#p235/75/r15, dot#3dhllbe488. *ak”
Tires · filed Jul 21, 2003
“My 1990 isuzu trooper is exhibiting dangerous revving and dropping of the idle. The truck accelerates without warning and is impossible now to drive safely. It is my understanding that the ecu in these trucks is faulty due to manufacturing defects. I further understand that thousands of others have these problems…”
Electrical System · filed May 11, 2003
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- ENGINE COMPARTMENT FIRES
Defect Petition DP92015 · opened Jul 30, 1992 · closed Nov 25, 1992
- HEATER CORE FAILURE
Engineering Analysis EA92018 · opened Jun 2, 1992 · closed Apr 2, 1993
- DEFECTIVE HEATER CORES
Defect Petition DP92005 · opened Mar 3, 1992 · closed Jun 2, 1992
- REAR DOOR HINGE SEPARATION
Engineering Analysis EA91033 · opened Jul 15, 1991 · closed Jul 28, 1992 · led to recall 92V093000
- REAR DOOR HINGE SEPARATION
Preliminary Evaluation PE91046 · opened Feb 19, 1991 · closed Jul 15, 1991
- DIESEL ENGINE SURGE
Preliminary Evaluation PE90087 · opened Jun 6, 1990 · closed Oct 12, 1990
Technical service bulletins
4 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 1990 Isuzu Trooper.
This bulletin outlines the procedures for using the Alpine Exchange Program (the "Exchange Program"). The Exchange Program must be used when any Alpine radio or other component covered by this bulletin is repaired under…
IB13-R-001G · Service Bulletin/Repair Instructions · issued May 8, 2023
Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural recommendations to improve dealer efficiency when submitting Parts Warranty claims. We strongly recommend dealers follow these…
WB13-X-001B · Service Bulletin/Repair Instructions · issued Aug 30, 2022
Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural recommendations to improve dealer efficiency when submitting Parts Warranty claims. We strongly recommend dealers follow these…
WB13-X-001A · Service Bulletin/Repair Instructions · issued Aug 2, 2022
This technical service bulletin outlines the detailed procedures for the air conditioning system conversion / retrofit. *tt
SB0012S002 · Service Bulletin/Repair Instructions · issued Mar 1, 2000
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
No NHTSA recall campaigns name the 1990 Isuzu Trooper in our current data. Recalls may apply only to certain VIN ranges — always confirm with a VIN check.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 1990 Isuzu Trooper?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.