The 1990 Isuzu Trooper carries 3 open NHTSA recalls — most recently covering trailer hitches and automatic transmission. Owners report 5 recurring issue clusters, led by “Tire tread separation and blowout.” Isuzu stopped selling passenger vehicles in the United States after the 2008 model year, though its commercial truck business is still here, which means parts and knowledgeable service have not disappeared the way they did for some discontinued brands. One item matters more than everything else on this list. The 3.2 and 3.5 liter V6 in the Rodeo, Trooper, Amigo, Axiom, and VehiCross uses a rubber timing belt, and on the double overhead cam versions a broken belt bends valves. If you own one of these and cannot document the last belt change, that is the first call to make. The later models are easier: the Ascender is a Chevrolet TrailBlazer, the i-280 through i-370 are Chevrolet Colorados, the Hombre is an S-10, and the Oasis is a Honda Odyssey. For those, the donor brand's parts and specs apply.
TRAILER HITCHES
Campaign #93E023000 · Jul 22, 1993
Issue: THE WELD ON THE RECEIVER UNIT OF THE TRAILER HITCH CAN BREAK.
Risk: IF THE FAILURE OCCURS, THE TRAILER CAN SEPARATE FROM THETOWING VEHICLE, AND COULD RESULT IN A VEHICLE CRASH WITHOUT WARNING.
Fix: REPLACE THE TRAILER HITCH.
POWER TRAIN:AUTOMATIC TRANSMISSION
Campaign #90V167000 · Sep 20, 1990
Issue: PUTTING IN MORE TRANSMISSION OIL THAN SPECIFIED CAN CAUSE OIL TO BLEED THROUGH AIR GROOVE ON TO THE EXHAUST MANIFOLD IF OIL TEMPERATURE RISES.
Risk: THIS COULD CAUSE SMOKE EMISSION FROM THE MANIFOLD, WHICHCOULD IGNITE RUBBER HOSES AND RESULT IN A FIRE.
Fix: REPLACE OIL LEVEL GAUGE AND NOTIFY OWNERS TO USE ONLY THE SPECIFIED AMOUNT OF AUTOMATIC TRANSMISSION FLUID.
ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS
Campaign #90V166000 · Sep 20, 1990
Issue: IMPROPERLY INSTALLED HOSE ON THE OIL COOLER COULD COME IN CONTACT WITH THE EXHAUST MANIFOLD AND COULD MELT.
Risk: ENGINE OIL COULD LEAK OUT WITH POTENTIAL FOR ENGINESEIZURE AND DAMAGE AND COULD RESULT IN A FIRE.
Fix: PROPERLY INSTALL COOLER HOSE CLIP TO PREVENT CONTACT WITH EXHAUST MANIFOLD.
What drivers and federal regulators have officially reported about the 1990 Isuzu Trooper.
TIRES
3 NHTSA complaints · 2001-09 → 2003-07
“REAR PASSENGER SIDE TIRE TREAD STARTED TO SEPARATE, CAUSING THE CONSUMER HAD TO PULL OVER”
“BLOW OUT OF A FIRESTONE ATX P235/75R15 THAT WAS PURCHASED NEW IN A SET OF REPLACEMENT TIRES”
“THE BACK LEFT TIRE WAS DEFECTIVE (STEEL SHOWING) CAUSING THE DRIVER TO LOOSE CONTROL AND RUN ACROSS THE S/B LANE OF TRAFFIC AND STRUCK A GUARDRAIL”
ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL
2 NHTSA complaints · 2003-05 → 2007-01
“MY 1990 ISUZU TROOPER, STANDARD, INTENSIFIES ITS REVS IN IDLE SUDDENLY”
“MY 1990 ISUZU TROOPER IS EXHIBITING DANGEROUS REVVING AND DROPPING OF THE IDLE”
POWER TRAIN
3 NHTSA complaints · 1994-11 → 1995-04
“DRIVE SHAFT FELL WHILE VEHICLE WAS BEING DRIVEN. TT”
“TRANSMISSION FAILURE. *AK”
ENGINE AND ENGINE COOLING
4 NHTSA complaints · 1996-08 → 1996-09
“ENGINE OIL COLER HOSE THAT WAS LAYING AGAINST THE MANIFOLD MELTED/BURST. *AK”
“MANIFOLD BURNED A HOLE THROUGH OIL COOLER HOSE, CAUSING OIL TO LEAK OUT OF ENGINE WHILE DRIVING ON HIGHWAY. *AK”
“ENGINE COOLER HOSE RECALL REPAIRS REFUSED DUE TO MODEL (90V-166). *AK”
ENGINE AND ENGINE COOLING
5 NHTSA complaints · 1996-08 → 2001-05
“CONSUMER PULLED INTO PARKING LOT, AND NOTICED SMOKE FROM FRONT OF VEHICLE. STOPPED VEHICLE , TURNED OFF ENGINE, AND SAW FLAMES WERE COMING FROM UNDER FENDER ON PASSENGER SIDE”
“WHILE DRIVING, PULLED OFF TO REST STOP, NOTICED SMOKE COMING FROM ENGINE AS SLOWING DOWN, AT REST STOP, OBSERVED FLAMES COMING THROUGH CREVICE OF VEHICLE, ANOTHER MOTORIST USED FIRE EXTINGUISHER”
“FUEL LINE LEAK, CAUSING FIRE”
Note: NHTSA also opened 6 defect investigation(s) on this vehicle that closed without action.
Issues on other model years
Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 1, 2026.
We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.
Critical for safety and preventing major damage
Replace every 75,000 miles or 7 years on the V6 in the Rodeo, Trooper, Amigo, Axiom, and VehiCross. Do the water pump, tensioner, and idlers in the same job, because the labor is nearly all in the access. The double overhead cam version is an interference design, so a failed belt means bent valves rather than a tow. The 2.6 four and the GM and Honda sourced engines in the later rebadges use chains and are not on this schedule.
Estimated cost — typical U.S. ranges
Dealer
~$935–$1175
Shop
~$655–$825
DIY
Pro only
On interference engines, a snapped belt destroys valves. Worth doing on schedule. Bundle water pump + tensioner — labor is already there.
Isuzu specified 3,750 miles under its severe schedule, which covers towing, short trips, and dusty roads. On engines this old, stay near that number and change at least once a year regardless of miles.
Estimated cost — typical U.S. ranges
Dealer
~$120–$160
Shop
~$85–$115
DIY
~$25–$55
Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.
Rotate every 7,500 miles. On the Trooper, Rodeo, and Amigo, check the tailgate-mounted spare as well. Sun exposure ages it faster than the four tires carrying the truck.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Often free at the shop where you bought the tires — worth asking before paying.
Inspect pads, rotors, hoses, and hard lines at every service. These are heavy body-on-frame trucks with rear drums on many models, and drum hardware seizes on vehicles that sit.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.
Replace every 2 years. On a truck this old it is the cheapest way to protect the master cylinder, the calipers, and the ABS unit.
Estimated cost — typical U.S. ranges
Dealer
~$180–$200
Shop
~$125–$140
DIY
~$10–$25
DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.
Keeps your vehicle running smoothly and efficiently
Change every 30,000 miles, and right away after any deep water crossing. Front and rear differentials and the transfer case each hold their own fluid. Limited-slip rear axles need the friction modifier added when refilled.
Estimated cost — typical U.S. ranges
Dealer
~$105–$140
Shop
~$75–$100
DIY
~$15–$40
AWD/4WD vehicles only. Easy drain-and-fill on most platforms.
Drain and fill every 45,000 miles, or every 30,000 if you tow. Fluid spec follows the drivetrain: Isuzu or Dexron III for the original models, Dexron VI for the GM based Ascender and i-series, and Honda fluid for the Oasis.
Estimated cost — typical U.S. ranges
Dealer
~$330–$500
Shop
~$235–$355
DIY
~$60–$180
Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.
Around 60,000 miles on conventional plugs, up to 100,000 on platinum. Rear bank access on the V6 is tight, so this is often worth pairing with other top-end work.
Estimated cost — typical U.S. ranges
Dealer
~$285–$390
Shop
~$200–$275
DIY
~$25–$100
Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.
Replace every 30,000 miles, or every 15,000 if the truck sees dirt roads or trail use.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
5-minute job on most cars; the airbox lid usually has clips, no tools needed.
Extends the life of your vehicle and improves comfort
Every 3 to 5 years. If the timing belt is being done, do the coolant at the same visit, since the water pump comes out either way. Ask the shop to check the radiator and heater hoses while it is drained.
Estimated cost — typical U.S. ranges
Dealer
~$285–$330
Shop
~$200–$235
DIY
~$25–$60
Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.
Test the battery and alternator once a year and clean the ground straps. Frame grounds corrode on trucks of this age and cause faults that look electrical but are only dirty connections.
Estimated cost — typical U.S. ranges
Dealer
~$225–$390
Shop
~$160–$280
DIY
~$130–$250
Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.
Occupant deaths in fatal crashes (FARS)
30 crashes 1990–2024
How the 30 occupant deaths break down
25
driver deaths
5
passenger deaths
30
occupant deaths
Crash years covered: 1990–2024 This model year first appears in 1990 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.
FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number
FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.
Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.
Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.
IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.
Owner-reported problem signals
Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.
4
complaints mentioning a crash
5
complaints mentioning a fire
Reviewed known issues for this vehicle·Open recalls for this vehicle
Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.
How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.
This maintenance schedule for the 1990 Isuzu Trooper reflects Isuzu's published service intervals. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.