2003 Isuzu Ascender Fuel system Problems
- Complaints
- 6about this part
- Share
- 17%of 35 total for the year
- Median mileage
- 50,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the fuel system of the 2003 Isuzu Ascender, 17% of the 35 complaints for this model year. Where a mileage was given, the median is 50,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I purchased a new 2003 Isuzu Ascender in sept. 2003. When the vehicle had approximately 500 miles on the odometer the service engine soon (ses) light came on. We took the SUV to an Isuzu dealer where I was told that I had improperly put the gas cap on and that is why the ses light came on. Within a week the ses light came on again. My husband took the car back to the dealer where the vehicle was thoroughly checked and the Isuzu dealer found a leak in the fuel tank. The tank was replaced after a lengthy wait for the proper parts. We thought the problem was solved. …”
NHTSA complaint #10196280, filed 2007-07, 30,000 miles“Smell of gasoline and dripping underneath rear beneath fuel tank (driver's side), when starting. Problem was found to be the fuel pump module at the line :output side of pump. Replaced fuel pump module and ring. Parts and pics available.”
NHTSA complaint #10248047, filed 2008-11, 55,371 miles“Filler neck broken at fuel tank. Damage not incurred by outside source. Found out from shop working on vehicle this is common occurrence. Consider this safety risk due to gas leaking.”
NHTSA complaint #10134665, filed 2005-08, 76,652 miles“Gas gauge does not accurately report the amount of gas in tank. Had problem repaired but continues to be inaccurate. Rear hatchback window opens when bump is hit. Took to dealer, and dealer could find no ptoblem. Key often does not remove from column when placed in park. Car must be cycled through on/off and placeed in reverse and then into drive again to remove key.”
NHTSA complaint #10194828, filed 2007-06Related service bulletins
- 10176607May 8, 2020This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank…
- 10083912Aug 9, 2016Some 2003-2004 model year isuzu ascender vehicles contain a fuel tank inlet check valve (icv) that could fracture. The icv is located above the full fuel level. A fractured icv…
- 10113662May 27, 2015This informational bulletin provides dealership personnel with information on flexible fuel vehicles (FFVs) and the usage of E85 fuel in GM vehicles.
- 10137901May 9, 2014This informational bulletin provides the technician with information on what E85 fuel may due to a non E85 vehicle.
- 10055234Feb 1, 2014Isuzu: see document search button for the owner letter. The malfunction indicator light (mil) is on, due to fracture of weld on fuel tank inlet check valve (icv), a fuel odor…
- 10021356Jun 1, 2007Various driveability symptoms due to clogged fuel injectors, mil dtc's p0171, p0172, p0174, p0300, p1174, and p1175. *kb updated 08-03-07.
- 10014792Mar 1, 2005Perceived fuel economy and driver information center setting.
Fuel system: other model years
Other parts of the 2003 Isuzu Ascender
9 complaintsExterior lighting
7 complaintsTransmission and drivetrain
4 complaintsBrakes
3 complaintsBody and structure
3 complaintsEngine cooling
2 complaintsSteering
2 complaintsAir bags
1 complaintsLatches, locks and linkages
1 complaintsSeat belts
1 complaintsSeats
1 complaintsSuspension
1 complaints
← All problems reported for the 2003 Isuzu Ascender
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology