AI Damage2003 Isuzu Ascender: common problems
Owners of the 2003 Isuzu Ascender filed 35 complaints with NHTSA, most often about electrical system and exterior lighting. Details by component below, with sources.
Key figures
- Owner complaints
- 35
- involving a crash
- 2
What fails most often
- 1 Electrical system 26% of all complaints
- 2 Exterior lighting 20% of all complaints
- 3 Fuel system 17% of all complaints
- 4 Powertrain 11% of all complaints
- 5 Service brakes 9% of all complaints
- 6 Structure 9% of all complaints
- 7 Engine and cooling 6% of all complaints
- 8 Steering 6% of all complaints
- Electrical system: 9 complaints (26% of all).
- Exterior lighting: 7 complaints (20% of all).
- Fuel system: 6 complaints (17% of all).
- Powertrain: 4 complaints (11% of all).
- Service brakes: 3 complaints (9% of all), 1 of them with a crash reported by the owner.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 4.2 L · petrol · 6 cyl
- 5.3 L · petrol · 8 cyl
- automatic, 4-speed
Drive: RWD, AWD
Symptoms owners describe
How many of the 35 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 9 | 0 | 0 |
| Exterior lighting | 7 | 0 | 0 |
| Fuel system | 6 | 0 | 0 |
| Powertrain | 4 | 0 | 0 |
| Service brakes | 3 | 1 | 0 |
| Structure | 3 | 0 | 0 |
| Engine and cooling | 2 | 0 | 0 |
| Steering | 2 | 0 | 0 |
| Air bags | 1 | 1 | 0 |
| Latches, locks, linkages | 1 | 0 | 0 |
| Seat belts | 1 | 0 | 0 |
| Seats | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
| Tires | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The contact was wearing a seatbelt however injuries were sustain to the shoulders, back and neck. When the vehicle was taken to the dealership, they determined the vehicle was operating properly however the airbags did not deploy. The manufacturer has been alerted. A police report was filed at the scene.
The brake pedal went to the floor at a rapid pace when slowing down. This resulted in the vehicle not slowing down immediately. The abs warning light came on. The dealership replaced the abs module. The consumer had an accident after being told by the dealer that the brakes worked normally.
The contact stated that upon inspection, it was found that the brake line was perforated due to rust. The vehicle was taken to a private mechanic where the failure was confirmed. The vehicle was being repaired.
Power steering lines from the pump (high pressure and return lines) are corroding and now leaking.
He stated that intermittently while driving 50 mph the "ses" and "check engine" warning light illuminated on the instrument panel, then the vehicle stalled. As a consequence, the risk for a vehicle crash was increased.
Heater/ac fan kept going out. Was told it was relay switch. After several replacements, was told it was a fault in the ignition. Ignition was replaced. Fan now works. Now headlights go out intermittently. Tech's can't figure out why.
While trying to release the full-sized spare tire, the cable holding it up broke causing the tire to unexpectedly fall.
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.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 6,335 of 36,656 model years in the NHTSA data (top 17% most complained about).
On average one model year of the Ascender has 41 complaints (5 years in the data). This year has 35, about average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Isuzu Ascender?
Owner complaints to NHTSA most often mention: electrical system, exterior lighting, fuel system. Total complaints: 35. The most frequent symptoms in complaint texts: headlights and tail lights (17%), warning lights, check engine (11%), fuel system, fuel smell (9%).
How many service bulletins (TSB) were issued for the 2003 Isuzu Ascender?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2003 Isuzu Ascender from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2003 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.