AI Damage2005 Isuzu Ascender: common problems
Owners of the 2005 Isuzu Ascender filed 64 complaints with NHTSA, most often about electrical system and fuel system. Details by component below, with sources.
Key figures
- Owner complaints
- 64
- involving a crash
- 3
What fails most often
- 1 Electrical system 42% of all complaints
- 2 Fuel system 28% of all complaints
- 3 Air bags 14% of all complaints
- 4 Fuel/propulsion system 9% of all complaints
- 5 Exterior lighting 8% of all complaints
- 6 Vehicle speed control 6% of all complaints
- 7 Engine and cooling 5% of all complaints
- 8 Powertrain 5% of all complaints
- Electrical system: 27 complaints (42% of all).
- Fuel system: 18 complaints (28% of all).
- Air bags: 9 complaints (14% of all), 2 of them with a crash reported by the owner.
- Fuel/propulsion system: 6 complaints (9% of all).
- Exterior lighting: 5 complaints (8% of all).
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 64 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 | 27 | 0 | 0 |
| Fuel system | 18 | 0 | 0 |
| Air bags | 9 | 2 | 0 |
| Fuel/propulsion system | 6 | 0 | 0 |
| Exterior lighting | 5 | 0 | 0 |
| Vehicle speed control | 4 | 0 | 0 |
| Engine and cooling | 3 | 0 | 0 |
| Powertrain | 3 | 0 | 0 |
| Visibility | 3 | 0 | 0 |
| Steering | 2 | 1 | 0 |
| Engine | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
| Tires | 1 | 1 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Once I realized I was alive, I was in awe that the airbag did not deploy. I spoke to a manager at isuzu in california. He requested the vin number and some other personal information and said if the insurance company adjuster saw any manufacturer defects, then the insurance company would contact isuzu.
Driving when my rear driver side tire exploded separated causing my ascender isuzu 2005 to serve and almost lose control and cause over $ 5,000 in damage.
They'll come back on usually when I get to where I'm going and park the car but driving on the highway at night and all of the sudden your headlights go out is extremely dangerous. On three different occasions both the high beam and low beams went out.
Smoke in the cabin, burning plastic/electrical smell, electrical connector failure, blower motor resistor pack interface connector electrical failure on 2005 isuzu ascender five (5) passenger vehicle
The wires on the driver side headlights melted. The contact took the vehicle to a certified mechanic who diagnosed that the intake manifold gasket was fractured and the headlights failed, all of which needed to be replaced.
The lights go off while driving at night. It is the same problem as with the ascender 2006-2008 recall, but does not include the 2005. The hdm has gone out. It has happened several times in the past 4 months only to go out and not come back on this last time 03/01/2016. I should not have to pay to have it replaced.
Fuel gage fluxuates reading empty when full at start up and at speed.
Vehicle's rear airbags deployed with out any cause. I was driving aprox. 5-8 mph turning into a parking lot and out of nowhere the vehicles air bags deployed without any warning. Upon the airbags deploying the seatbelts locked up completely.
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 4,654 of 36,656 model years in the NHTSA data (top 13% most complained about).
On average one model year of the Ascender has 41 complaints (5 years in the data). This year has 64, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
Other years of this model
Questions and answers
What are the most common problems with the 2005 Isuzu Ascender?
Owner complaints to NHTSA most often mention: electrical system, fuel system, air bags. Total complaints: 64. The most frequent symptoms in complaint texts: fuel system, fuel smell (19%), warning lights, check engine (14%), A/C or heater (6%).
How many service bulletins (TSB) were issued for the 2005 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 2005 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.
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.