2004 Isuzu Ascender Problems

What owners report

Owners of the 2004 Isuzu Ascender report two dominant themes: a flaky instrument cluster (speedometer, tachometer, fuel and temperature gauges that stop, stick, or read wrong) and a fuel tank inlet/filler-neck area that cracks and lets fuel and fumes into the cabin. Most complaints come in at higher mileage, but both problems are also described on low-mileage vehicles, and several owners say the same symptoms appeared repeatedly after dealer repairs.

1. 1
   Electrical system

   Instrument cluster gauges fail or read wrong

   • 22 complaints (34%)
   • median 80,000 mi at 4.9 yrs old (17 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2004–2018

   Owners describe the speedometer, tachometer, fuel, oil-pressure and temperature gauges working intermittently, sticking at a fixed value, or going dead, sometimes followed by the whole cluster going dark. Several say the cluster was replaced or the computer reprogrammed, and some report the problem returning within minutes or days. A few note that other gauges in the same panel still worked, and one owner links the failure to a stepper motor diagnosis from an independent shop. Reported from under 6,000 to about 145,000 miles, with many complaints clustered between roughly 30,000 and 100,000 miles.

   1 related service bulletin

   What to check: On a test drive, watch every gauge for smooth movement and confirm the speedometer reads plausibly against a GPS or posted limits. Ask whether the instrument cluster or its stepper motors have ever been replaced.

   2 excerpts from owner complaints in NHTSA records

   “The speedometer in my 2004 Isuzu Ascender which is a GM product is giving false readings and shows higher and/or slower speeds than the correct speed. I am aware that this is a nationwide complaint among other GM product owners. The dealerships are refusing to fix it, citing out of warranty excuses and saying that it is not a safety issue. It is in fact, a safety issue and should be fixed at no cost to the consumer.”

   NHTSA complaint #10212477, filed 2007-12, 25,700 miles

   “Just to let you know. Gmc envoy, chevrolet trailblazer, buick rainier, oldsmobile bravada, saab 9-7x, Isuzu Ascender they are all exactly the same vehicle that has just been rebadged. I personally drive a 2004 Isuzu Ascender, and I can't get GM , chevy, or Isuzu to fix it without charging me $475. My tachometer always reads wrong. My speedometer sometimes reads wrong and my gas gauge does not give me the correct reading. This can be real dangerous. The speedometer issue is more wide spread than you guys think.”

   NHTSA complaint #10214347, filed 2008-01, 25,000 miles
2. 2
   Fuel system

   Fuel tank inlet/filler neck cracks, fuel smell

   • 13 complaints (20%)
   • median 80,000 mi at 8.0 yrs old (12 state mileage)
   • filed 2007–2016

   Complaints describe a cracked plastic inlet or weld where the fuel filler meets the tank, producing a strong gas smell inside and around the vehicle, drops of fuel on the ground after refueling, and difficulty filling the tank. Owners say dealers diagnosed a fractured inlet check valve or tank and replaced the tank, and several mention being told a bulletin existed but their vehicle did not qualify. Some also report check-engine codes and rough running alongside it. Reported from about 16,000 to 144,000 miles, often noticed while refueling or when the check-engine light came on.

   2 related service bulletins

   What to check: Smell around the filler door and inside the cabin after a fill-up, look for fuel residue or staining near the tank inlet, and ask whether the tank or inlet check valve has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “My check engine light came on and I took it in to have a diagnostic check and I was informed that my 2004 Isuzu Ascender had a crack in the gas tank due to faulty equipment. There are gas fumes in the car as well. I contacted the manufacturer who states that there are bulletins for this problem for the 2003 and 2004 ascenders however my vehicle will not be covered.”

   NHTSA complaint #10254243, filed 2009-01, 75,853 miles

   “My 2004 Isuzu Ascender required the fuel tank be replaced as there was a cracked weld on the fuel neck. Isuzu did have a service bulletin on this year model, but yet I was told my vehicle did not qualify or met the criteria.”

   NHTSA complaint #10265077, filed 2009-04, 80,601 miles
3. 3
   Exterior lighting

   Headlights and low beams cut out

   • 7 complaints (11%)
   • median 145,000 mi at 10.6 yrs old (7 state mileage, few)
   • filed 2006–2017

   Owners report low-beam headlights going out without warning while driving at night, sometimes one side and sometimes both, with high beams still working. A few describe burned or melted connectors at the back of the lamps, and some say replacing bulbs or sockets did not stop it. Complaints describe having to switch to high beams to get home. Mostly reported past 100,000 miles, often noticed on night drives.

   Recall 05V198000

   What to check: Check both low beams at night and look at the connectors behind the headlamps for discoloration or melted plastic; ask whether the lamp sockets or wiring have been replaced.

   2 excerpts from owner complaints in NHTSA records

   “While driving one night, my left headlight went out, first the dim, then the bright. My wife and I both smelled a smell like rubber burning, so I stopped the car and checked under the hood to detect the origin of the smell, but to no avail. Not much later that same night, my right headlight also burned out. Luckily, we were only 1 mile from our house and limped home. …”

   NHTSA complaint #10460444, filed 2012-06, 122,348 miles

   “While my wife was driving the vehicle both lowbeam headlights just went out. She was forced to drive with highbeams to get home. After replacing both lights and checking all fuses I am at a loss of what the problem is. We cannot drive this vehicle at night due to safety concerns.”

   NHTSA complaint #10691396, filed 2015-03, 122,344 miles
4. 4
   Electrical system

   Door modules, locks and windows fail

   • 5 complaints (8%)
   • median 99,000 mi at 9.4 yrs old (4 state mileage, few)
   • 1 mention a crash, fire or injury
   • filed 2005–2015

   Complaints describe power window switches and door control modules failing, windows scratching or stopping, and doors that will not latch or close on several attempts. One owner reported smoke and a burned power window switch in the driver's door, and others mention remote locks and interior chimes working erratically. Dealers reportedly diagnosed shorted modules or replaced switches, and some repairs were not completed. Reported from low mileage up to about 138,000 miles, with several cases around 80,000 to 110,000 miles.

   1 related service bulletin

   What to check: Cycle every window and lock from each door and open and close all doors several times, watching for slow windows, unusual smells, or latches that need repeated tries.

   2 excerpts from owner complaints in NHTSA records

   “I own a 2004 Isuzu Ascender. There has been a host of problems that I have had to deal with in the minimal 10 months that I have owned the vehicle. Two of the problems have yet to receive any type of fix from the local Isuzu service center. The first problem was the belt screaming every day. I took the vehicle in three times for the belt and they finally fixed it. The second problem is all four door windows. Debris consistently makes its way into the door and any time I roll down or roll up my windows my windows get severly scratched. …”

   NHTSA complaint #10126560, filed 2005-06, 11,250 miles

   “The radio, anti theft device, remote door locks and tail lights did not function properly in the consumer's 2004 Isuzu Ascender. The vehicle has been at the service dealer since dec 16, 2005 and the consumer was not given a time frame for repairs. The technician indicated that the problem seemed to be with the multi-relay and electrical system.”

   NHTSA complaint #10149740, filed 2006-01
5. 5
   Seat belts

   Seat belts ride high on the neck

   Mentioned in 4 of 58 sampled complaints

   Owners describe the front seat belts sitting against the neck rather than the shoulder, especially for shorter occupants, with no height adjustment because the belts anchor to the seat back. Complaints say the belt also crosses the stomach rather than the hips and cannot be adjusted for different body sizes. Reported on new and low-mileage vehicles, generally without a mileage listed.

   What to check: Sit in the driver and passenger seats and check where the shoulder belt crosses each occupant; confirm any belt height or anchor adjustments work.

   2 excerpts from owner complaints in NHTSA records

   “The safety belts on the vehicle for the driver and front passenger do not work properly. When you put the seat belts on they ride on the next of the person wearing them. They also do not fit properly across the chest of the person wearing them. They can not be adjusted to accommodate people who are taller or shorter. When I put the seat belt on it applies pressure to my neck it can not be adjusted to ride over my hips instead of my stomach.”

   NHTSA complaint #10139420, filed 2005-10

   “I have a concern on my new 2004 Isuzu ascesder seat belts. My wife is 5'4 tall, and the seat belt both driver and passagers slides up around her neck and right underarm. Can not keep the seat belts is place. No adjustment for seat belts for height. It is attached to the back of the seats. The concern is if we had to make a hard stop, then the seat belt would cause injury for sure. Presently she holds the seat belt away from her neck when driving the SUV, and it is her car. Something needs to be done about this problem before someone gets hurt. …”

   NHTSA complaint #10096370, filed 2004-10

Buying note. These are high-mileage vehicles now, so budget for a possible instrument cluster repair and inspect the fuel filler and tank area carefully for cracks or fuel smell. Have a mechanic check the headlight wiring and door electrics before purchase, and note that most of these symptoms appear in complaints rather than in the one listed recall.

Summary written with AI from a sample of 58 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.