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2004 Isuzu Ascender Recalls, Problems & Maintenance

The 2004 Isuzu Ascender carries 1 open NHTSA recall — most recently covering turn signal. Owners report 7 recurring issue clusters, led by “Fuel tank and filler neck leaks or fractures.” 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.

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1 Open Recall

Source: NHTSA

EXTERIOR LIGHTING:TURN SIGNAL

Campaign #05V198000 · May 5, 2005

Issue: ON CERTAIN TRUCKS AND SPORT UTILITY VEHICLES, THE DRIVER WISHING TO SIGNAL A TURN BY MOVING THE DIRECTIONAL SIGNAL LEVER, (UP OR DOWN) MAY CAUSE THE FRONT MARKER/TURN LIGHTS AND REAR TURN LIGHTS TO FLASH IN A MANNER SIMILAR TO HAZARD WARNING, RATHER THAN FLASHING ON THE DESIRED SIDE ONLY.

Risk: THE DRIVER MAY NOT BE ABLE TO CLEARLY SIGNAL THEIR INTENTIONS TO TURN, CHANGE TRAVEL LANES, OR POTENTIALLY WARN OTHERS OF AN IMPAIRED VEHICLE OPERATING CONDITION INCREASING THE RISK OF A CRASH.

Fix: DEALERS WILL REPLACE THE SUSPECT FLASHER MODULES WITH A NEW FLASHER MODULE DESIGNED WITH SEALED RELAYS AND MORE DURABLE CONTACT MATERIAL INSIDE OF THE RELAYS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 4, 2005. ISUZU BEGAN MAILING OWNER LETTERS ON AUGUST 4, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463, ISUZU AT 1-800-255-6727, BUICK AT 1-866-608-8080, AND OLDSMOBILE AT 1-800-630-6537.

Recall data refreshed Jul 20, 2026.

Known issues & problems for this vehicle

What drivers and federal regulators have officially reported about the 2004 Isuzu Ascender.

Reported to NHTSA

Fuel tank and filler neck leaks or fractures

FUEL SYSTEM, GASOLINE

13 NHTSA complaints · 2007-06 → 2016-07

“FUEL TANK LEAKS SPILLING FUEL AT ALL TIMES. HAVE BEEN TOLD BY MECHANIC THAT THE FUEL FILLER NECK WAS ULTRASONICALLY WELDED TO THE FUEL TANK AND THAT THE SEAM DID NOT HOLD”
— Owner report, NHTSA ODI #10291116
“FUEL TANK HAS LEAKING SEALS, WHICH IS CAUSING FUEL TO LEAK AND THE SMELL OF FUEL INTO CABIN AREA OF VEHICLE AND VEHICLE REJECTED DURING STATE INSPECTION”
— Owner report, NHTSA ODI #10836353
“RECALL HAS BEEN ISSUED ON FAULTY GAS TANK. HAD CAR INSPECTED BY ISUZU FACILITY 2/4/16 AND NEW PART(S) ORDERED”
— Owner report, NHTSA ODI #10883366

Read all complaints on NHTSA →

Instrument cluster and gauge malfunctions

ELECTRICAL SYSTEM

15 NHTSA complaints · 2006-01 → 2018-01

“INSTRUMENT CLUSTER FAILURE - ALL GAUGES HAVE FAILED INCLUDING THE SPEEDOMETER”
— Owner report, NHTSA ODI #10369087
“I OWN A 2004 ISUZU ASCENDER AND SEVERAL MONTHS AGO THE INSTRUMENT PANEL BEGAN WORKING ERRATICALLY, AND NOW, NOT AT ALL”
— Owner report, NHTSA ODI #10220480
“SPEEDOMETER SHOWING DIFFERENT SPEED THAN ACTUAL. CAR WILL SHOW IT IS GOING 50 MPH AND WILL BE ACTUALLY GOING 60MPH”
— Owner report, NHTSA ODI #10515769

Read all complaints on NHTSA →

Intermittent headlight outages

EXTERIOR LIGHTING

5 NHTSA complaints · 2012-06 → 2017-05

“WHILE MY WIFE WAS DRIVING THE VEHICLE BOTH LOWBEAM HEADLIGHTS JUST WENT OUT. SHE WAS FORCED TO DRIVE WITH HIGHBEAMS TO GET HOME”
— Owner report, NHTSA ODI #10691396
“VEHICLE HEADLIGHTS WORK VERY ERRATICALLY BOTH WHEN VEHICLE IS PARKED OR IN MOTION. LOW-BEAM LIGHTS WILL GO OFF ON A MOMENT'S NOTICE AND ONLY HIGH-BEAM LIGHTS WILL WORK”
— Owner report, NHTSA ODI #10788881
“THE LOW BEAMS ON MY HEADLIGHTS WILL GO OUT WITHOUT WARNING WHILE DRIVING AT NIGHT”
— Owner report, NHTSA ODI #10983646

Read all complaints on NHTSA →

Ignition and no-start problems

ELECTRICAL SYSTEM

4 NHTSA complaints · 2005-06 → 2016-02

“DT: WENT TO START THE VEHICLE AND IT WOULDN'T START BECAUSE LIGHT IN DASHBOARD WOULD SAY UNKNOWN DRIVER,”
— Owner report, NHTSA ODI #10125759
“HAD AUTO TOWED TO MIDAS AFTER INABILITY TO START, ATTEMPTED JUMP START, UNSUCCESSFUL”
— Owner report, NHTSA ODI #10817203
“AFTER STOPPING THE VEHICLE, THE CONTACT WAS UNABLE TO SHIFT GEARS AND THE IGNITION KEY FAILED TO REMOVE FROM THE IGNITION”
— Owner report, NHTSA ODI #10824522

Read all complaints on NHTSA →

Seat belt fit and adjustment

SEAT BELTS

3 NHTSA complaints · 2004-02 → 2005-10

“THE DESIGN OF THE VEHICLE'S SEAT BELTS ARE INADEQUATE FOR SHORT OR SMALL PEOPLE”
— Owner report, NHTSA ODI #10055866
“MY WIFE IS 5'4" TALL, AND THE SEAT BELT BOTH DRIVER AND PASSAGERS SLIDES UP AROUND HER NECK AND RIGHT UNDERARM”
— Owner report, NHTSA ODI #10096370
“THEY CAN NOT BE ADJUSTED TO ACCOMMODATE PEOPLE WHO ARE TALLER OR SHORTER”
— Owner report, NHTSA ODI #10139420

Read all complaints on NHTSA →

Tire failure and balance complaints

TIRES

3 NHTSA complaints · 2004-10 → 2007-08

“PULLED OVER ,AND TIRE HAD EXPLODED”
— Owner report, NHTSA ODI #10125778
“THE TIRE FAILURE OCCURRED WHILE DRIVING EASTBOUND I-10 IN THE RIGHT LANE, APPROX. 40 MILES WEST OF PHOENIX AZ”
— Owner report, NHTSA ODI #10198503
“TIRES ARE OF POOR QAULITY, FREQUENTLY NEEDS TO BE FORCE BALANCED.*AK”
— Owner report, NHTSA ODI #10097947

Read all complaints on NHTSA →

Driver door switch and control module faults

ELECTRICAL SYSTEM

3 NHTSA complaints · 2012-08 → 2015-05

“THE CONTACT STATED THAT THE DRIVER'S SIDE DOOR CONTROL FAILED”
— Owner report, NHTSA ODI #10544388
“THE CONTACT STATED THAT THE SMOKE CAME FROM THE POWER SWITCH FOR THE FRONT DRIVER SIDE DOOR”
— Owner report, NHTSA ODI #10471671
“THE CONTACT ALSO NOTICED SMOKE AND FLAMES COMING FROM THE CONTROL PANEL OF THE ARM REST ON THE FRONT DRIVER SIDE DOOR”
— Owner report, NHTSA ODI #10721513

Read all complaints on NHTSA →

Note: NHTSA also opened 2 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.

Raw data + downloads for this vehicle →

Essential maintenance

Critical for safety and preventing major damage

Timing Belt (3.2L and 3.5L V6)

Every 75,000 mi

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.

Engine Oil & Filter

Every 3,750 mi

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.

Tire Rotation

Every 7,500 mi

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.

Brake Inspection

Every 7,500 mi

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.

Brake Fluid

Every 24,000 mi

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.

Important maintenance

Keeps your vehicle running smoothly and efficiently

Transfer Case & Differential Fluid (4WD models)

Every 30,000 mi

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.

Automatic Transmission Fluid

Every 45,000 mi

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.

Spark Plugs

Every 60,000 mi

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.

Engine Air Filter

Every 30,000 mi

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.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Coolant Replacement

Every 60,000 mi

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.

Battery & Charging System Test

Every 25,000 mi

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.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

26 crashes 1990–2024

How the 26 occupant deaths break down

18

driver deaths

8

passenger deaths

26

occupant deaths

Crash years covered: 1990–2024 This model year first appears in 2006 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.

Why we show driver deaths too

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.

0

complaints mentioning a crash

2

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 2004 Isuzu Ascender 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.

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