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Research · Sport Utility Vehicle - 2WD

2003 Isuzu AscenderRecalls, problems, MPG & safety

NHTSA lists 5 safety recalls and 35 owner complaints for the 2003 Isuzu Ascender. Most complaints involve electrical system (9) and exterior lighting (7). The EPA rates it 14–16 mpg combined.

Check a VINAdd to my garage
Combined MPG
14–16mpg
EPA · 4 versions
NHTSA overall
—
Not rated by NCAP
Safety recalls
5campaigns
Latest Oct 2005
Owner complaints
35
Top: electrical system
Fuel cost / yr
$3,900est.
EPA estimate, best version
01 —Recalls

Safety recalls

5 NHTSA campaigns · applies to some vehicles, check your VIN

Latches

Free remedy

CERTAIN SPORT UTILITY VEHICLES HAVE A REAR SIDE CLOSURE LATCH THAT MAY NOT LATCH OR UNLATCH DUE TO CORROSION CAUSED BY ROAD SPLASH, SUCH AS WATER AND ROAD SALT. THESE VEHICLES WERE ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE FOLLOWING STATES: CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN, AND THE DISTRICT OF COLUMBIA.

Latches/locks/linkagesReported Oct 27, 2005NHTSA 05V494000

Exterior lighting: turn signal

Free remedy

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.

Exterior lightingReported May 5, 2005NHTSA 05V198000

Visibility: windshield wiper

Free remedy

CERTAIN SPORT UTILITY VEHICLES HAVE WINDSHIELD WIPER SYSTEMS THAT WILL NOT TURN ON, CEASE OPERATION WHILE IN USE, FAIL TO TURN OFF/ON BY THEMSELVES (MOISTURE SENSITIVE WIPER SYSTEM), OR HAVE CONTINUOUS WINDSHIELD WASHER PUMP OPERATION BECAUSE THE PRESENCE OF WATER WITHIN THE WIPER MODULES CAN EITHER CAUSE A SHORT CIRCUIT OR CAN LEAD TO THE CORROSION OF COMPONENTS WITHIN THE MODULE.

VisibilityReported Feb 4, 2004NHTSA 04V061000
See all 5 recalls with remedies
Data from NHTSA Recalls API · synced Nov 11, 2026 · All recall detailsNHTSA vehicle page
02 —Complaints

Owner complaints by component

35 complaints filed with NHTSA · Jul 2003 – Nov 2013
  1. Electrical system9
  2. Exterior lighting7
  3. Fuel system, gasoline5
  4. Power train4
  5. Structure3
  6. Steering2
  7. Engine and engine cooling2
  8. Fuel system, other2
  9. Service brakes, hydraulic2

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

By model year

Complaints for each Ascender model year we’ve synced.

View as table
Model yearNHTSA complaints
200335
200464
20080
Crashes reported
2
Fires reported
0
Injuries reported
2
Deaths reported
0
Data from NHTSA Complaints API · synced Nov 11, 2026 · Full problem breakdownNHTSA vehicle page
03 —Common problems

What owners report most

Verbatim excerpts from NHTSA complaints, by component

Electrical system

9 reports
“SERVICE BULLETIN OR RECALL 2003 ISUZU ASCENDER. PROBLEM KEY STUCK IN THE IGNITION CAN NOT REMOVE SEEMS TO BE NORMAL PROBLEM FOR THIS MAKE AND MODEL . L HAVE BEEN READING THROUGH FORUM COMPLAINTS ON THE INTERNET. I AM CURIOUS IF THERE HAS BEEN A RECALL AND IF NOT WHY NOT. CAR COULD BE CAR JACK OR STOLEN BY NOT ABLE TO REMOVE THE KEY FROM THE IGNITION. THIS HAS BEEN A INTERMITTENT PROBLEM. *TR”
Owner complaint to NHTSAFiled Sep 6, 2010Electrical systemODI 10353980

Exterior lighting

7 reports
“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. *TR”
Owner complaint to NHTSAFiled Sep 20, 2009Electrical system, Exterior lightingODI 10284659

Fuel system, gasoline

5 reports
“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. *TR”
Owner complaint to NHTSAFiled Nov 9, 2008Fuel system, gasolineODI 10248047
All 2003 Ascender problemsSend a problem to a mechanic on findmechanic.ai
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026
04 —Key specs

Engines, transmissions & drive

4 versions rated by the EPA
EPA class
Sport Utility Vehicle - 2WD, Sport Utility Vehicle - 4WD
Engines
4.2L 6-cyl · 5.3L 8-cyl
Transmissions
Automatic 4-spd
Drive
Rear-Wheel Drive · 4-Wheel or All-Wheel Drive
Fuel
Regular Gasoline

Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.

Data from EPA fueleconomy.gov · synced Nov 11, 2026EPA listing
05 —Fuel economy

EPA fuel economy by version

City / highway / combined, annual fuel cost and CO₂
EPA
VersionCityHwyComb.Fuel / yrCO₂ g/mi
Ascender 2WD
Auto 4-spd, 6 cyl, 4.2 L · Rear-Wheel Drive
141916$3,900555
Ascender 2WD
Auto 4-spd, 8 cyl, 5.3 L · Rear-Wheel Drive
141815$4,150592
Ascender 4WD
Auto 4-spd, 6 cyl, 4.2 L · 4-Wheel or All-Wheel Drive
131915$4,150592
Ascender 4WD
Auto 4-spd, 8 cyl, 5.3 L · 4-Wheel or All-Wheel Drive
131614$4,450635
  • Ascender 2WD
    Auto 4-spd, 6 cyl, 4.2 L
    14 city · 19 hwy · $3,900/yr
    16
    mpg comb.
  • Ascender 2WD
    Auto 4-spd, 8 cyl, 5.3 L
    14 city · 18 hwy · $4,150/yr
    15
    mpg comb.
  • Ascender 4WD
    Auto 4-spd, 6 cyl, 4.2 L
    13 city · 19 hwy · $4,150/yr
    15
    mpg comb.
  • Ascender 4WD
    Auto 4-spd, 8 cyl, 5.3 L
    13 city · 16 hwy · $4,450/yr
    14
    mpg comb.
Estimate your fuel costCost of ownership
Data from EPA fueleconomy.gov · synced Nov 11, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
06 —Safety

NHTSA 5-Star Safety Ratings

New Car Assessment Program
NHTSA has not published 5-Star Safety Ratings for the 2003 Isuzu Ascender as of Nov 11, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Nov 11, 2026
07 —Maintenance

Maintenance basics

General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
ItemMilesTimeNote
Engine oil & filter5,000–10,000 mi6–12 monthsFollow the oil-life monitor if fitted
Tire rotation5,000–7,500 miEvery oil changeCheck pressure monthly
Engine air filter15,000–30,000 mi1–2 yearsSooner in dusty areas
Cabin air filter15,000–25,000 mi1–2 years
Brake fluid—2–3 yearsAbsorbs moisture over time
Coolant60,000–100,000 mi5–10 yearsLong-life coolants last longer
Spark plugs60,000–100,000 mi—Iridium/platinum plugs at the long end
12V battery—3–5 yearsHeat shortens battery life
  • Engine oil & filter5,000–10,000 mi
    6–12 months
  • Tire rotation5,000–7,500 mi
    Every oil change
  • Engine air filter15,000–30,000 mi
    1–2 years
  • Cabin air filter15,000–25,000 mi
    1–2 years
  • Brake fluid—
    2–3 years
  • Coolant60,000–100,000 mi
    5–10 years
  • Spark plugs60,000–100,000 mi
    —
  • 12V battery—
    3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
09 —FAQ

2003 Ascender questions

How many recalls does the 2003 Isuzu Ascender have?

5 safety recalls as of Nov 11, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.

What are the most common 2003 Isuzu Ascender problems?

Owners filed 35 complaints with NHTSA. The most-cited components are electrical system (9), exterior lighting (7), fuel system, gasoline (5). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.

What MPG does the 2003 Isuzu Ascender get?

The EPA rates the 2003 Isuzu Ascender at 14–16 mpg combined, depending on engine and drivetrain (4 versions rated).

Data from NHTSA & EPA · synced Nov 11, 2026