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Research · Sport Utility Vehicle - 2WD

2003 Chevrolet Trailblazer ExtRecalls, problems, MPG & safety

NHTSA lists 3 safety recalls and 1,255 owner complaints for the 2003 Chevrolet Trailblazer Ext. Most complaints involve electrical system (377) and fuel system, gasoline (197). 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
3campaigns
Latest Oct 2005
Owner complaints
1,255
Top: electrical system
Fuel cost / yr
$3,900est.
EPA estimate, best version
01 —Recalls

Safety recalls

3 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: brake lights

Free remedy

ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME INOPERATIVE.

Exterior lightingReported Nov 1, 2004NHTSA 04V527000

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 04V046000
Data from NHTSA Recalls API · synced Nov 10, 2026 · All recall detailsNHTSA vehicle page
02 —Complaints

Owner complaints by component

1,255 complaints filed with NHTSA · Aug 2002 – Mar 2023
  1. Electrical system377
  2. Fuel system, gasoline197
  3. Power train153
  4. Exterior lighting105
  5. Visibility90
  6. Engine and engine cooling84
  7. Structure65
  8. Fuel/propulsion system65
  9. Air bags64

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 Trailblazer Ext model year we’ve synced.

View as table
Model yearNHTSA complaints
20021,268
20031,255
20041,357
20051,703
20061,313
Crashes reported
76
Fires reported
20
Injuries reported
80
Deaths reported
2
Data from NHTSA Complaints API · synced Nov 10, 2026 · Full problem breakdownNHTSA vehicle page
03 —Common problems

What owners report most

Verbatim excerpts from NHTSA complaints, by component

Electrical system

377 reports7 crashes13 fires
“Transmission doesn’t have 3rd or 4th gear. Vehicle was smoking under hood. Found out after buying it it has flood damage. Mechanic said there was water in the transmission when inspected. Vehicle needs catylic converter sensor and vehicle has bad ground wire. Seller didn’t inform me of any of these issues and he said it was in good shape and very reliable.”
Owner complaint to NHTSAFiled Mar 1, 2023Electrical system, Service brakes, EngineODI 11509655

Fuel system, gasoline

197 reports1 fire
“ON 12/15/15 I DROPPED OFF MY 2003 CHEVY TRAILBLAZER BASED ON A BULLETIN THAT I RECEIVED FROM CHEVY - GM SPECIAL COVERAGE PROGRAM #14423. THERE WAS A SMELL OF FUEL WHILE REFUELING. ON 12/16/15 THE DEALERSHIP NOTIFIED ME THAT THE FUEL TANK WAS INDEED DEFECTIVE AND THAT IT NEEDED TO BE REPLACED. THEY SAID THAT THEY WOULD ORDER THE PART AND HOLD THE VEHICLE UNTIL THE PART CAME IN SINCE THE VEHICLE WAS NOT SAFE TO DRIVE. LATER THAT DAY THE DEALERSHIP STATED THE PART WOULD NOT BE AVAILABLE UNTIL THE MIDDLE OF FEB.2016 AND THAT I WOULD HAVE TO LEAVE THE VEHICLE IN THEIR LOT. THAT WAS EXTREMELY UPSETTING NEWS SINCE NOW I WAS NOT GOING TO HAVE MY VEHICLE FOR SEVERAL MONTHS WITHOUT A REPLACEMENT. I HAVE BEEN IN TOUCH WITH THE DEALERSHIP ([XXX] (SERVICE ADVISOR), [XXX] (PARTS MANAGER), [XXX] (SERVICE DIRECTOR), AND [XXX] , (PARTS DEPT. SUPERVISOR) AS WELL AS CHEVY CUSTOMER SERVICE (CASE # [XXX]). TODAY IS MARCH 4, 2016 AND THE PART IS STILL NOT AVAILABLE. I HAVE BEEN WITH OUT MY TRAILBLAZER FOR ALMOST 3 MONTHS. THE DEALERSHIP AND CHEVY CUSTOMER SERVICE STILL HAVE "NO IDEA" WHEN THE PART WILL BE AVAILABLE. THEY NOW TELL ME MAYBE MAY 2016. CAN YOU HELP EXPEDITE THIS CASE…”
Owner complaint to NHTSAFiled Mar 14, 2016Fuel system, gasolineODI 10849631

Power train

153 reports5 crashes2 fires
“While driving my Trailblazer in A4WD on slippery road conditions, I went to pulled out of a parking lot and there was a loud sound like my whole front end fell out and the front end completely locked up. Almost causing an accident. I had to dial back to 2HI quickly to unlock to front end. There was no light indicating any problems. Been driving it 2HI since with out any problems. Still no service light or anything, but feels like I'm stuck in A4WD. Feels like there is a drag and a pulling to the right. Also using more gas since. It was a scary, afraid to try the 4x4 functions again. Another snow storm is on the way!”
Owner complaint to NHTSAFiled Jan 12, 2022Power trainODI 11447243
All 2003 Trailblazer Ext problemsSend a problem to a mechanic on findmechanic.ai
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 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 10, 2026EPA listing
05 —Fuel economy

EPA fuel economy by version

City / highway / combined, annual fuel cost and CO₂
EPA
VersionCityHwyComb.Fuel / yrCO₂ g/mi
TrailBlazer Ext 2WD
Auto 4-spd, 6 cyl, 4.2 L · Rear-Wheel Drive
141916$3,900555
TrailBlazer Ext 2WD
Auto 4-spd, 8 cyl, 5.3 L · Rear-Wheel Drive
141815$4,150592
TrailBlazer Ext 4WD
Auto 4-spd, 6 cyl, 4.2 L · 4-Wheel or All-Wheel Drive
131915$4,150592
TrailBlazer Ext 4WD
Auto 4-spd, 8 cyl, 5.3 L · 4-Wheel or All-Wheel Drive
131614$4,450635
Estimate your fuel costCost of ownership
Data from EPA fueleconomy.gov · synced Nov 10, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
06 —Safety

NHTSA 5-Star Safety Ratings

1 tested variant
NHTSA has not published 5-Star Safety Ratings for the 2003 Chevrolet Trailblazer Ext as of Nov 10, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Nov 10, 2026Vehicle 4898
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 Trailblazer Ext questions

How many recalls does the 2003 Chevrolet Trailblazer Ext have?

3 safety recalls as of Nov 10, 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 Chevrolet Trailblazer Ext problems?

Owners filed 1,255 complaints with NHTSA. The most-cited components are electrical system (377), fuel system, gasoline (197), power train (153). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.

What MPG does the 2003 Chevrolet Trailblazer Ext get?

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

Data from NHTSA & EPA · synced Nov 10, 2026