IllustrationCRACKED EXHAUST MANIFOLD
2004 Chevrolet Trailblazer Ext
Owner reports · Recalls · Investigations
Limited comparison data
There is not enough comparable history to draw a useful model-year comparison.
About this comparison →How this year compares
Owner complaints by model year
Compare all Trailblazer Ext years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
170–25K
4925–50K
6550–75K
4675–100K
24100–150K
15150K+
216 reports with mileage · 45 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Electrical System. Review the 145 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel System, Gasoline. Review the 29 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 17 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
6 crash reports3 fire reports6 injury reports
Engine complaints
5 reportsVEHICLE'S REDUCED ENGINE POWER LIGHT COMES ON, AND VEHICLE LOSES POWER IN DANGEROUS PLACES. LOST OF PROBLEMS CONSIST OF SEVERAL PARTS HAVING TO DO WITH ACCELERATION. THIS PROBLEM HAPPENED SUDDENLY, ANDNIS A DANGER TO HIMAN SAFETY BECAUSE OF IT HAPPENING SEVERAL TIMES INCLUDING O N THE HIGHWAY.
STARTING ABOUT A FEW WEEKS AGO MY 2004 CHEVY TRAILBLAZER EXT HAS REEKED OF UNSPENT GASOLINE, AND THIS SMELL CONSUMES THE ENTIRE INTERIOR AND EXTERIOR OF THE VEHICLE. THE VEHICLE ALSO HAS SMALL LEAK BELOW RESERVOIR WHICH APPEARS TO BE LEAKING UNSPENT FUEL. CHEVY OFFERED A "SPECIAL COVERAGE" TO CORRECT THIS ISSUE (CORROSION ON TOP…
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STARTING ABOUT A FEW WEEKS AGO MY 2004 CHEVY TRAILBLAZER EXT HAS REEKED OF UNSPENT GASOLINE, AND THIS SMELL CONSUMES THE ENTIRE INTERIOR AND EXTERIOR OF THE VEHICLE. THE VEHICLE ALSO HAS SMALL LEAK BELOW RESERVOIR WHICH APPEARS TO BE LEAKING UNSPENT FUEL. CHEVY OFFERED A "SPECIAL COVERAGE" TO CORRECT THIS ISSUE (CORROSION ON TOP OF FUEL TANK RESERVOIR), HOWEVER IT ONLY COVERS VEHICLES UNDER 10 YEARS OF AGE AND UNDER 120K MILES. MY VEHICLE IS UNDER THAT MILEAGE, HOWEVER THIS REPAIR WILL NOT BE COVERED DUE TO AGE OF VEHICLE (MINE WAS ASSEMBLED IN MARCH). THIS ISSUE IS A MAJOR SAFETY CONCERN, AS ANY SMALL SPARK COULD CAUSE THIS VEHICLE TO IGNITE. I CANNOT CONTINUE TO DRIVE MY VEHICLE, AND FEEL THIS NEEDS TO BE RECTIFIED BEFORE IT CAUSES CATASTROPHIC LOSS (EITHER BUILDING OR PERSONAL). *TR
WHILE DRIVING ON THE HIGHWAY THERE WAS A BOOM UNDER THE HOOD. TWO MINUTES LATER THE CAR STARTED DECREASING POWER AND I HAD TO PULL OVER. BEFORE I COULD GET OUT TO LIFT THE HOOD, FIRE WAS SHOOTING FROM UNDER NEATH. *TR
I WAS WONDERING HOW COME THERE HASN'T BEEN A RECALL FOR THE CHEVY TRAILBLAZER EXT FOR THE THROTTLE BODY. I SEE THAT THEY HAVE RECALLS ON OTHER CHEVY CARS WITH THE SAME ISSUE. THIS IS A VERY DANGEROUS ISSUE AS WHEN THIS GOES YOU HAVE A REDUCE ENGINE LIGHT THAT COMES ON. WHICH I DIDN'T KNOW WHAT THAT MEANT UNTIL MY CAR WASN'T GOIN…
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I WAS WONDERING HOW COME THERE HASN'T BEEN A RECALL FOR THE CHEVY TRAILBLAZER EXT FOR THE THROTTLE BODY. I SEE THAT THEY HAVE RECALLS ON OTHER CHEVY CARS WITH THE SAME ISSUE. THIS IS A VERY DANGEROUS ISSUE AS WHEN THIS GOES YOU HAVE A REDUCE ENGINE LIGHT THAT COMES ON. WHICH I DIDN'T KNOW WHAT THAT MEANT UNTIL MY CAR WASN'T GOING ANY MORE THAN 20 MPH. THIS IS VERY DANGEROUS TO BE ON THE ROAD LIKE I WAS AND CAN'T SPEED UP OR BETTER YET TRYING TO TURN WHEN YOU DON'T HAVE THE POWER TO DO SO. ALSO, I SEE THAT THERE WERE ALSO ALOT OF ISSUES WITH THE SPEEDOMETER. WHICH ALSO I HAD THAT PROBLEM HAS TO PAY TOO MUCH MONEY TO GET THIS FIXED. AS HOW THEY WOULD SAY THEIR ARE MANUFACTURE PARTS WHICH DEFINITELY HURTS YOUR POCKETS. IF THEY KNOW THAT THEY HAVE THESE ISSUES THEY REALLY NEED TO RECTIFY BECAUSE BOTH OF THESE ISSUES CAUSE SOME SERIOUS PROBLEMS ON THE ROAD. I KNOW THEY ARE WEAR AND TEAR ON CARS / TRUCKS BUT IF YOU HAVE TOO MANY PEOPLE HAVING THE SAME PROBLEMS I THINK THEY SHOULD DO SOMETHING TO RESOLVE THESE ISSUES. *JS
Official recalls
104V527000 · Exterior Lighting:brake Lights
Nov 1, 2004
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.
Consequence & remedy
Consequence: AN INOPERATIVE BRAKE LAMP WILL NOT CONVEY THE DRIVER'S INTENTION OF STOPPING TO DRIVERS IN FOLLOWING VEHICLES, AND AN INOPERATIVE REAR TURN SIGNAL LAMP WILL NOT CONVEY THE DRIVER'S INTENTION TO TURN TO DRIVERS IN FOLLOWING VEHICLES. BOTH OF THESE FAILURES CAN INCREASE THE RISK OF A CRASH.
Remedy: DEALERS WILL INSPECT THE TAIL LAMP/STOP LAMP ASSEMBLIES, AND IF NECESSARY, REPLACE THEM. THE RECALL BEGAN ON NOVEMBER 22, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438, OLDSMOBILE AT 1-800-630-6537, BUICK AT 1-866-608-8080, OR GMC AT 1-866-996-9463.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
3RQ17002 · Loss Of Headlights
Opened Apr 24, 2017 · Closed Mar 29, 2021
Status: closed (inferred from source dates) · Exterior Lighting:headlights
The subject vehicles are model year (MY) 2002-2009 Chevrolet Trailblazer, GMC Envoy, 2004-2007 Buick Rainier, 2003-2008 Isuzu Ascender, 2005-2009 Saab 9-7X, 2002-2004 Oldsmobile Bravada, 2003-2006 Chevrolet SSR, 2005-2009 Buick Lacrosse, and 2006-2008 Pontiac Grand Prix. This scope includes the Trailblazer/Envoy variants: 2002-2006 Envoy XL/Trailblazer EXT and 2004-2005 Envoy XUV. The original scope of this investigation was expanded to include all vehicles equipped with the subject Headlight Driver Module (HDM). The focus of the investigation was to determine whether actions performed by General Motors adequately addressed any unreasonable risk to motor vehicle safety in the subject vehicles concerning the headlights and the HDM that controls them.Under normal electrical load and environmental conditions, the HDM can overheat inside the Underhood Electrical Center (UEC). This can cause the module to fail and result in a simultaneous loss of both low beam headlights and both daytime running lights (DRLs), often with no warning or prior detectability to the driver. This failure can be intermittent or permanent. No other exterior lights are affected. High beams, turn signals, brake lights, and reverse lights are still operational.General Motors addressed this issue with 2 recalls (14V755 & 15V519) and a special coverage program (N172091910). In view of the recalls and special coverage program implemented by GM and the vehicle high beams continuing to operate, ODI has tentatively concluded that the actions taken by GM mitigate any unreasonable risk to safety posed by HDM failure in the subject vehicles.Accordingly, the investigation is closed. The closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exist. The agency reserves the right to take additional action if warranted by new circumstances.The ODI reports cited above are available for review online at NHTSA.gov under the identification numbers in the attached document.
EA07009 · Fuel Pump Module Leaks Gasoline
Opened Jul 10, 2007 · Closed Aug 28, 2008
Status: closed (inferred from source dates) · Fuel System, Gasoline:delivery:fuel Pump
DURING THE COURSE OF THIS EA INVESTIGATION, ODI OBSERVED THAT THE MAJORITY OF THE COMPLAINTS (88%) AND WARRANTY CLAIMS (94%) WERE REPORTED FOR VEHICLES THAT ARE REGISTERED FOR USE IN THE SALT BELT REGION OF THE US.THIS AREA INCLUDES 20 STATES IN THE NORTHEAST, MID ATLANTIC AND THE MIDWEST REGIONS AND THE DISTRICT OF COLUMBIA.CONSUMERS IN THE SALT BELT REGION REPORTED TO ODI THAT THEY COULD SMELL FUEL VAPORS IN THEIR VEHICLES WHILE DRIVING.UPON FURTHER EXAMINATION OF THEIR VEHICLES, THEY DISCOVERED THAT FUEL VAPORS WERE COMING OUT OF THE TOP OF THE FUEL TANK. THIS CONDITION IS CAUSED BY CORROSION OF THE RETURN AND SENDER LINES OF THE FUEL PUMP MODULE.WATER AND ROAD SALT COLLECT ON TOP OF THE FUEL PUMP LEADING TO SMALL PINHOLES APPEARING ON THE FUEL LINES.FUEL MAY LEAK AND COLLECT ON TOP OF THE MODULE AND/OR SPILL ONTO THE GROUND.THE DATA EVALUATED UNDER THIS INVESTIGATION REFLECT A RELATIVELY LOW FREQUENCY OF OCCURRENCE THAT LARGELY ARISES IN SALT BELT STATES.GM HAS EXTENDED THE WARRANTY ON THE SUBJECT COMPONENT TO TEN YEARS OR 120,000 MILES.FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED AT THIS TIME; ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT NO SAFETY-RELATED DEFECT EXISTS.THE AGENCY RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.FOR ADDITIONAL INFORMATION SELECT DOCUMENT SEARCH.
EA04021 · Brake Lamp Failure
Opened Aug 3, 2004 · Closed Nov 4, 2004
Status: closed (inferred from source dates) · Exterior Lighting:brake Lights
GM STATES THAT SOME BRAKE/TAIL LAMP BULBS CAN PREMATURELY BECOME INOPERATIVE DUE TO MALFUNCTIONING BRAKE/TAIL LAMP SOCKETS.ON MARCH 2, 2004, GM INITIATED A 6-YEAR/72,000 MILE SPECIAL POLICY FOR 989,487 SUBJECT VEHICLES TO INSPECT AND REPLACE THE REAR BRAKE/TAIL LAMP BULB SOCKET ASSEMBLIES.ON APRIL 4, 2004, THE OFFICE OF DEFECTS INVESTIGATION (ODI) OPENED A PRELIMINARY EVALUATION (PE04-032) BASED ON CONSUMER COMPLAINTS ALLEGING BRAKE LIGHTS NOT OPERATING WHEN THE BRAKE PEDAL IS DEPRESSED.ON AUGUST 3, 2004 ODI UPGRADED PE04-032 TO AN ENGINEERING ANALYSIS (EA04-021).BY LETTER DATED OCTOBER 27, 2004 GM NOTIFIED NHTSA THAT IT WILL CONDUCT A SAFETY RECALL (NHTSA # 04V527) COVERING SUBJECT VEHICLES THAT WERE NOT ALREADY REPAIRED UNDER GM'S SPECIAL POLICY.MY 2004 SUBJECT VEHICLES BUILT AFTER AUGUST 8, 2003 CONTAIN IMPROVED BRAKE LAMP ASSEMBLIES AND ARE NOT INCLUDED IN THE RECALL.GM DEALERS WILL INSTALL THE IMPROVED BRAKE LAMP ASSEMBLY ON SUBJECT VEHICLES BUILT ON AUGUST 8, 2003 AND EARLIER.THE ACTION TAKEN BY GM IS SUFFICIENT TO RESOLVE THE ISSUES RAISED BY THIS INVESTIGATION.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.