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2004 Chevrolet Trailblazer Ext

Owner reports · Recalls · Investigations

Limited comparison data

There is not enough comparable history to draw a useful model-year comparison.

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When problems were reported

Mileage at the reported incident

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

What owners actually said

261 reports
142,000 miles · Jun 24, 2014
Power TrainService Brakes

DRIVING HOME FROM WORK BRAKES STARTED LOCKING UP DROVE HOME TOOK APART FRONT AN REAR BRAKES FOUND FRONT CALIPERS LOCKED UP CHANGED CALIPERS AN BRAKE PADS FRONT AN REAR TRIED TO BLEED BRAKES HAD A SPONGY PEDAL FILLED MASTER CYLINDER AN NOTICED BRAKE FLUID LEAKING UNDER MASTER CYLINDER CONNECTOR BEHIND FRONT DRIVER SIDE WHEEL NO P…

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DRIVING HOME FROM WORK BRAKES STARTED LOCKING UP DROVE HOME TOOK APART FRONT AN REAR BRAKES FOUND FRONT CALIPERS LOCKED UP CHANGED CALIPERS AN BRAKE PADS FRONT AN REAR TRIED TO BLEED BRAKES HAD A SPONGY PEDAL FILLED MASTER CYLINDER AN NOTICED BRAKE FLUID LEAKING UNDER MASTER CYLINDER CONNECTOR BEHIND FRONT DRIVER SIDE WHEEL NO PART TO FIX NO LISTING . CANNOT DRIVE CAR. THAT'S JUST ONE PROBLEM TRANSMISSION LINES ROTTED AN CHANGED 2 YEARS AGO . POWER STEERING COOLER ROTTED OUT LOST ALL POWER STEERING FLUID 1 MONTH AGO AN PUT AFTER MARKET COOLER IN . ALSO AIR CONDITIONER LINES ROTTED OUT CANNOT HOLD R34 COOLANT ANYMORE. *TR

NHTSA ODI #10605792

36,000 miles · Jun 10, 2014
Structure

THE FIRST TIME I WAS IN A CAR WASH AND HEARD A LOUD BANGING NOISE. I LOOKED BACK AND COULD SEE THE UPPER TAILGATE MOLDING FLOPPING IN THE WIND OF THE CAR WASH DRYER BEING HELD ON BY ONLY THE BRAKE WIRES. AT THAT TIME IT WAS REPLACED UNDER WARRANTY. 2ND REPLACEMENT ABOUT 3 YEARS LATER SAME THING. NOW RECENTLY I NOTICED AGAIN …

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THE FIRST TIME I WAS IN A CAR WASH AND HEARD A LOUD BANGING NOISE. I LOOKED BACK AND COULD SEE THE UPPER TAILGATE MOLDING FLOPPING IN THE WIND OF THE CAR WASH DRYER BEING HELD ON BY ONLY THE BRAKE WIRES. AT THAT TIME IT WAS REPLACED UNDER WARRANTY. 2ND REPLACEMENT ABOUT 3 YEARS LATER SAME THING. NOW RECENTLY I NOTICED AGAIN THAT ON THE DRIVERS SIDE SCREW ATTACHMENT ON THE MOLDING HAS BROKEN AWAY AGAIN AND IT'S MY RESPONSIBILITY TO SHELL OUT THE $500+ TO HAVE IT REPLACED AGAIN. I HAVE BEEN TOLD BY A GM DEALER IT IS PROBABLY CAUSED BY OUR WISCONSIN WINTERS WITH ACCUMULATION OF ICE & SNOW BUILD UP GETTING UNDER THE MOLDING AND ALSO WINDS USED TO DRYING VEHICLES IN CAR WASHES. CHEAP PLASTIC FOR THE MOUNTING SCREW TO GO THROUGH TO ATTACH IT TO THE VEHICLE. *TR

NHTSA ODI #10597484

135,000 miles · May 20, 2014
Electrical System

THE HEADLIGHTS INTERMITTENTLY WILL NOT WORK (LOWBEAM ONLY). IT HAPPENS AT NIGHT MANY TIMES AND I WILL HAVE TO DRIVE WITH THE BRIGHT LIGHTS OR FOG LIGHTS. SOMETIMES THE ENTIRE DASH LIGHTING WILL GO OUT AS WELL INCLUDING THE SPEEDOMETER. IT'S ALMOST AS IF THE ELECTRICAL PORTION OF THE IGNITION HAS FAILED. IT HAS BEEN HAPPENING INT…

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THE HEADLIGHTS INTERMITTENTLY WILL NOT WORK (LOWBEAM ONLY). IT HAPPENS AT NIGHT MANY TIMES AND I WILL HAVE TO DRIVE WITH THE BRIGHT LIGHTS OR FOG LIGHTS. SOMETIMES THE ENTIRE DASH LIGHTING WILL GO OUT AS WELL INCLUDING THE SPEEDOMETER. IT'S ALMOST AS IF THE ELECTRICAL PORTION OF THE IGNITION HAS FAILED. IT HAS BEEN HAPPENING INTERMITTENTLY FOR ABOUT A YEAR. *TR

NHTSA ODI #10592709

57,000 miles · Apr 26, 2014
Electrical System

INSTRUMENT PANEL/ SPEEDOMETER NO LONGER WORKS, FIRST INCIDENT HAPPENED MARCH OF 2010. AS OF 12/2013 THE VOLTAGE METER, RPM GAUGE, SPEEDOMETER HAVE COMPLETELY STOPPED WORKING. *TR

NHTSA ODI #10585102

83,000 miles · Apr 2, 2014
Electrical SystemExterior LightingFuel System, Gasoline

LIGHTS STARTED FLASHING, GAS GAUGE WENT TO EMPTY, CAR DIED. RESTARTED DROVE 1/4 MILE DIED. STEREO SYSTEM COMPLETELY FAILED (WHOLE UNIT). KEEPS POPPING CIRCUITS CHANGED OUT STILL DOING. CANNOT SHUT OFF HEAT DUE TO BANGING SOUND. CAR SPEEDS UP AND DOWN ON OWN. CANNOT READ GAS GAUGE CORRECTLY, NOT SURE HOW FULL TANK IS. *TR

NHTSA ODI #10576687

119,258 miles · Dec 31, 2013
EngineFire

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

NHTSA ODI #10557978

86,000 miles · Nov 7, 2013
Fuel/propulsion System

TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER EXT. THE CONTACT STATED HE BEGAN TO SMELL FUEL INSIDE OF THE VEHICLE. THE VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION WHERE THEY STATED THAT THE FUEL TANK NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS…

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TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER EXT. THE CONTACT STATED HE BEGAN TO SMELL FUEL INSIDE OF THE VEHICLE. THE VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION WHERE THEY STATED THAT THE FUEL TANK NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 86,000. THE VIN WAS UNAVAILABLE.

NHTSA ODI #10551366

161,000 miles · Oct 27, 2013
Fuel System, Gasoline

I HAVE A 2004 CHEVROLET TRAILBLAZER EXT WITH 161,000 MILES ON IT. A FEW WEEKS AGO I GOT TO NOTICING A REAL STRONG GAS ODOR IN AND AROUND THE VEHICLE. I HAVE DONE A LOT OF RESEARCH AND HAVE HAD THE VEHICLE CHECKED OUT AND CAME TO THE CONCLUSION THAT IT IS THE COMMON PROBLEM THAT IS AFFECTING MANY OTHER TRAILBLAZER EXT OWNERS. IT …

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I HAVE A 2004 CHEVROLET TRAILBLAZER EXT WITH 161,000 MILES ON IT. A FEW WEEKS AGO I GOT TO NOTICING A REAL STRONG GAS ODOR IN AND AROUND THE VEHICLE. I HAVE DONE A LOT OF RESEARCH AND HAVE HAD THE VEHICLE CHECKED OUT AND CAME TO THE CONCLUSION THAT IT IS THE COMMON PROBLEM THAT IS AFFECTING MANY OTHER TRAILBLAZER EXT OWNERS. IT IS THE FUEL TANK INLET CHECK VALVE AT THE TOP OF THE FUEL TANK. IN DOING MY RESEARCH I HAVE NOTICED THAT MANY PEOPLE HAVE HAD THIS ISSUE FIXED BY SOME RECALLS THAT HAVE BEEN ISSUED SO I TOOK THE VEHICLE TO MY LOCAL CHEVROLET DEALER TO FIND OUT ABOUT IT ONLY TO BE INFORMED THAT MINE IS 41,000 MILES PAST THE RECALL MILEAGE AND WILL COST UPWARDS OF $1,000 TO FIX. I AM WORRIED ABOUT A POSSIBLE FIRE OR EXPLOSION WITH THIS ISSUE. I AM AFRAID TO DRIVE IT TO WORK EVERY DAY AND TO USE IT TO TAKE MY CHILDREN TO SCHOOL. I JUST WISH THAT CHEVROLET WOULD FIX THIS SO I DON'T HAVE TO WORRY EVERY DAY ABOUT DRIVING IT. I DON'T FEEL THAT THERE SHOULD BE A MILEAGE RESTRICTION ON A SAFETY ISSUE THAT COULD RESULT IN DEATH OR GREAT INJURY. *TR

NHTSA ODI #10549713

205,000 miles · Aug 24, 2013
Air BagsCrashInjury

HIT A DEER AT 70 MPH ON I-70 IN KANSAS. I HIT IT FULL FORCE WITH THE FRONT END. HALF OF THE DEER WENT OVER, HALF THE DEER WENT UNDER. NOTHING LEFT BUT GUTS. FRONT END ON DRIVER SIDE DEPRESSED ABOUT A FOOT. WIFE AND I RECEIVED WHIP LASH, WIFE IS WORSE. BABY WAS OKAY. THE TRAILBLAZERS FRONT END WAS TOTALED. AIRBAGS DID NOT COME OU…

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HIT A DEER AT 70 MPH ON I-70 IN KANSAS. I HIT IT FULL FORCE WITH THE FRONT END. HALF OF THE DEER WENT OVER, HALF THE DEER WENT UNDER. NOTHING LEFT BUT GUTS. FRONT END ON DRIVER SIDE DEPRESSED ABOUT A FOOT. WIFE AND I RECEIVED WHIP LASH, WIFE IS WORSE. BABY WAS OKAY. THE TRAILBLAZERS FRONT END WAS TOTALED. AIRBAGS DID NOT COME OUT. GM STATED THAT IN ORDER FOR THE AIR BAGS TO WORK IN THIS MODEL IS THE BRAKES HAVE TO BE DEPRESSED 1/20TH OF A SECOND PRIOR TO IMPACT. THIS IS HOG WASH. BRAKES HAVE NOTHING TO DO WITH THE AIRBAGS. I DO NOT CARE ABOUT THE VEHICLE, MY CONCERNS ARE THE SAFETY FEATURES OF THIS VEHICLE. *TR

NHTSA ODI #10537051

165,454 miles · Aug 13, 2013
Fuel/propulsion System

SEVERAL MONTHS THE SMELL OF GASOLINE WAS VERY STRONG IN THE INTERIOR OF MY SUV. I DROVE IT ABOUT FIVE MILES FROM MY HOME WITH A FULL TANK, AS I DROVE IT THE SMELL BECAME MUCH STRONG, WHEN I REACHED MY DESTINATION A PERSON POINTED OUT TO ME THAT GASOLINE WAS POURING FROM THE BOTTOM OF MY TRUCK LIKE A WATER HOSE. I IMMEDIATELY R…

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SEVERAL MONTHS THE SMELL OF GASOLINE WAS VERY STRONG IN THE INTERIOR OF MY SUV. I DROVE IT ABOUT FIVE MILES FROM MY HOME WITH A FULL TANK, AS I DROVE IT THE SMELL BECAME MUCH STRONG, WHEN I REACHED MY DESTINATION A PERSON POINTED OUT TO ME THAT GASOLINE WAS POURING FROM THE BOTTOM OF MY TRUCK LIKE A WATER HOSE. I IMMEDIATELY RETURNED HOME TO PARK THE VEHICLE. AS I TRIED TO RECALL WHAT MAY HAVE OCCURRED, I REMEMBERED THAT TWO DAYS PRIOR TO THE INCIDENT I GOT AN OIL CHANGE; I ASSUMED THAT MAYBE THEY HAD DONE SOMETHING TO AGGRAVATE AN ALREADY EXISTING PROBLEM. AFTER THEY REVIEWED THEIR WORK, I WAS TOLD IT WAS A MANUFACTURES PROBLEM. I LATER TOOK THE VEHICLE TO WOLF CHEVROLET (NOW DEFUNCT DEALER). A DIAGNOSTIC WAS DONE AND IT WAS DETERMINED THAT THE GAS TANK MUST BE REPLACED WITH A COST OF $1192. AND THE SUV IS CONSIDERED "TOO DANGEROUS TO DRIVE". I THEN WENT TO ANOTHER AUTOMOTIVE ESTABLISHMENT AND WAS GIVEN THE SAME DIAGNOSIS. AFTER TAKING IN CONSIDERATION BOTH ESTIMATES AND MY NEED FOR TRANSPORTATION, I CONTACTED GM AND SPOKE WITH A CUSTOMER SERVICE REPRESENTATIVE WHO INFORMED ME THAT I NEEDED TO TAKE THE VEHICLE TO A CERTIFIED GM DEALER. I TOOK THE VEHICLE TO LOU BACHRODT IN CHERRY VALLEY, ILLINOIS AND WAS GIVEN THE SAME DIAGNOSIS. AFTERI RELAYED THE IINFORMATION TO THE GM REP, HE SAID THAT DUE TO THE AGE OF THE VEHICLE AND THE MILEAGE, GM WOULD NOT BE ABLE TO OFFER ME ANY COMPENSATION. HE SUGGESTED I PHONE LOU BACHRODT AND SEE IF THEY COULD ASSIST ME IN THE COST, THE SERVICE TECHNICIAN GAVE ME THE SAME STATEMENT; AGE AND MILEAGE. I AM WRITING BECAUSE FROM ALL INDICATIONS THIS PROBLEM IS NOT ONLY PREVALENT IN MY SUV BUT AFTER DOING RESEARCH, SEVERAL 2004 CHEVROLET TRAILBLAZER OWNERS HAVE EXPERIENCED SIMILAR PROBLEMS. IT IS MY BELIEF THAT CHEVROLET GM SHOULD TAKE OWNERSHIP FOR ALL OR SOME OF THIS PROBLEM. *TR

NHTSA ODI #10535221

Official recalls

1

04V527000 · 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

3

RQ17002 · 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.