NHTSA owner reports · September 18, 2026 snapshot.
Power Train complaints
62 reportsClear category filter60,000 miles · Apr 30, 2007
Power Train
I HAVE A 2004 TRAILBLAZER. I HAD TAKEN IT TO THE DEALERSHIP SERVICE CENTER ON SEVERAL OCCASIONS BECAUSE OF ISSUES WITH IT. THE SERVICE ENGINE LIGHT CAME ON ALL THE TIME. IT WOULD REV UP THE RPMS FOR NO REASON AND MAKE A WEIRD SOUND. IT WOULD NOT GO INTO 4 -WHEEL DRIVE OR OUT OF IT LIKE IT IS SUPPOSED TO. AND OTHER THINGS.…
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I HAVE A 2004 TRAILBLAZER. I HAD TAKEN IT TO THE DEALERSHIP SERVICE CENTER ON SEVERAL OCCASIONS BECAUSE OF ISSUES WITH IT. THE SERVICE ENGINE LIGHT CAME ON ALL THE TIME. IT WOULD REV UP THE RPMS FOR NO REASON AND MAKE A WEIRD SOUND. IT WOULD NOT GO INTO 4 -WHEEL DRIVE OR OUT OF IT LIKE IT IS SUPPOSED TO. AND OTHER THINGS. I HAD IT CHECKED, AND THEY SAID IT WAS ALL FINE AND THEY COULDNT DUPLICATE THE ERRORS. HOWEVER, SUBSEQUENTLY, THE TRANSMISSION HAS GONE OUT 4 TIMES IN THE LAST 4 MONTHS. I HAVE HAD IT REPLACED 3 TIMES. IT IS NOW AT THE TRANSMISSION SHOP AND THEY STATE THAT THERE IS A PROBLEM WITH THE ENGINE HAS TOO MUCH TRAVEL TO IT FRONT TO REAR. THE CRANK SHAFT SPECIFICALLY WHICH IS ALLOWING THE TORQUE CONVERTER TO PULL AWAY FROM THE FRONT PUMP AND BREAK THE ROTAR ASSEMBLY IN THE FRONT PUMP OF THE TRANSMISSION. THIS IS GETTING EXPENSIVE AND FRUSTRATING. ARE THERE ANY OTHER PEOPLE WHO HAVE THE SAME ISSUES OR IS THERE AN ISSUE WITH THE CRANK SHAFT? COULD IT BE THE TRANSMISSION IS BUILT WRONG? THIS IS REDICULOUS!! I HAVE ONLY 70,000 MILES ON IT. WHY WOULD I BUY CHEVY PRODUCTS IF THEY CONTINUE TO FAIL AT SUCH LOW MILES. *AK
NHTSA ODI #10189308
68,000 miles · Feb 7, 2007
Power Train
WE BOUGHT A 2004 CHEVY TRAILBLAZER BRAND NEW. WE HAD ALL SCHEDULED MAINTENANCE PERFORMED. THEN IN DECEMBER 29TH OF 2006 IN THE EVENING WE EXPERIENCED A LOSS OF THE TRANSMISSION IN THIRD GEAR. WE WERE TRYING TO MERGE ONTO A HIGHWAY AND WERE ALMOST REAR ENDED BY A SEMI-TRACTOR TRAILER TRUCK. I QUICKLY PULLED OFF TO THE BREAK DOWN …
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WE BOUGHT A 2004 CHEVY TRAILBLAZER BRAND NEW. WE HAD ALL SCHEDULED MAINTENANCE PERFORMED. THEN IN DECEMBER 29TH OF 2006 IN THE EVENING WE EXPERIENCED A LOSS OF THE TRANSMISSION IN THIRD GEAR. WE WERE TRYING TO MERGE ONTO A HIGHWAY AND WERE ALMOST REAR ENDED BY A SEMI-TRACTOR TRAILER TRUCK. I QUICKLY PULLED OFF TO THE BREAK DOWN LANE TO AVERT AN ACCIDENT. IT HAS BEEN ROUGHLY BEEN SIX WEEKS SINCE WE DROPPED THE VEHICLE OFF AT A AUTHORIZED CHEVY DEALER. OUR EXTENDED WARRANTY WANTS TO REBUILD THE TRANSMISSION. THE CHEVY SERVICE DEPARTMENT WANTS TO REPLACE IT. THEY ARE AT A STALEMATE. THIS VEHICLE HAD ONLY 68000 MILES ON IT. *JB
NHTSA ODI #10181848
71,300 miles · Jan 11, 2007
Power Train
WE BOUGHT OUR 04 TRAILBLAZER USED ABOUT A YEAR AND A HALF AGO. IT WAS OWNED BY ENTERPRISE BEFORE AND THEREFORE ALREADY HAD 30000 MILES ON IT BUT WE KNEW THAT IT WAS MAINTAINED WELL. IT IS NOW AT 71000 MILES AND WE HAVE DONE ALL RECOMMENDED MAINTENANCE. YESTERDAY, WHILE ON THE INTERSTATE THE TRANSMISSION LOST THIRD GEAR AND ABOVE…
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WE BOUGHT OUR 04 TRAILBLAZER USED ABOUT A YEAR AND A HALF AGO. IT WAS OWNED BY ENTERPRISE BEFORE AND THEREFORE ALREADY HAD 30000 MILES ON IT BUT WE KNEW THAT IT WAS MAINTAINED WELL. IT IS NOW AT 71000 MILES AND WE HAVE DONE ALL RECOMMENDED MAINTENANCE. YESTERDAY, WHILE ON THE INTERSTATE THE TRANSMISSION LOST THIRD GEAR AND ABOVE. THIS WAS DANGEROUS BUT LUCKILY I GOT OFF OF THE INTERSTATE WITH NO INCIDENCE. THIS MORNING WE TOOK THE TRUCK TO OUR LOCAL AND TRUSTED MECHANIC WHO DETERMINED THAT THE TRANSMISSION WAS SHOT. HE CALLED JASPER TO GET A PRICE ON A NEW TRANSMISSION AND DURING THAT CONVERSATION, JASPER INFORMED HIM THAT THEY HAVE DONE 15 UPGRADES TO THIS PARTICULAR GM TRANSMISSION AND THAT EVEN GM IS BUYING REPLACEMENT TRANSMISSIONS FROM THEM. I THINK THAT GM SHOULD CONSIDER SOME TYPE OF RECALL ON THE TRANSMISSIONS DUE TO THE OBVIOUS AMOUNT OF PROBLEMS THEY ARE CAUSING. NEEDLESS TO SAY.. MY WARRANTY IS EXPIRED AND I HAVE TO SHELL OUT $3000 TO REPAIR A 3 YR OLD VEHICLE. *JB
NHTSA ODI #10178417
42,000 miles · Jan 10, 2007
Engine And Engine CoolingPower Train
TL* - SOMETIME IN LATE SEPTEMBER 2006, WHILE DRIVING AT 65 MPH THE TRANSMISSION BEGAN TO SLIP. THE VEHICLE SOUNDED AS IF IT WANTED TO ACCELERATE, BUT COULDN'T. THE CONTACT'S VEHICLE CONTINUED TO HAVE THE FAILURE FOR ABOUT 10 SECONDS. THE VEHICLE ALSO HAD THE SAME TYPE OF FAILURE WHILE AT A STOP LIGHT. WHILE TRYING TO A…
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TL* - SOMETIME IN LATE SEPTEMBER 2006, WHILE DRIVING AT 65 MPH THE TRANSMISSION BEGAN TO SLIP. THE VEHICLE SOUNDED AS IF IT WANTED TO ACCELERATE, BUT COULDN'T. THE CONTACT'S VEHICLE CONTINUED TO HAVE THE FAILURE FOR ABOUT 10 SECONDS. THE VEHICLE ALSO HAD THE SAME TYPE OF FAILURE WHILE AT A STOP LIGHT. WHILE TRYING TO ACCELERATE THE VEHICLE'S SPEED DECREASED TO 5 MPH FOR ABOUT 20-30 SECONDS. ON 10/11/06 CONTACT TOOK THE VEHICLE TO THE DEALERSHIP. DEALERSHIP REPLACED THE EXHAUST CHECK VALVE. ON 10/17/06 VEHICLE CONTINUED TO HAVE THE SAME FAILURE AND THE ENGINE LIGHT WAS TURNING ON,. THE CONTACT TOOK THE VEHICLE TO THE DEALERSHIP WHERE THEY REPLACED THE OXYGEN SENSOR. THE CONTACT CONTINUED TO HAVE THE SAME INCIDENT WITH THE TRANSMISSION SLIPPING AND THE CHECK ENGINE LIGHT COMING ON. CONTACT TOOK THE VEHICLE TO THE DEALERSHIP ON 10/3106, AND THEY REPLACED THE VALVE BODY. IT CONTINUED TO HAVE THE SAME INCIDENT WITH THE TRANSMISSION SLIPPING, BUT THIS TIME THE ENGINE LIGHT WAS NOT SHOWING. HE TOOK THE VEHICLE TO THE DEALERSHIP ON 12/20/06, AND THEY STATED THAT THERE WASN'T ANYTHING WRONG WITH THE VEHICLE. THE CONTACT CURRENTLY HAS THE VEHICLE PARKED AT HOME AND DOES NOT PLAN TO DRIVE IT BECAUSE HE DOESN'T FEEL SAFE IN VEHICLE. *AK UPDATED 2/26/2007 - *NM
NHTSA ODI #10178305
Mileage unknown · Dec 10, 2006
Power Train
WHILE I'M DRIVING THE CAR WILL JUST TURN OFF. I CAN BE AT A LIGHT, TURNING, MERGING ONTO TRAFFIC OR JUST SITTING IN TRAFFIC. I'VE BEEN ABLE TO AVOID THREE ACCIDENT TO DATE. I DID BRING THE CAR IN TO THE DEALER - THEY FIXED IT. UNTIL IT HAPPENED THREE DAYS LATER. IT HAPPENS 6 OUT OF THE 7 DAYS A WEEK. *JB
NHTSA ODI #10175707
36,000 miles · Sep 6, 2006
Engine And Engine CoolingEquipmentPower Train
I HAVE HAD MY TRAIL BLAZER FOR 1 YR AND 1 MONTH. IN THAT TIME I HAVE HAD TO REPLACE FRONT AND BACK PADS AND ROTORS, BALL JOINTS, CATALYTIC (SP) CONVERTER, AND NOW THEY JUST TOLD ME I HAVE TO REPLACE THE HEAD GASKET ON THE MANIFOLD. WHAT THE HELL IS GOING ON WITH THIS VEHICLE. I NO LONGER FEEL SAFE DRIVING IT. THE OTHER DAY THE…
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I HAVE HAD MY TRAIL BLAZER FOR 1 YR AND 1 MONTH. IN THAT TIME I HAVE HAD TO REPLACE FRONT AND BACK PADS AND ROTORS, BALL JOINTS, CATALYTIC (SP) CONVERTER, AND NOW THEY JUST TOLD ME I HAVE TO REPLACE THE HEAD GASKET ON THE MANIFOLD. WHAT THE HELL IS GOING ON WITH THIS VEHICLE. I NO LONGER FEEL SAFE DRIVING IT. THE OTHER DAY THE RADIO JUST STOPPED PLAYING AND THEN THE SERVICE 4 WHEEL DRIVE LIGHT CAME ON. *NM
NHTSA ODI #10167431
Mileage unknown · Aug 11, 2006
Power TrainVehicle Speed Control
THE VEHICLE HAS STALLED OUT 3 TIMES IN THE PAST MONTH. CHECK ENGINE LIGHT CAME ON AND THEN REDUCED ENGINE POWER LIGHT. WE COULD ONLY GO 10 MPH. THANKFULLY WE WERE IN A RESIDENTIAL AREA AND NOT ON THE FREEWAY. DEALERSHIP SAID IT WAS A FAULTY ACCELERATOR POSITION MODULE AND THE PCM NEEDED TO BE REPROGRAMMED. LUCKY US WE ARE O…
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THE VEHICLE HAS STALLED OUT 3 TIMES IN THE PAST MONTH. CHECK ENGINE LIGHT CAME ON AND THEN REDUCED ENGINE POWER LIGHT. WE COULD ONLY GO 10 MPH. THANKFULLY WE WERE IN A RESIDENTIAL AREA AND NOT ON THE FREEWAY. DEALERSHIP SAID IT WAS A FAULTY ACCELERATOR POSITION MODULE AND THE PCM NEEDED TO BE REPROGRAMMED. LUCKY US WE ARE OVER IN MILES AND THIS IS NOT COVERED BY THE WARRANTY. *NM
NHTSA ODI #10165252
53,247 miles · Jul 31, 2006
Power Train
TRANSMISSION WENT OUT. *JB
NHTSA ODI #10163965
54,300 miles · May 28, 2006
Power Train
I OWN A 2004 CHEVROLET TRAILBLAZER AND THE TRANSMISSION RECENTLY FAILED, DUE TO CAUSES UNKNOWN. THIS CONCERNS ME BECAUSE I ONLY HAVE 54,000 MILES ON MY VEHICLE AND IT HAS RECEIVED ALL SCHEDULED MAINTENANCE. ALSO I'VE DONE SOME RESEARCH TO FIND OUT THAT IS A RECURRING ISSUE STARTING IN 2002 WITH THE TRAILBLAZER. I AM GOING TO …
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I OWN A 2004 CHEVROLET TRAILBLAZER AND THE TRANSMISSION RECENTLY FAILED, DUE TO CAUSES UNKNOWN. THIS CONCERNS ME BECAUSE I ONLY HAVE 54,000 MILES ON MY VEHICLE AND IT HAS RECEIVED ALL SCHEDULED MAINTENANCE. ALSO I'VE DONE SOME RESEARCH TO FIND OUT THAT IS A RECURRING ISSUE STARTING IN 2002 WITH THE TRAILBLAZER. I AM GOING TO CONTACT CHEVROLET FOR REPAIR BUT MY WARRANTY IS EXPIRED AND I AM SURE IS WILL HAVE TO PAY FOR ALL REPAIRS. *JB
NHTSA ODI #10158455
20,000 miles · Apr 25, 2006
Power Train
TRANSMISSION SLIPS WHEN ACCELERATING SUCH AS MERGING ONTO A HIGHWAY. HAS OCCURRED AT LEAST 10 TIMES. HAS BEEN TO DEALER 3 TIMES BUT SAY THEY CANNOT FIND A PROBLEM IF CHECK ENGINE LIGHT DOES NOT COME ON. HAS HAPPENED INTERMITTENTLY OVER A YEAR - VEHICLE HAS ONLY 27,000 ON IT. *JB
NHTSA ODI #10156091
NHTSA investigations
4RQ17002 · 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.
PE04032 · Brake Lamp Failure
Opened Apr 6, 2004 · Closed Aug 3, 2004
Status: closed (inferred from source dates) · Exterior Lighting:brake Lights
THE OFFICE OF DEFECTS INVESTIGATION (ODI) OPENED THIS INVESTIGATION ON MODEL YEAR (MY) 2002-04 CHEVROLET TRAILBLAZER VEHICLES.GM REPORTS THAT OTHER VEHICLES SHARING THIS PLATFORM AND BRAKE LAMP DESIGN ARE THE MY 2002-2004 CHEVROLET TRAILBLAZER EXT; GMC ENVOY, XL, XUV; OLDSMOBILE BRAVADA AND 2004 BUICK RAINIER.COMPLAINTS ALLEGE THAT THE REAR BRAKE LAMP DOES NOT OPERATE WHEN THE BRAKE PEDAL IS DEPRESSED.THERE IS NO INDICATION TO THE DRIVER FROM INSIDE THE VEHICLE THAT ONE OR MORE BRAKE LAMPS BULBS ARE NOT FUNCTIONING.GM FOUND THAT HEAT FROM THE BULB COULD DEFORM THE LAMP SOCKET, PRODUCE ELECTRICAL ARCING AND AN INOPERATIVE BULB.TO CORRECT THE CONDITION, GM CHANGED THE BULB TO A BULB THAT TRANSMITS LESS HEAT TO THE SOCKET AND CHANGED THE SOCKET TO A THERMOPLASTIC POLYMER TO IMPROVE THERMAL STABILITY.THESE CHANGES WERE IMPLEMENTED INTO PRODUCTION VEHICLES ON OCTOBER 1, 2003.GM IMPLEMENTED A SPECIAL POLICY BY NOTIFYING CONSUMERS THAT IF THEY SHOULD EXPERIENCE A BRAKE LAMP FAILURE TO GO TO THEIR GM DEALERSHIP TO HAVE THE CIRCUIT BOARD CONTAINING THE BRAKE LAMP REPLACED ALONG WITH NEW BULBS.THIS POLICY IS GOOD FOR THE FIRST 6 YEARS OR 72,000 MILES OF THE LIFE OF THE VEHICLE.ODI WILL UPGRADE THIS INVESTIGATION TO EA 04-021 AND INCLUDE THE ABOVE MENTIONED VEHICLES.
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