IllustrationTHE REAR TIRES ON THE CONSUMER'S 2004 CHEVROLET TRAILBLAZER WEAR OUT EVERY COUPLE THOUSAND MILES WHILE THE FRONT TIRES SHOW NO VISIBLE SIGNS OF WEAR. *NM IT WAS DISCOVERED THAT THE VEHICLE HAD A BENT DIFFERENTIAL. *JB
2004 Chevrolet Trailblazer
Owner reports · Recalls · Investigations
More warning signs than most Trailblazer years
Owner complaints for the 2004 Chevrolet Trailblazer are substantially higher than the model-year median of 87.5.
About this comparison →How this year compares
Owner complaints by model year
Compare all Trailblazer 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
880–25K
16325–50K
27450–75K
17675–100K
137100–150K
61150K+
899 reports with mileage · 182 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 627 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Exterior Lighting. Review the 101 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel System, Gasoline. Review the 93 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
56 crash reports31 fire reports47 injury reports
Power Train complaints
62 reportsSHORTLY AFTER I PURCHASED A 2004 CHEVY TRAILBLAZER I BEGAN TO HAVE PROBLEMS WITH A LOUD VIBRATION FROM THE UNDERCARRIAGE. IT HAS BEEN TO THE SHOP NUMEROUS TIMES BUT IS STILL NOT FIXED. RECENTLY THE VEHICLE BEGAN STALLING OUT AT ANY GIVEN TIME. DEALER COULD NOT REPLICATE. STILL DOES IT!!! AROUND THE SAME TIME MY TRANSMISSIO…
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SHORTLY AFTER I PURCHASED A 2004 CHEVY TRAILBLAZER I BEGAN TO HAVE PROBLEMS WITH A LOUD VIBRATION FROM THE UNDERCARRIAGE. IT HAS BEEN TO THE SHOP NUMEROUS TIMES BUT IS STILL NOT FIXED. RECENTLY THE VEHICLE BEGAN STALLING OUT AT ANY GIVEN TIME. DEALER COULD NOT REPLICATE. STILL DOES IT!!! AROUND THE SAME TIME MY TRANSMISSION WOULD SLIP. DEALER COULD NOT REPLICATE. STILL DOES IT!!! NOW I AM FEELING A LOT OF VIBRATION IN THE STEERING WHEEL WHEN I TURN. TALKED TO OTHER TB OWNERS AND I THINKING I WILL NEED TO REPLACE THE STRUTS. WHAT NEXT!! *NM
DT: THE CALLER SAID THAT WHEN SHE WOULD BE AT A LIGHT THE VEHICLE WOULD STALL. SHE WOULD HIT THE GAS PEDAL AND THE VEHICLE WOULD HESITATE BEFORE TAKING OFF. ENGINE SERVICE LIGHT CAME ON/OFF. ON JULY 25, 2005 DEALER CHECKED AND REPROGRAMMED AUTOMATIC TRANSMISSION CONTROL MODULE( PCM). ON JULY 29, 2005 DEALER CHECKED AND REPLA…
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DT: THE CALLER SAID THAT WHEN SHE WOULD BE AT A LIGHT THE VEHICLE WOULD STALL. SHE WOULD HIT THE GAS PEDAL AND THE VEHICLE WOULD HESITATE BEFORE TAKING OFF. ENGINE SERVICE LIGHT CAME ON/OFF. ON JULY 25, 2005 DEALER CHECKED AND REPROGRAMMED AUTOMATIC TRANSMISSION CONTROL MODULE( PCM). ON JULY 29, 2005 DEALER CHECKED AND REPLACED THE PCM AGAIN , AND ON AUGUST 1, 2005 DEALER REPLACED A 02 SENSOR. DEALER SAID THEY COULD KEEP AND DRIVE VEHICLE TO SEE IF THAT FIXED THE PROBLEM . DEALER WOULD NOT GIVE HER A TEMPORARY VEHICLE TO DRIVE WHILE SHE WAITED FOR HER VEHICLE TO BE WORKED ON. DEALER SAID THE 02 SENSOR WAS THE PROBLEM. WOULD NOT OFFER AN EXTENDED WARRANTY. DEALER WILL NOT GIVE HER ENOUGH MONEY FOR IT AS A TRADE IN. *AK
2004 CHEVROLET TRAILBLAZER (V6). VEHICLE SUDDENLY SHIFTS ITSELF INTO 4 WHEEL DRIVE LOW GEAR WITHOUT WARNING AND WITHOUT ANY ACTION BY THE DRIVER. VEHICLE WAS BROUGHT TO AUTHORIZED REPAIR CENTER AND DISMISSED AS DRIVER ERROR. SHIFTING ANY VEHICLE INTO 4 WD LOW REQUIRES A DEFINITIVE ACTION BY THE DRIVER OF THE VEHICLE. AN ACTI…
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2004 CHEVROLET TRAILBLAZER (V6). VEHICLE SUDDENLY SHIFTS ITSELF INTO 4 WHEEL DRIVE LOW GEAR WITHOUT WARNING AND WITHOUT ANY ACTION BY THE DRIVER. VEHICLE WAS BROUGHT TO AUTHORIZED REPAIR CENTER AND DISMISSED AS DRIVER ERROR. SHIFTING ANY VEHICLE INTO 4 WD LOW REQUIRES A DEFINITIVE ACTION BY THE DRIVER OF THE VEHICLE. AN ACTION THAT THE DRIVER WOULD KNOW THEY PERFORMED. THIS IS THE 3RD SUCH INCIDENT WITH GM VEHICLES MY COMPANY HAS HAD. ALL DISMISSED AS DRIVER ERROR. INVESTIGATIVE ACTION NEEDS TO BE TAKEN AT SOME LEVEL. OUR LOCAL DEALERS AND REPAIR CENTERS DON'T SEEM TO BE CONCERNED. *NM
THE VEHICLE SWITCHES FROM 2WD TO AWD ON ITS OWN. THIS CAUSES THE VEHICLE TO KLUNK AND BUCK. IT ALMOST FEELS LIKE SOMEONE IS HITTING THE VEHICLE FOM BEHIND. THIS HAPPENED SEVERAL TIMES BEFORE WE FIGURED OUT WHAT THE PROBLEM WAS. VEHICLE WAS REPAIRED AT THE DEALERSHIP. THIS WAS ONLY ONE OF TWENTY-ONE FAILURES I HAVE EXPERIENCE…
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THE VEHICLE SWITCHES FROM 2WD TO AWD ON ITS OWN. THIS CAUSES THE VEHICLE TO KLUNK AND BUCK. IT ALMOST FEELS LIKE SOMEONE IS HITTING THE VEHICLE FOM BEHIND. THIS HAPPENED SEVERAL TIMES BEFORE WE FIGURED OUT WHAT THE PROBLEM WAS. VEHICLE WAS REPAIRED AT THE DEALERSHIP. THIS WAS ONLY ONE OF TWENTY-ONE FAILURES I HAVE EXPERIENCED WITH THIS VEHICLE SINCE I PURCHASED IT IN MAY OF 2004- NOT TO MENTION MY SEVERE BACK PAIN THAT IS CAUSED FROM THE DRIVER'S SEAT. I HAVE OWNED 9 VEHICLES, AND HAVE NEVER WITNESSED SUCH POOR QUALITY IN A AUTOMOBILE. I AM SEEKING A BUY-BACK FROM GM.*AK
THE CHECK ENGINE LIGHT AND THE REDUCED ENGINE POWER LIGHT CAME ON THE FIRST TIME AND THE TRUCK HAD NO ACCELERATION. THERE WAS A CODE RECORDED WHEN SERVICE WAS PERFORMED AND PCM WAS REPROGRAMMED. THE NEXT 3 TIMES THE CHECK ENGINE LIGHT CAME ON AND THE TRUCK WOULD ONLY ACCELERATE IF THE RPM'S REVED UP TO 2, THEN THE TRUCK WOULD M…
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THE CHECK ENGINE LIGHT AND THE REDUCED ENGINE POWER LIGHT CAME ON THE FIRST TIME AND THE TRUCK HAD NO ACCELERATION. THERE WAS A CODE RECORDED WHEN SERVICE WAS PERFORMED AND PCM WAS REPROGRAMMED. THE NEXT 3 TIMES THE CHECK ENGINE LIGHT CAME ON AND THE TRUCK WOULD ONLY ACCELERATE IF THE RPM'S REVED UP TO 2, THEN THE TRUCK WOULD MOVE VERY SLOWLY. THE PROBLEM THEY FOUND THIS TIME WAS A FAULTY INGITION SWITCH (2 TIMES) A PROGRAM UPGRADE OF THE MOTHERBOARD OF THE TRUCK, AND THE TORK CONVERTER CLUTCH MODULE. WINDSHIELD WIPER BLADES STOPPED WORKING DURING A SNOW/RAIN STORM.*AK
PURCHASED NEW TRAILBLAZER IN MAY 04. WHEN VEHICLE HAD APPROXIMATELY 3,000 MILES ON IT, I STARTED GETTING A RATTLE OR LOUD BUZZ WHEN ACCELERATING AT APPROXIMATELY 25 PER HOURS JUST BEFORE THE VEHICLE SHIFTS. OCCASIONALLY, THE SHIFT IF JERKY. THE VEHICLE HAS TO BE WARM AND THE RATTLE OR BUZZ FIRST MANIFESTED ITSELF AFTER I TURNE…
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PURCHASED NEW TRAILBLAZER IN MAY 04. WHEN VEHICLE HAD APPROXIMATELY 3,000 MILES ON IT, I STARTED GETTING A RATTLE OR LOUD BUZZ WHEN ACCELERATING AT APPROXIMATELY 25 PER HOURS JUST BEFORE THE VEHICLE SHIFTS. OCCASIONALLY, THE SHIFT IF JERKY. THE VEHICLE HAS TO BE WARM AND THE RATTLE OR BUZZ FIRST MANIFESTED ITSELF AFTER I TURNED RIGHT AND ACCELERATED FROM A STOP. WHEN WARM, THIS SOUND IS REPEATED ALMOST EVERY TIME I TURN RIGHT AND ACCELERATE. WHEN WARM IS ALSO OCCURS WHEN I JUST ACCELERATE FROM A FULL STOP. OCCASIONALLY, IT WILL ALSO OCCUR AFTER A TIGHT LEFT TURN. I REPORTED IT TO THE DEALER AND THEY TOLD ME THE COMPUTER DID NOT SHOW ANYTHING WRONG. ON THE SECOND TRIP TO THE DEALER I REPORTED IT AGAIN. STILL NO FIX. THE NOISE IS VERY ANNOYING, BUT I CANNOT TELL THAT IT IS DOING DAMAGE. I CERTAINLY WOULD NOT HAVE BOUGHT THIS VEHICLE IF IT MADE THIS NOISE ON THE ROAD TEST. I AM ESTIMATING THE RATTLE OR BUZZ SOUND HAS OCCURRED AT LEAST 75 TIME TO DATE. *NM
WHEN ACCELERATING FROM A STOP DRIVE TRAIN HESITATES AND ENGINE COMES TO A NEAR STALL, AND THEN ACCELERATES. THIS DOES NOT OCCUR ON EVERY START, RANDOMLY. TOOK VEHICLE INTO DEALER WHO STATED THAT IT WAS NORMAL FOR THE TYPE OF DRIVE TRAIN . THEN THE DEALER REPROGRAMMED THE VEHICLE. AFTER ONE DAY OF DRIVING THE PROBLEM HAS BEGUN…
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WHEN ACCELERATING FROM A STOP DRIVE TRAIN HESITATES AND ENGINE COMES TO A NEAR STALL, AND THEN ACCELERATES. THIS DOES NOT OCCUR ON EVERY START, RANDOMLY. TOOK VEHICLE INTO DEALER WHO STATED THAT IT WAS NORMAL FOR THE TYPE OF DRIVE TRAIN . THEN THE DEALER REPROGRAMMED THE VEHICLE. AFTER ONE DAY OF DRIVING THE PROBLEM HAS BEGUN AGAIN. THIS HESITATION IS VERY DANGEROUS CROSSING TRAFFIC AND IN INTERSECTIONS.*AK
WHEN ATTEMPTING TO SHIFT GEARS THE GEAR SHIFT BOX LOCKED. AS A RESULT, VEHICLE ROLLED DOWN THE DRIVEWAY. CRASHING INTO A MAIL BOX. *AK
THE VEHICLE OPERATED NORMALLY UNTIL PART FAILURE. TRANSMISSION PRESSURE COOLING LINE CONNECTOR NOT IN PLACE PROPERLY,CAUSED AUTOMATIC TRANSMISSION FLUID TO SPRAY ON HOT EXHUAST MANIFOLD, STARTING A MAJOR ENGINE FIRE.THE VEHICLE WAS INSPECTED BY GENERAL MOTORS ADJUSTER, AND CONSIDERED A TOTAL LOSS.NO REPAIRS WERE ATTEMPTED. *…
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THE VEHICLE OPERATED NORMALLY UNTIL PART FAILURE. TRANSMISSION PRESSURE COOLING LINE CONNECTOR NOT IN PLACE PROPERLY,CAUSED AUTOMATIC TRANSMISSION FLUID TO SPRAY ON HOT EXHUAST MANIFOLD, STARTING A MAJOR ENGINE FIRE.THE VEHICLE WAS INSPECTED BY GENERAL MOTORS ADJUSTER, AND CONSIDERED A TOTAL LOSS.NO REPAIRS WERE ATTEMPTED. *AK
Official recalls
205V198000 · Exterior Lighting:turn Signal
May 5, 2005
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.
Consequence & remedy
Consequence: THE DRIVER MAY NOT BE ABLE TO CLEARLY SIGNAL THEIR INTENTIONS TO TURN, CHANGE TRAVEL LANES, OR POTENTIALLY WARN OTHERS OF AN IMPAIRED VEHICLE OPERATING CONDITION INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL REPLACE THE SUSPECT FLASHER MODULES WITH A NEW FLASHER MODULE DESIGNED WITH SEALED RELAYS AND MORE DURABLE CONTACT MATERIAL INSIDE OF THE RELAYS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 4, 2005. ISUZU BEGAN MAILING OWNER LETTERS ON AUGUST 4, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463, ISUZU AT 1-800-255-6727, BUICK AT 1-866-608-8080, AND OLDSMOBILE AT 1-800-630-6537.
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
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.