IllustrationINTERMITTENT PROBLEM WHERE THE ENGINE STALLS OR WILL NOT START. WHEN FAILURE OCCURS, INSTRUMENT PANEL BEGINS TO FLICKER LIGHTS AND GAUGES BOUNCE AROUND. *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
What owners actually said
1,081 reportsTL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. THE CONTACT STATED THAT THE HEADLIGHTS AND INTERIOR LIGHTS WOULD DIM INTERMITTENTLY. AT TIMES, THE HEADLIGHTS ARE SO DIM THAT HE CAN HARDLY SEE THE ROAD. THE DEALER WAS ABLE TO DUPLICATE THE FAILURE, HOWEVER, THEY WERE UNABLE TO PROVIDE A REMEDY. THE CONTACT WAS ADVISED NOT T…
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TL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. THE CONTACT STATED THAT THE HEADLIGHTS AND INTERIOR LIGHTS WOULD DIM INTERMITTENTLY. AT TIMES, THE HEADLIGHTS ARE SO DIM THAT HE CAN HARDLY SEE THE ROAD. THE DEALER WAS ABLE TO DUPLICATE THE FAILURE, HOWEVER, THEY WERE UNABLE TO PROVIDE A REMEDY. THE CONTACT WAS ADVISED NOT TO DRIVE THE VEHICLE AT NIGHT. THE CURRENT MILEAGE WAS 29,000 AND THE FAILURE MILEAGE WAS UNKNOWN. UPDATED 02-01-08. *KB
I HAVE OWNED THIS VEHICLE FOR 2 1/2 YEARS. THE FIRST PROBLEM WAS NOTICEABLE ONLY AT NIGHT WHEN THE WINDSHIELD GLARE WAS SO BAD ON THE FREEWAY THAT I COULD NOT SEE VERY WELL. WE HAD THE WINDSHIELD REPLACED. THE SECOND PROBLEM HAS BEEN ON-GOING FOR THE PAST SIX TO EIGHT MONTHS. THE SPEEDOMETER SOMETIMES WORKS, BUT IS USUALLY N…
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I HAVE OWNED THIS VEHICLE FOR 2 1/2 YEARS. THE FIRST PROBLEM WAS NOTICEABLE ONLY AT NIGHT WHEN THE WINDSHIELD GLARE WAS SO BAD ON THE FREEWAY THAT I COULD NOT SEE VERY WELL. WE HAD THE WINDSHIELD REPLACED. THE SECOND PROBLEM HAS BEEN ON-GOING FOR THE PAST SIX TO EIGHT MONTHS. THE SPEEDOMETER SOMETIMES WORKS, BUT IS USUALLY NOT VERY CORRECT, AND MOST OF THE TIME IT JUST PICKS A NUMBER AND SITS THERE FOR SEVERAL DAYS, WHETHER THE CAR IS RUNNING OR NOT. I USUALLY USE THE RPMS TO FIGURE OUT HOW FAST I AM GOING UNTIL MY MECHANIC CAN FIX IT FOR MORE THAN A WEEK AT A TIME. *TR
TL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. THE CONTACT STATED THAT THE HEADLIGHTS FLICKER WHEN THEY ARE ACTIVATED. THE LIGHTS ONLY FLICKER UPON DECELERATION. THE DEALER STATED THAT THE CAUSE OF FAILURE WAS THE ECM. THE CONTACT INFORMED THE DEALER NOT TO REPAIR THE VEHICLE. THE CURRENT MILEAGE IS 36,167 AND FAILURE MI…
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TL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. THE CONTACT STATED THAT THE HEADLIGHTS FLICKER WHEN THEY ARE ACTIVATED. THE LIGHTS ONLY FLICKER UPON DECELERATION. THE DEALER STATED THAT THE CAUSE OF FAILURE WAS THE ECM. THE CONTACT INFORMED THE DEALER NOT TO REPAIR THE VEHICLE. THE CURRENT MILEAGE IS 36,167 AND FAILURE MILEAGE WAS 36,000.
2004 CHEVROLTE TRAILBLAZER- IT CUTS OFF WHILE IN TRAFFIC. THERE IS A BLOG SITE WITH PEOPLE FROM ALL OVER THE COUNTRY COMPLIANING OF THE PROBLEM. DEALER SAYS, 'CANNOT DUPLICATE PROBLEM.' THE VEHICLE ALSO PRODUCES STRONG GASOLINE ODOR. DEALER SAYS, 'CANNOT DUPLICATE PROBLEM.' THIS PROBLEM IS ALSO LISTED ON THE BLOG COMPLAINT SI…
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2004 CHEVROLTE TRAILBLAZER- IT CUTS OFF WHILE IN TRAFFIC. THERE IS A BLOG SITE WITH PEOPLE FROM ALL OVER THE COUNTRY COMPLIANING OF THE PROBLEM. DEALER SAYS, 'CANNOT DUPLICATE PROBLEM.' THE VEHICLE ALSO PRODUCES STRONG GASOLINE ODOR. DEALER SAYS, 'CANNOT DUPLICATE PROBLEM.' THIS PROBLEM IS ALSO LISTED ON THE BLOG COMPLAINT SITE WITH A WARNING NOT TO LEAVE THE VEHICLE IN THE GARAGE OR THE FUMES WILL IGNITE.
DAILY FAILURE OF SEEDOMETER ON MY 2004 CHEVROLET TRAILBLAZER. THIS WAS IN ADDITION TO FAILURE OF THE FUEL GAUGE. THE SPEEDOMETER PROBLEM WAS INCONSISTENT AND MADE ME QUESTION THE ACTUAL SPEED AT EVERY MOMENT AND MADE ME MEASURE BASED ON OTHER TRAFFIC. IT IS A VERY DISTRACTING WAY TO DRIVE WITH ALL GAUGES MOVING AT TIMES AND THE…
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DAILY FAILURE OF SEEDOMETER ON MY 2004 CHEVROLET TRAILBLAZER. THIS WAS IN ADDITION TO FAILURE OF THE FUEL GAUGE. THE SPEEDOMETER PROBLEM WAS INCONSISTENT AND MADE ME QUESTION THE ACTUAL SPEED AT EVERY MOMENT AND MADE ME MEASURE BASED ON OTHER TRAFFIC. IT IS A VERY DISTRACTING WAY TO DRIVE WITH ALL GAUGES MOVING AT TIMES AND THEN RETURNING TO A FIXED SETTING. I HAD THE CLUSTERBOARD REPLACED BY THE DEALER WHO CLAIMED THIS WAS NOT A COMMON PROBLEM. INSTRUMENT PANELS ON 3 YEAR OLD CARS DO NOT FAIL UNLESS THERE IS A MANUFACTURING PROBLEM. PLEASE PREVENT ACCIDENTS IN THE FUTURE THIS IS NOT A SAFE WAY TO OPERATE A VEHICLE. *TR
AFTER COMING TO A STOP THE 2004 CHEVROLET TRAILBLAZER EXT STALLED. I BROUGHT IT TO THE SANTA MARIA HOME MOTORS TWICE. THE FIRST TIME THEY ADDRESSED THE PROBLEM WITH THE 30,000 MILE SERVICE AND SAID SEE IF IT HAPPENS AGAIN. THE TRAILBLAZER STALLED AGAIN SO THEY REPROGRAMED THE COMPUTER AND CHARGED ME $85 TO DO THIS. TODAY M…
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AFTER COMING TO A STOP THE 2004 CHEVROLET TRAILBLAZER EXT STALLED. I BROUGHT IT TO THE SANTA MARIA HOME MOTORS TWICE. THE FIRST TIME THEY ADDRESSED THE PROBLEM WITH THE 30,000 MILE SERVICE AND SAID SEE IF IT HAPPENS AGAIN. THE TRAILBLAZER STALLED AGAIN SO THEY REPROGRAMED THE COMPUTER AND CHARGED ME $85 TO DO THIS. TODAY MY WIFE WAS DRIVING THE TRAILBLAZER AND IT STALLED AGAIN. LIKE I HAVE TOLD THE SERVICE AGENT AT HOME MOTORS I WA S AFRAID THAT THIS WILL HAPPEN WHEN MY WIFE AND CHILDREN WERE CROSSING THE TRAIN TRACK, AND THEY COULD BE KILLED BY AN ONCOMING TRAIN. I WILL BRING THE TRAILBLAZER BACK TO THE DEALER TOMORROW. *AK
IN APRIL 2007, THE '04 TRAILBLAZER'S TRANSMISSION FAILED. AT THE TIME THE VEHICLE HAD LESS THAN 50,000 MILES. I DRIVE THE CAR VERY WELL - MOSTLY HIGHWAY MILES AS I COMMUTE FOR WORK - AND THE VEHICLE HAD NEVER BEEN USED TO TOW. THE TRANSMISSION WAS REPAIRED AT A CHEVROLET DEALER, AND LESS THAN 2 MONTHS LATER, THE TRANSMISSION…
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IN APRIL 2007, THE '04 TRAILBLAZER'S TRANSMISSION FAILED. AT THE TIME THE VEHICLE HAD LESS THAN 50,000 MILES. I DRIVE THE CAR VERY WELL - MOSTLY HIGHWAY MILES AS I COMMUTE FOR WORK - AND THE VEHICLE HAD NEVER BEEN USED TO TOW. THE TRANSMISSION WAS REPAIRED AT A CHEVROLET DEALER, AND LESS THAN 2 MONTHS LATER, THE TRANSMISSION FAILED AGAIN. I AM VERY UNSATISFIED WITH THE QUALITY OF THIS VEHICLE.*AK
TL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. ON JUNE 20, 2007, WHILE DRIVING 60 MPH, THE HOOD OF THE VEHICLE FLEW OPEN AND SMASHED THE WINDSHIELD. THE CONTACT COULD NOT SEE, BUT WAS ABLE TO PULL OFF THE ROAD SAFELY. HE DROVE APPROXIMATELY 10 MPH TO A MECHANIC WHO INSPECTED THE VEHICLE. THE MECHANIC COULD NOT FIND ANYTHI…
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TL*THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. ON JUNE 20, 2007, WHILE DRIVING 60 MPH, THE HOOD OF THE VEHICLE FLEW OPEN AND SMASHED THE WINDSHIELD. THE CONTACT COULD NOT SEE, BUT WAS ABLE TO PULL OFF THE ROAD SAFELY. HE DROVE APPROXIMATELY 10 MPH TO A MECHANIC WHO INSPECTED THE VEHICLE. THE MECHANIC COULD NOT FIND ANYTHING WRONG WITH THE VEHICLE. THE VEHICLE IS UNDER WARRANTY AND SERVICE HAS BEEN DENIED. THE VIN WAS UNKNOWN. THE CURRENT AND FAILURE MILEAGES WERE 31,662.
2004 CHEVROLET TRAILBLAZER 2 WHEEL DRIVE (2WD) TRANSMISSION FAILURE. TRANSMISSION FAILED WHILE UNDER NORMAL HIGHWAY OPERATING CONDITIONS, SPEED APPROXIMATELY 55 MPH, TWO LANE HIGHWAY, SURFACE CONDITIONS DRY, MILEAGE 25605. FAILURE PROCEEDED BY STRANGE NOISE, THEN COMPLETE DISENGAGEMENT / LOSS OF POWER. SERVICE ENGINE CHECK L…
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2004 CHEVROLET TRAILBLAZER 2 WHEEL DRIVE (2WD) TRANSMISSION FAILURE. TRANSMISSION FAILED WHILE UNDER NORMAL HIGHWAY OPERATING CONDITIONS, SPEED APPROXIMATELY 55 MPH, TWO LANE HIGHWAY, SURFACE CONDITIONS DRY, MILEAGE 25605. FAILURE PROCEEDED BY STRANGE NOISE, THEN COMPLETE DISENGAGEMENT / LOSS OF POWER. SERVICE ENGINE CHECK LIGHT ILLUMINATED; LATER DIAGNOSED BY GMC DEALORSHIP AS AN OPEN / LOOSE GAS CAP AS TH E CAUSE. THE VEHICLE WAS MANUEVERED / COASTED WITHOUT POWERTRAIN ASSISTANCE TO PARKING LOT ADJACENT TO THE HIGHWAY WITHOUT INJURY / INCIDENT. VEHICLE TOWED TO DEALORSHI ON . 6/15/07) INFORMED BY GM REPRESENTATIVE THAT COMPONENT REPLACEMENT / REPAIR NEEDED, SPECIFICS UNKNOWN, COST $2400 OF WHICH GM WOULD PAY 50%; MY COST $1200. *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.