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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 →

When problems were reported

Mileage at the reported incident

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 reports
Mileage unknown · Jan 3, 2010
Electrical SystemPower Train

THE PROBLEMS THAT ARE HAPPENING TO MY 2004 CHEVY TRAILBLAZER : I AM HAVING A WHINING NOISE IN THE FRONT END OF THE VEHICLE AND WHEN I TRY TO ENGAGE INTO 4WD THE SOUND WORSENS AND THERE IS A VIBRATION IN THE FRONT AS WELL THE WHINING ALMOST RESEMBLES A LOW SIREN SOUND. I AM ALSO HAVING A MAJOR MALFUNCTION WITH MY SPEEDOMETER SINC…

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THE PROBLEMS THAT ARE HAPPENING TO MY 2004 CHEVY TRAILBLAZER : I AM HAVING A WHINING NOISE IN THE FRONT END OF THE VEHICLE AND WHEN I TRY TO ENGAGE INTO 4WD THE SOUND WORSENS AND THERE IS A VIBRATION IN THE FRONT AS WELL THE WHINING ALMOST RESEMBLES A LOW SIREN SOUND. I AM ALSO HAVING A MAJOR MALFUNCTION WITH MY SPEEDOMETER SINCE THE WEATHER HAS GOTTEN COLDER??? I COULD ONLY BE MOVING 10MPH AND IT WILL REGISTER TO 120 OR EVEN SURPASS IT AND THEN GET STUCK, THE ONLY WAY TO UNSTICK IT IS TO SHUT THE CAR OFF AND KEEP RESTARTING IT UNTIL IT RESETS ITSELF BUT NOW IT IS STUCK AND WONT RESET, I WENT ONLINE TO SEE IF THERE WERE ANY RECALLS AND I ALL I FOUND OUT WAS THERE WERE TONS OF PEOPLE HAVING THE SAME ISSUES WITH THEIR TRAILBLAZERS AS I AM HAVING. THESE PROBLEMS ARE OCCURRING AT ALL DIFFERENT TIMES DURING THE LIFE OF THE CAR SOME PEOPLE HAVE THEM HAPPEN AROUND 30,000 MILES OR SOME 50 THOUSAND AND MYSELF THE SPEEDOMETER IS HAPPENING AROUND 72,000 MILES. THE SPEEDOMETER SEEMED TO START TO ACT UP ONCE THE WEATHER WAS COLDER. ITS A SHAME THEY WILL FIX THE LARGER SUV'S DUE TO A LAWSUIT BUT SINCE THIS IS A SMALLER SUV IT'S NOT COVERED. WE HAVE TRIED TO REPLACE THE WHEEL BEARINGS IN THE TRUCK FOR THE FRONT END NOISE TO ONLY FIND THE NOISE DID NOT DISAPPEAR AFTER READING MANY OF OTHER COMPLAINTS FROM OTHERS IT SEEMS THIS COULD BE THE TRANSFER CASE ON THE TRUCK. I AM NOT GOING TO KEEP REPLACING PART AFTER PART TO ONLY FIND OUT ITS THE DRIVE TRAIN AND SOMETHING SHOULD BE DONE ABOUT THIS. *TR

NHTSA ODI #10297869

70,000 miles · Jan 2, 2010
Electrical System

THIS TRAIL BLAZER HAS BEEN A LEMON EVERY SINCE I BOUGHT IT.FIRST TWO BATTERIES KEPT SWELLING UP AND SMOKING AND THEN IT WOULDN'T START. I REPLACED THE ALTERNATOR. THEN THE MOTOR THREW A ROD. I PUT ANOTHER MOTOR IN IT. THEN THE CHECK ENGINE LIGHT CAME ON. I TOOK IT AND HAD IT PUT ON A MACHINE TO CHECK IT OUT. IT CANNOT BE CHECKE…

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THIS TRAIL BLAZER HAS BEEN A LEMON EVERY SINCE I BOUGHT IT.FIRST TWO BATTERIES KEPT SWELLING UP AND SMOKING AND THEN IT WOULDN'T START. I REPLACED THE ALTERNATOR. THEN THE MOTOR THREW A ROD. I PUT ANOTHER MOTOR IN IT. THEN THE CHECK ENGINE LIGHT CAME ON. I TOOK IT AND HAD IT PUT ON A MACHINE TO CHECK IT OUT. IT CANNOT BE CHECKED BECAUSE THE MACHINE READS THAT THE COMPUTER IS DEAD. IT STALLS EVERY NOW AND THEN AND GETS HORRIBLE GAS MILEAGE. I REPLACED THE GAS CAP BUT IT DIDN'T HELP. NOW THE TRANSMISSION HAS WENT OUT OF IT. PREVIOUSLY IT AUTOMATICALLY LOCKED THE DOORS WHEN IT WAS RUNNING LOCKING ME OUT. THERE SHOULD BE A RECALL ON ALL THESE ELECTRIC PROBLEMS. I DO NOT HAVE ANY MONEY TO FIX THESE PROBLEMS YET I HAVE 16 MORE MONTHS TO PAY ON THIS TRUCK. I'VE ALWAYS BOUGHT CHEVROLET'S BUT I WILL NEVER BUY ANOTHER ONE AND SO WILL A LOT OF OTHER PEOPLE. IF THEY CAN'T STAND BEHIND THERE VEHICLE'S THEIR NO GOOD FOR ANYTHING. ALL THESE DIFFERENT PROBLEMS STARTED AT DIFFERENT DATES. I ALSO HAD TO PUT A NEW EXHAUST SYSTEM ON IT. I DON'T KNOW HOW IT IS STILL RUNNING WITH THE COMPUTER DEAD. *TR

NHTSA ODI #10297791

75,000 miles · Dec 31, 2009
Electrical System

TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. WHILE DRIVING APPROXIMATELY 65 MPH HE NOTICED THAT THE SPEEDOMETER AND OIL PRESSURE GAUGES DISPLAYED INACCURATE READINGS. THE INSTRUMENT PANEL AND CENTER RADIO/CD PLAYER CONSOLE OVERHEATED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR INSPECTION. THE VEHICLE HAS NOT BEE…

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TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. WHILE DRIVING APPROXIMATELY 65 MPH HE NOTICED THAT THE SPEEDOMETER AND OIL PRESSURE GAUGES DISPLAYED INACCURATE READINGS. THE INSTRUMENT PANEL AND CENTER RADIO/CD PLAYER CONSOLE OVERHEATED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR INSPECTION. THE VEHICLE HAS NOT BEEN REPAIRED FOR THE FAILURE AND THE CAUSE OF FAILURE HAS NOT BEEN DETERMINED. THE FAILURE MILEAGE WAS 75,000. UPDATED 01/27/10. *LJ THE CONSUMER TOOK THE VEHICLE TO ANOTHER DEALERSHIP AND UPON INSPECTION THE MODULE THAT CONTROLLED THE GAUGES WAS DEFECTIVE. UPDATED 01/28/10.*JB

NHTSA ODI #10297693

585,000 miles · Dec 30, 2009
Electrical System

OCT 10,2009 58500 MILE ON TRAILBLAZER. DRIVING FROM WORK PASS A POLICE RUNNING 110 MPH. I WAS ONLY GOING ABOUT 50 MPH. THEN THE TACH STARTED MESSING UP TOO. STILL ONGOING PROBLEM. CAN GM HAVE A RECALL TO FIX ALL THESE COMPLAINTS. THEY HAVE FIX OTHER MODEL DOING THE SAME THING. *TR

NHTSA ODI #10297471

90,100 miles · Dec 29, 2009
Electrical System

THE TACHOMETER NEEDLE POINTS STRAIGHT DOWN AND DOES NOT RESPOND TO ENGINE SPEED. ACCORDING TO INFORMATION ONLINE, THE PROBLEM WILL PROGRESS TO THE OTHER GAUGES INSIDE THE INSTRUMENT PANEL OF MY VEHICLE. IT WILL BE A SAFETY ISSUE WHEN THE SPEEDOMETER STOPS WORKING. GM HAS MADE REPAIRS FOR SOME MODELS BUT NOT THE TRAILBLAZER. …

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THE TACHOMETER NEEDLE POINTS STRAIGHT DOWN AND DOES NOT RESPOND TO ENGINE SPEED. ACCORDING TO INFORMATION ONLINE, THE PROBLEM WILL PROGRESS TO THE OTHER GAUGES INSIDE THE INSTRUMENT PANEL OF MY VEHICLE. IT WILL BE A SAFETY ISSUE WHEN THE SPEEDOMETER STOPS WORKING. GM HAS MADE REPAIRS FOR SOME MODELS BUT NOT THE TRAILBLAZER. *TR

NHTSA ODI #10297443

60,000 miles · Dec 29, 2009
Electrical System

TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. ALL OF THE GAUGES ON THE INSTRUMENT CONTROL PANEL FAILED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR INSPECTION. THE FAILURES WERE CONTRIBUTED TO THE INSTRUMENT PANEL CLUSTER. THE VEHICLE HAS NOT BEEN REPAIRED AT THIS TIME. THE FAILURE MILEAGE WAS 60,000. THE CURREN…

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TL* THE CONTACT OWNS A 2004 CHEVROLET TRAILBLAZER. ALL OF THE GAUGES ON THE INSTRUMENT CONTROL PANEL FAILED. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER FOR INSPECTION. THE FAILURES WERE CONTRIBUTED TO THE INSTRUMENT PANEL CLUSTER. THE VEHICLE HAS NOT BEEN REPAIRED AT THIS TIME. THE FAILURE MILEAGE WAS 60,000. THE CURRENT MILEAGE WAS 100,000. THE VIN WAS UNAVAILABLE.

NHTSA ODI #10297293

56,000 miles · Dec 29, 2009
Electrical System

I OWN A 2004 CHEVY TRAILBLAZER THAT RECENTLY HAS BEGAN TO GIVE ME PROBLEMS WITH THE INSTRUMENT PANEL NOT READING CORRECTLY. MY SPEEDOMETER SITS AT 0 EVEN WHEN I'M DOING 65 MPH. MY TACH READS THE SAME. UPON CHECKING THIS OUT, I FOUND THAT THIS IS A ONGOING PROBLEM WITH THIS PARTICULAR VEHICLE THAT GM HAS NO RECALL AS OF TO DATE. …

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I OWN A 2004 CHEVY TRAILBLAZER THAT RECENTLY HAS BEGAN TO GIVE ME PROBLEMS WITH THE INSTRUMENT PANEL NOT READING CORRECTLY. MY SPEEDOMETER SITS AT 0 EVEN WHEN I'M DOING 65 MPH. MY TACH READS THE SAME. UPON CHECKING THIS OUT, I FOUND THAT THIS IS A ONGOING PROBLEM WITH THIS PARTICULAR VEHICLE THAT GM HAS NO RECALL AS OF TO DATE. OTHER HAVE ISSUES WITH THEIR GAS,VOLTMETERS AND OIP PRESSURE GAUGES. I FIND THESE ISSUES NOT ONLY ANNOYING BUT UNSAFE WHILE GOING DOWN THE FREEWAY NOT KNOWING IF YOUR SPEED IS CORRECT. THE AVERAGE COST OF REPAIRS FOR THIS IS ABOUT $500 TO $700. THERE ARE MANY OF THESE CASES GOING ON WITH THIS PARTICULAR VEHICLE. A SAFETY RECALL WOULD BE NICE. *TR

NHTSA ODI #10297281

81,000 miles · Dec 27, 2009
Power Train

2004 CHEVY TRAILBLAZER WITH 80,000 MILES, TRANSMISSION WENT OUT WHILE ON INTERSTATE, COULD NOT GET SPEED ABOVE 25 MILES PER HOUR. *TR

NHTSA ODI #10297056

82,700 miles · Dec 26, 2009
Electrical System

2004 CHEVY TRAIL BLAZER, SPEEDOMETER, TACHOMETER AND GAS GAUGE ALL FAILED WHILE ON THE ROAD. A SPEEDOMETER IS A MUST. I SAW ON THE NET WHERE THIS IS NOT AN UNCOMMON PROBLEM AND THE SITE SAID THAT GM HAS ALREADY WON A LAW SUIT BUT HAS NOT ISSUED A RECALL. *TR

NHTSA ODI #10296976

98,000 miles · Dec 21, 2009
Electrical System

INSTRUMENT PANEL (SPEEDOMETERS, GAS GAUGE AND WATER TEMP GAUGE) ON MY 2004 CHEVY TRAILBLAZER LT-A IS DEFECTIVE BUT CHEVY WILL NOT RECALL AND FIX THIS PROBLEM EVEN THOUGH THEY HAVE RECALLED AND REPAIRED OTHERS MODELS WITH THIS PROBLEM. *TR

NHTSA ODI #10296593

Official recalls

2

05V198000 · 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

4

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.

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.