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Service bulletins for the 2003 Chevrolet Trailblazer

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

682 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
015772004-02-26. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. RADIO DISPLAYS CALIBRATION ERROR AFTER REPLACING RADIO. *MN
015792004-02-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. OIL PAN BAFFLES DELETED. SIT BULLETIN 1413402. *TT
015782004-02-25. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. COOLING FAN OPERATION. SIT BULLETIN 1413381. *TT
015732004-02-25. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. RATTLE NOISE AND/OR TRANSMISSION FLUID LEAK FROM TRANSMISSION COOLER LINE CONTACT WITH CATALYTIC CONVERTER. *TT *MJ
00540B2004-02-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE OIL LEAK AT INTAKE GASKET. SIT BULLETIN 1412496. *TT
0810B2004-02-24. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. TICK NOISE AT IDLE. *TT
0308111002A2004-02-11. Service bulletin. STRUCTURE:BODY. PAINT CHIPPING BEHIND FRONT WHEELS/FRONT OF REAR WHEELS, DAMAGED LOWER DOOR/CLADDING AND ROCKER PANELS. *TT THIS SERVICE BULLETIN REPLACES 0308111002. *EH UPDATE. *TT
0308630032004-02-11. Service bulletin. STRUCTURE:BODY. RATTLE FROM FRONT OF VEHICLE. *TT
0308420142004-02-11. Service bulletin. EXTERIOR LIGHTING:TURN SIGNAL:FLASHER UNIT. NEW TURN SIGNAL FLASHER MODULE AVAILABILITY. *TT
0302350062004-02-10. Service bulletin. STEERING. REVISED STEERING WHEEL REPLACEMENT PROCEDURE. *TT
010730038B2004-02-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. THE SERVICE ENGINE SOON LAMP IS ILLUMINATED, NO 3RD AND 4TH GEAR, THE TRANSMISSION DOES NOT SHIFT CORRECTLY, THE TRANSMISSION FEELS LIKE IT SHIFTS TO NEUTRAL OR A LOSS OF DRIVE OCCURS. *TT
020309002B2004-02-10. Service bulletin. SUSPENSION. INTERMITTENT BOOM, RUMBLING NOISE AND / OR DISTURBANCE HEARD IN PASSENGER COMPARTMENT WHILE DRIVING AT HIGHWAY SPEEDS. *TT
0117032004-01-30. Service bulletin. SERVICE BRAKES, HYDRAULIC. FRONT BRAKE NOISE OR SQUEALING AFTER THE VEHICLES HAS SAT OVERNIGHT. GM VOICEMAIL EXPRESS. *TT
0121032004-01-30. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. ENGINE OVERHEAT CONDITION WITH LITTLE OR NO HEATER OUTPUT. OASIS *TT
0922032004-01-28. Service bulletin. EXTERIOR LIGHTING:TAIL LIGHTS:SWITCH. TAIL LAMP CIRCUIT BOARD PART NUMBER INFORMATION. GM VOICEMAIL LOG. *TT
1007032004-01-22. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INTERMITTENT HESITATION, STUMBLE OR IDLE STALL WITHIN MINUTES OF STARTING AFTER THE VEHICLE HAS BEEN SITTING FOR SEVERAL HOURS. GM VOICEMAIL LOG. *TT
030842006A2004-01-07. Service bulletin. EXTERIOR LIGHTING:TAIL LIGHTS:SWITCH. TAIL LAMP CIRCUIT BOARD NOW AVAILABLE FOR SERVICE USE. *TT
0306040572004-01-07. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INTERMITTENT HESITATION, STUMBLE OR IDLE STALL AFTER SOAK, HARSH 1-2 SHIFT, SLIPPING 1-2 SHIFT FOLLOWED BY A HARSH ENGAGEMENT. *TT
0308570042004-01-05. Service bulletin. STRUCTURE:BODY. WET FRONT FLOOR CARPET. *TT UPDATE. *TT UPDATE. *KB
0306040602004-01-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INFORMATION ON NEW SPARK PLUGS AND GAPPING. VARIOUS MODELS INCLUDING PONTIAC GTO 2004. *TT
020421006C2003-12-04. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). INOPERATIVE 4WD/AWD LAMPS, INOPERATIVE 4WD/AWD SYSTEM. *TT
0308640332003-12-03. Service bulletin. VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR. AVAILABILITY OF REPLACEMENT MIRROR ACTUATOR. *TT
0308640322003-12-03. Service bulletin. VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR. AVAILABILITY OF REPLACEMENT PARTS FOR OUTSIDE REARVIEW MIRROR. *TT
0306040552003-12-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. SERVICE ENGINE SOON/CHECK ENGINE LIGHT ILLUMINATED, MISFIRE OR ROUGHNESS, DIAGNOSTIC TROUBLE CODE (DTC) P0300 SET. *TT
014592003-11-24. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:WINDSHIELD:ELECTRICAL HEATING ELEMENT. HVAC MODE ACTUATOR CAM GEAR ALIGNMENT IS INCORRECT AFTER REPLACEMENT. *TT

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.