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Service bulletins for the 2004 Buick Regal

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.

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

By type

By component

By trouble code

Bulletins, newest first
31292004-11-03. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. A/C EVAPORATOR FREEZING. *TC
041420042004-09-17. Service bulletin. ELECTRICAL SYSTEM. WITH THE AC ON, LED APPEARS TO TOGGLE ON AND BACK OFF IN ONE UNIQUE CONDITION. THIS CONDITION IS THE HEADLAMPS ARE ON, INSTRUMENT PANEL LAMPS ARE DIMMED TO THE LOWEST EXTREME, DAYTIME CONDITIONS AND THE REAR DEFOG BUTTON IS TURNED ON AND OFF OR ALLOWED TIME TO TIMEOUT. ENGINEERING INVESTIGATED HAS DETERMINED THE CONDITION IS NORMAL. *TT
041320042004-09-17. Service bulletin. ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS. INSTRUMENT PANEL FUSE NUMBER TEN FAILURE. GM VOICEMAIL EXPRESS. *TT
040820042004-09-17. Service bulletin. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:ROTOR. THE CURRENT BRAKE ROTOR MINIMUM ALLOWABLE THICKNESS AFTER REFINISH, OR MINIMUM THICKNESS SPECIFICATION, FOUND IN THE PAST SERVICE MANUAL APPLICATIONS ARE INCORRECT. PLEASE USE CORRECT INFORMATION AS FOLLOWS. *TT
012320042004-09-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. TRANSMISSION FLUID LEAK FROM REVERSE SERVO COVER AT AMBIENT TEMPERATURES. TRANSMISSION FLUID MAY BE DETECTED ON THE LOWER PAIN RAIL OR CASE SIDE. MOST LEAK REPORTS HAVE BEEN FOUND DURING PREDELIVERY INSPECTION. GM VOICEMAIL EXPRESS. *TT
30112004-08-25. Service bulletin. EQUIPMENT. WHEN USING VOICE RECOGNITION DIALING, SOME NUMBERS OR COMMANDS MAY NOT BE UNDERSTOOD BY THE SYSTEM ESPECIALLY THE NUMBER TWO (2). *TT
30062004-08-24. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE MECHANICAL NOISE. VARIOUS MODELS INCLUDING THE 2005 PONTIAC GRAND PRIX. *TT
30072004-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. 3.8L ENGINE OIL CONSUMPTION. *TT
0407300102004-08-14. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. REVISED CASE SIDE COVER REPLACEMENT PROCEDURE. *TT
040235004D2004-08-13. Service bulletin. STEERING. CLUNK NOISE FROM FRONT OF VEHICLE DURING TURNING MANEUVER/STEERING WHEEL ROTATION. *TT *NM
0408420102004-08-03. Service bulletin. EXTERIOR LIGHTING:FOG LIGHTS. LEFT AND/ OR RIGHT FOG LAMP MAY BE INOPERATIVE. *MJ
0406010172004-08-02. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. NEW UPPER INTAKE MANIFOLD AND GASKET KITS. *TT
00372D2004-06-09. Service bulletin. EQUIPMENT:ELECTRICAL. ONSTAR SYSTEM IS ATTEMPTING AND/OR COMPLETING PHONE CALLS WHICH THE OPERATOR OF THE VEHICLE DID NOT INITIATE. *TT
016702004-06-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). INCORRECT PCM (POWERTRAIN CONTROL MODULE) PART NUMBER SETTING DTC (DIAGNOSTIC TROUBLE CODE) P0135. *TT
016502004-06-04. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:WINDSHIELD:ELECTRICAL HEATING ELEMENT. MANUAL DUAL ZONE FAN AND MODE KNOB REPLACEMENT. SERVICE VME. *TT
016142004-06-04. Service bulletin. STRUCTURE. RUSTY OR CORRODED APPEARANCE ON UNDERCARRIAGE COMPONENTS.*MR
020272004-05-20. Service bulletin. ELECTRICAL SYSTEM. A/C ON LED INOPERATIVE OR APPEARS TO TOGGLE ON AND OFF. ALSO INCLUDING 2005 BUICK CENTURY AND 2005 BUICK REGAL. *MR
020382004-05-20. Service bulletin. ELECTRICAL SYSTEM. DIAGNOSTIC TROUBLE CODE B1000. *MR
020332004-05-19. Service bulletin. ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS. HVAC INSTRUMENT PANEL FUSE 10 FAILURE. *MR
017932004-04-28. Service bulletin. EQUIPMENT. UNABLE TO PROGRAM KEYLESS ENTRY RKE OR COMMUNICATE WITH BCM. *MR
017152004-04-27. Service bulletin. POWER TRAIN. 4T65E TRANSMISSION FLUID LEAK FROM THE REVERSE SERVO COVER IN COLD WEATHER. *TT
030844005B2004-03-04. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW. POOR RADIO RECEPTION OR RADIO STATIC/ INCREASED INTERFERENCE WITH REAR WINDOW DEFOGGER ON OR SOME REAR WINDOW DEFOGGER GRIDS MAY BE INOPERATIVE. *TT
015052004-03-01. Service bulletin. FUEL SYSTEM, OTHER. LOOSE FUEL CAP MESSAGE AND DIAGNOSTIC TROUBLE CODE (DTC) P0440, P0455. *TT *MJ
015832004-02-25. Service bulletin. ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD. ENGINE WIRING HARNESS CAUSING MULTIPLE DRIVEABILITY CONCERNS DIAGNOSTIC TROUBLE CODES (DTCS). *TT *MJ
0308490212004-02-10. Service bulletin. STRUCTURE:BODY. CUP HOLDER MAY NOT RETAIN CUPS. *TT

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