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Service bulletins for the 2004 Buick Century

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.

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

By type

By component

By trouble code

Bulletins, newest first
040604066A2004-12-28. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. CLUNK/BANG FROM REAR OF VEHICLE. *TT
31022004-11-05. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. SERVICE VME 01-04 VEHICLE EQUIPPED WITH 4T65E AUTOMATIC TRANSMISSION 4T65E TRANSMISSION VALVE BODY INSPECTION PROCEDURE. (TO INCLUDE 2004 PONTIAC AZTEC) *SC ALL 2001 - 2006 PASSENGER VEHICLES WITH 4T65E TRANSAXLE. *TT
30972004-11-05. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. HVAC SIDE TO SIDE TEMPERATURE DIFFERENCE. *SC
31202004-11-04. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). ONSTAR CENTER UNABLE TO PERFORM REMOTE DIAGNOSTIC. (2004-2005 CHEVROLET YUKON, 2005 CHEVROLET TRAILBLAZER, 2002, 2003, 2005 BUICK RAINIER, 2005 CHEVROLET EXPRESS VAN, AND 2005 CADILLAC SEVILLE) *SC
31292004-11-03. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. A/C EVAPORATOR FREEZING. *TC
3125A2004-11-02. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). UNABLE TO CONTACT ONSTAR IN ALASKA *TC
3050A2004-10-13. Service bulletin. EQUIPMENT. 02-05 ONSTAR EQUIPPED VEHICLES EMITTING BEEPING NOISE BEFORE CONNECTING TO ONSTAR. *TT
30472004-10-08. Service bulletin. EQUIPMENT. 99 THROUGH 05 YEAR VEHICLES, EQUIPPED WITH THREE-BUTTON ONSTAR SYSTEMS. *TT
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
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
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
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
017932004-04-28. Service bulletin. EQUIPMENT. UNABLE TO PROGRAM KEYLESS ENTRY RKE OR COMMUNICATE WITH BCM. *MR
017402004-04-27. Service bulletin. ELECTRICAL SYSTEM:WIRING. CROSS INJECTOR WIRES CAUSING MISFIRE AT STEADY STATE SPEED AND RPM, MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED, AND A P0300 SET. SIT BULLETIN 1460291. *TT
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
015272004-02-28. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. A WHISTLE TYPE NOISE COMING FROM THE ENGINE. SIT BULLETIN 1406534. *TT
0917032004-01-27. Service bulletin. ELECTRICAL SYSTEM. INSTRUMENT PANEL CLUSTER FUNCTION INTERMITTENTLY INOPERATIVE, ESPECIALLY FUEL GAUGE OR PRINDEL, INTERMITTENT ENGINE NO CRANK OR NO START WITH A SECURITY LIGHT ON, CANNOT REMOVE THE TRANSAXLE SELECTOR LEVER FROM THE PARK POSITION, AND SCS, ANTI-LOCK BRAKE SYSTEM (ABS) OR TRACTION CONTROL SYSTEM (TCS) LIGHTS ON WITH DIAGNOSTIC TROUBLE CODES (DTCS) B1422, B2957 OR B2958. GM VOICEMAIL LOG. *TT
1009032004-01-22. Service bulletin. ELECTRICAL SYSTEM. REPLACEMENT OF A BODY CONTROL MODULE (BCM) OR IGNITION SWITCH DUE TO LACK OF IGNITION ONE OR IGNITION ZERO VOLTAGE. GM VOICEMAIL LOG. *TT
030849018B2004-01-07. Service bulletin. STRUCTURE:BODY. BROKEN CONSOLE OR STORAGE COMPARTMENT LID LATCH. *TT UPDATED *EH

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