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Service bulletins for the 2004 Hummer H2

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.

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

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By component

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Bulletins, newest first
30382004-10-14. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE TICK, RATTLE OR KNOCK NOISE AFTER CYLINDER HEAD GASKET REPLACEMENT ON THE 6.0L ENGINE. *TT
30392004-10-14. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. AUTO VOLUME INOPERATIVE AFTER IGNITION KEY IS CYCLED. VARIOUS MODELS INCLUDING 03-04 CADILLAC ALL FULL SIZE UTILITIES. *TT
3050A2004-10-13. Service bulletin. EQUIPMENT. 02-05 ONSTAR EQUIPPED VEHICLES EMITTING BEEPING NOISE BEFORE CONNECTING TO ONSTAR. *TT
30782004-10-13. Service bulletin. SUSPENSION:FRONT:WHEEL BEARING. GREASE LEAK FROM FRONT HUB BEARING. *TT UPDATE. *TT
3022A2004-10-13. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. 04 FULL SIZE TRUCKS AND UTILITIES WITH VIN G, N, T, V AND U ENGINES MAY HAVE A HIGH ALTITUDE, HIGH AMBIENT TEMPERATURE STALL. *TT
30602004-10-13. Service bulletin. EQUIPMENT. KEY CODE LOOK-UP. 1990-2005 ALL MAKES/MODELS INCLUDING HUMMER H2. *TT
30312004-10-07. Service bulletin. UNKNOWN OR OTHER. UPDATES TO SI AND THE PI NUMBERING PROCESS. SERVICE VME. 2004-05 PASSENGER VEHICLES AND LIGHT DUTY TRUCKS INCLUDING HUMMER H2). *TT
30892004-10-04. Service bulletin. ELECTRICAL SYSTEM. SERVICE ENGINE SOON LIGHT AND REDUCED ENGINE POWER WITH A DIAGNOSTIC TROUBLE CODE P1516. DIAGNOSTIC TROUBLE CODES P0120, P0220, P1514, P1515, P1518 AND P2135 MAY ALSO BE PRESENT. *TT
30872004-10-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. CRANK NO START WITH NO CRANKING RPM SPARK OR INJECTOR PULSE. *TT
30862004-10-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. WHISTLE NOISE FROM THE THROTTLE BODY AREA ON LIGHT THROTTLE ACCELERATION ON VEHICLES WITH GEN III ENGINES AND ELECTRONIC THROTTLE. *TT
101420022004-10-01. Service bulletin. VISIBILITY:REARVIEW MIRRORS/DEVICES. EXTERIOR MIRROR CURB VIEW ASSIST PROGRAMMING FUNCTIONS AND FEATURES. *TT
3046A2004-09-27. Service bulletin. FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM. FUEL GAUGE FLUCTUATION IN PARK OR NEUTRAL. *TT
30602004-09-27. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. THE ENGINE DOES NOT STALL WHEN PERFORMING A P1870 DIAGNOSTIC TEST WITH THE TECH 2 SCAN TOOL OR WHEN COMMANDING THE TORQUE CONVERTER CLUTCH ENABLE SOLENOID ON APPLICATIONS THAT DO NOT HAVE THE P1870 DIAGNOSTIC TEST LISTED. 4L60E OR 4L65E TRANSMISSIONS. *TT
042020042004-09-17. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER. WHEN SWITCHING THE WINDSHIELD WIPER SPEED FROM LOW TO INTERMITTENT, THE SPEED REMAINS IN THE LOW. GM VOICEMAIL EXPRESS. *TT
012320042004-09-10. Service bulletin. STRUCTURE:BODY. RATTLE IN THE REAR STOWAGE COMPARTMENT OF THE VEHICLE. GM VOICEMAIL EXPRESS. *TT
3000A2004-08-25. Service bulletin. SUSPENSION:REAR. REAR AXLE LOCKING DIFFERENTIAL CHATTER SHUDDER NOISE ON TURNS. *MJ
30002004-08-25. Service bulletin. STRUCTURE:BODY:DOOR. SERVICE VME - 03 - 04 FULL SIZE TRUCK, UTILITIES AND HUMMER H2 PASSENGER DOOR MODULE INOPERATIVE. *MJ
021492004-08-24. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. CLOCK NOT KEEPING PROPER TIME ON VEHICLES WITH NAVIGATION RADIO. *TT
30252004-08-24. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. 04 MODEL YEAR 4.8.5.3.7.6.0 GEN III ENGINE PISTON PIN INFORMATION. *MJ
30182004-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE CYLINDER HEAD CUP PLUG COOLANT LEAK. *MJ
30242004-08-23. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. RADIO PRESET READS SOMETHINGF OTHER THAN THE STATION ID OR STATION CALL LETTERS. *MJ
15300762004-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. VEHICLES AND HUMMER H2 WITH A HIGH ALTITUDE STALL. *MJ
30152004-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. 6.0L LQ4 VIN U ENGINE RESTRICTION. *TT
0408500072004-08-17. Service bulletin. SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER. SERVICE INFORMATION FOR FRONT HEATED SEAT INOPERATIVE/COLD. *MJ
0408500062004-08-16. Service bulletin. STRUCTURE:BODY. MINOR WRINKLES/CREASES, DISCOLORATION, CIGARETTE BURNS AND CUSTOMER INDUCED CUTS AND STRAINS ON FRONT AND REAR DRIVER AND PASSENGER SEATS WITH LEATHER, VINYL OR CLOTH SEAT COVERS. 2004 AND PRIOR CARS AND LIGHT DUTY TRUCKS. *MJ

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