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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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Bulletins, newest first
020846010E2003-10-03. Service bulletin. UNKNOWN OR OTHER. PROGRAMMING ONSTAR MODULE FOR CANADIAN FRENCH VOICE RECOGNITION. *TT UPDATE. *TT UPDATED *EH
0307300272003-09-30. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. MOST FREQUENTLY ASKED QUESTIONS AND ANSWERS FOR J 45096 TRANSFLOW TRANSMISSION OIL COOLING SYSTEM FLUSHING MACHINE. 2004 AND PRIOR PASSENGER CARS AND LIGHT DUTY TRUCKS WITH AUTOMATIC TRANSMISSION/TRANSAXLE AND 2004 AND PRIOR HUMMER H2. *TT
990089021D2003-09-30. Service bulletin. UNKNOWN OR OTHER. EXPEDITING WARRANTY PARTS. 2004 AND PRIOR PASSENGER CARS, TRUCKS AND HUMMER H2. *TT
990730022A2003-09-30. Service bulletin. POWER TRAIN. SHIFT STABILIZATION AND TOW/HAUL MODE FEATURE FOR HYDRA-MATIC 4L60-E/4L65-E AND 4L80-E/4L85-E TRANSMISSIONS. *TT
030730002A2003-09-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. TRANSMISSION COOLING SYSTEM SERVICE TOOL J 45096 - TRANSFLOW INFORMATION. *TT
0306040332003-09-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. REVISED DIAGNOSTIC TROUBLE CODE P0336. *TT UPDATE. TO INCLUDE 2004 ISUZU NQR COMMERCIAL MODELS. *TT
0301390082003-09-27. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. CHANGES IN AIR CONDITIONING COMPESSOR ON/OFF INSTRUMENT PANEL DISPLAY SYMBOL FROM 2003 TO 2004 MODEL YEAR AND SYNCHRONIZING THE DRIVER AND PASSENGER SET TEMPERATURES. *TT
0306040302003-08-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. MULTIPLE DRIVEABILITY SYMPTOMS OF LONG OR HARD STARTS, CHUGGLE, ROUGH IDLE AND LIGHT OR INTERMITTENT MISFIRE DUE TO CLOGGED FUEL INJECTORS. *TT
0306040122003-04-05. Service bulletin. ELECTRICAL SYSTEM. INSPECTION OF ALL RELATED WIRING HARNESS CONNECTIONS WHEN DIAGNOSING MISCELLANEOUS DIAGNOSTIC TROUBLE CODES, INTERMITTENT DRIVEABILITY CONCERNS, HARD START, NO START, INCORRECT GAUGES, INOPERATIVE AIR CONDITIONING SYSTEMS, SERVICE ENGINE SOON LAMPS ILLUMINATED, 4WD LAMP ILLUMINATED, INSTRUMENT PANEL GAUGES INOPERATIVE, CRUISE INOPERATIVE. 2006 AND PRIOR CARS AND LIGHT DUTY TRUCKS. *TT
010730036D2003-03-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. DIAGNOSTIC TIPS FOR DIAGNOSTIC TROUBLE CODE P0756. 2006 AND PRIOR PASSENGER VEHICLES AND LIGHT DUTY TRUCKS. *TT
010730042A2003-03-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. INFORMATION ON 2-3 UPSHIFT OR 3-2 DONWSHIFT CLUNK NOISE FOR 2003 AND PRIOR LIGHT DUTY TRUCKS. *TT THIS BULLETIN REPLACES 01-07-30-042A DATED 10/01/2002. 2004 AND PRIOR LIGHT DUTY TRUCKS. *TT
020730024A2002-10-11. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT. DIAGNOSIS OF CRACKED OR BROKEN TRANSMISSION CASE. *TT 2006 AND PRIOR CARS AND LIGHT DUTY TRUCKS. *TT
0208460062002-10-03. Service bulletin. UNKNOWN OR OTHER. INCORRECT ONSTAR GLOBAL POSITION SYSTEM (GPS) LOCATION REPORTED DURING ONSTAR CALL FOR 2000 - 2002 PASSENGER CARS AND LIGHT DUTY TRUCKS WITH ONSTAR. *TT UPDATE TO ADD 2005 MODELS. *TT
0206030082002-09-28. Service bulletin. ELECTRICAL SYSTEM. LOW VOLTAGE DISPLAY ON IP GAUGE, LIGHTS DIM AT STOP LIGHTS, BATTERY DISCHARGED, NO START, SLOW CRANKING, DIM LIGHTS AT IDLE, LOW GENERATOR OUTPUT. NLM *AR INCLUDES 1990-2008 PASSENGER CARS AND LIGHT DUTY TRUCKS INCLUDING SATURN. UPDATED 07-24-07. *KB UPDATED 11/29/07. *NJ
0206030092002-09-28. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. BATTERY CHARGING TIPS - 1990-2003 PASSENGER CARS AND LIGHT DUTY TRUCKS, 1990-2003 ISUZU LIGHT DUTY TRUCKS, 2003 HUMMER H2. NLM 1990 - 2007 GM PASSENGER CARS AND LIGHT DUTY TRUCKS (INCLUDING SATURN); 1990 - 2007 ISUZU LIGHT DUTY TRUCKS. *TT
9908510072002-07-15. Service bulletin. WHEELS. THIS BULLETIN UPDATES GMCS POSITION ON REFINISHING ALUMINUM WHEELS FOR 2003 AND PRIOR PASSENGER CAR AND TRUCKS. *TT 2007 AND PRIOR PASSENGER CARS AND TRUCKS INCLUDING SATURN. UPDATED. *KB
0206040152002-05-21. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. INTERMITTENT NO CRANK, NO START CONDITION FOR 2001-2002 PASSENGER CARS AND TRUCKS. *SLC 2001-2007 GM PASSENGER CARS AND LIGHT-DUTY TRUCKS (INCLUDING SATURN). *TT
SB-020842001B2002-05-21. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS. GENERAL MOTORS VEHICLES AND TRUCKS: SUBJECT REGARDING, 2002 AND PRIOR PASSENGER CARS AND TRUCKS, CHEMICAL DAMAGE TO EXTERIOR POLYCARBONATE HEADLAMP LENSES. *SLC UPDATED *EH UPDATED 3/30/11. HEADLAMP LENS OVERHEATING WHEN COVERED AND CHEMICAL DAMAGE TO EXTERIOR POLYCARBONATE HEADLAMP LENSES. CAN CAUSE CRAZING OR CRACKING OF HEADLAMP LENS. *PE UPDATED 6/24/11. *PE UPDATED 5/14/12. INCLUDING 2013 MODEL YEAR. *PE
020730001A2002-03-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. DIAGNOSTIC INFORMATION ON DIAGNOSTIC TROUBLE CODE P1870, TRANSMISSION COMPONENT SLIPPING FOR 2000 - 2002 PASSENGER CARS AND LIGHT DUTY TRUCKS. *TT UPDATE TO INCLUDE 2004 MODELS. *TT UPDATED *EH
0107300422002-03-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. SOME VEHICLES MAY EXHIBIT A CLUNK NOISE THAT CAN BE HEARD ON A 2-3 UPSHIFT ON 2002 AND PRIOR LIGHT DUTY TRUCKS. *TT UPDATE. 2007 AND PRIOR PASSENGER CARS AND LIGHT DUTY TRUCKS. *KB
010730030A2002-02-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. DIAGNOSTIC INFORMATION ON HARSH 1-2 UPSHIFT. 2001-2002 PASSENGER VEHICLES AND LIGHT DUTY TRUCKS. *YH TO INCLUDE 2003-2006 PASSENGER VEHICLES AND LIGHT DUTY TRUCKS. *TT
0105260012001-06-04. Service bulletin. PARKING BRAKE. LOW EFFORT PARKING BRAKE APPLY SYSTEM. *TT
9909400052000-04-07. Service bulletin. SEAT BELTS:FRONT:ANCHORAGE. INFORMATION ON THE AVAILABILITY OF SEAT BELT EXTENDERS FOR 2000 AND PRIOR PASSENGER CARS AND TRUCKS. *TT UPDATED THIS BULLETIN CONTAINS 2007 AND PRIOR PASSENGER CARS AND TRUCKS INCLUDING SATURNS. *KB

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