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Service bulletins for the 2003 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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
PI1394B2024-02-02. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This PI bulletin advises the technician on the proper way to install the pistons in an engine.
PIP5640A2022-10-17. Service bulletin. POWER TRAIN. This Preliminary Information communication provides information to the technician to not remove the torque converter bolts and start the engine as this may cause damage to the torque converter of the crankshaft on vehicles equipped with an automatic transmission.
06-00-89-031H2022-10-11. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
06-00-89-031D2021-09-07. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN; ENGINE. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
06-00-89-031D2021-04-20. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE. OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
PIP3366C2018-08-20. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of grinding/ratcheting type noise when shifting the automatic transmission into park while the transfer case is in 4 wheel drive low (4LO) range. Dealers technician's are advised this condition should be deemed a normal characteristic of 4WD low operation.
02-07-30-052I2018-06-04. Service bulletin. POWER TRAIN; EQUIPMENT. This informational bulletin provides information for Automatic Transmission Oil Cooler Flow Test Essential Tool J-45096 TransFlow.
02-07-30-052J2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES. This informational bulletin provides technicians with information regarding automatic transmission oil cooler flow test essential tool J-45096 TransFlow®.
PIP3119N2017-08-15. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; POWER TRAIN. This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have a Service Engine Soon Malfunction Indicator Lamp on at low mileage. Technician may find Diagnostic Trouble Codes P0420 and or P0430 stored. Technician should be advised that the catalytic converter efficiency Diagnostic Trouble Codes P0420 and P0430 are disabled for the first hour of engine run time to allow break-in of the catalytic converter. Technician will need to use a Tech2 to check the verify engine run time on the Engine Hour Meter in the Instrument Panel Cluster Data Display/Data 1 List in the scan tool match. If the engine run time is less than one hour, the battery may have been disconnected, or another vehicle power loss event may have occurred, during vehicle manufacturing. Technician will need to clear the Diagnostic Trouble Codes and perform a drive cycle. If the catalytic converter was replaced and the Diagnostic Trouble Codes set it may be a result of the engine run time restrictions no longer being in place since the vehicle is no longer new. Technician will need to clear the Diagnostic Trouble Codes and perform a drive cycle.
PIP4138L2017-08-15. Service bulletin. EQUIPMENT:MECHANICAL; POWER TRAIN. This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on, engine misfire, and/or engine noise. Technician may find Diagnostic Trouble Codes P0300-P0308. If published Service Information diagnostics does not isolate the cause of this concern technician should check for a worn camshaft lobe and/or lifter roller, a sticking valve, valve leakage, a broken valve spring, and a collapsed active fuel management lifter.
PIP3720D2017-08-15. Service bulletin. POWER TRAIN:AXLE ASSEMBLY. This Preliminary Information communication provides information to the technician with the axel setup information from American Axle Manufacturing. Technician should be advised that the maximum pinion shim to be used or stacked behind the pinion is 0.050?, and the minimum pinion shim is 0.020? for an 8.6 axle. The range for available pinion depth shims for the 10.5? axle is 0.006? to 0.024?. When setting the backlash it should be set between 0.003? to 0.005? on a new ring and pinion for any American Axle Manufacturing application. The ring and pinion can be reused or adjusted if the mileage is less than 500 miles, if not used for towing. Technician should be advised that a ?roller coaster? or ?hourglass? pattern on the bearings may be normal up to 10,000 miles and possibly longer. With a mis-machined housing you may get a heel pattern on both sides of the gear teeth at build up can generally be corrected with backlash adjustments. When setting up an 8.6? axle with a 5 cut gear set is to use a 0.035? pinion shim and set backlash to 0.004?. When using the newer 2 cut gear set also use a 0.035? pinion shim and still set backlash to 0.004?. To set the gear pattern use backlash to adjust the pattern heel to toe. Use the pinion shim to adjust the height of the pattern. The proper drive pinion bearing pre-load is from 15 - 30 inch pounds with new bearings. The total torque to turn after the differential case is installed should increase 5 - 10 inch pounds at the pinion. A new pinion nut must be used whenever the old one is removed. The axle shaft end play specification is 0.012? per side and the radial specification is 0.002? - 0.003?. Technician should be advised that synthetic lube can be used in all new American Axle Manufacturing axle assemblies. The new pinion seal for the 8.6? axle assembly is a two piece design.
0307300072007-03-05. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. DELAYED ENGAGEMENT WHEN SHIFTING INTO THESE POSITIONS. PARK INTO REVERSE, NUETRAL INTO DRIVE, NUETRAL INTO REVERSE, AND PARK INTO DRIVE. THIS BULLETIN INCLUDES ALL 2000 - 2007 GM LIGHT DUTY TRUCKS. *KB
31362007-02-22. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION. SLIP CONDITION IN 2ND, 3RD, OR 4TH. DAMAGED 2-4 OR 3-4 CLUTCH. *KB UPDATED 10/31/07. *NJ
0500900042005-11-07. Service bulletin. POWER TRAIN:AXLE ASSEMBLY. REVISED FRONT AND REAR DRIVE AXLE FLUID CAPACITIES AND WHEEL NUT TORQUE SPECIFICATION. *TT
34242005-11-02. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). ELECTRONIC TRANSFER CASE UNABLE TO COMPLETE SHIFT. *TT
007732005-10-27. Service bulletin. POWER TRAIN. 4L60E, 4L65E REPLACEMENT VALVE BODY GASKETS DOES NOT SEEM TO FIT. *TT
0407300062005-03-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. 4L65 4L60E 4L60 AND 2004R AUTOMATIC TRANSMISSION OIL PUMP SPRING FIRST AND SECOND DESIGN IDENTIFICATION. *EH
0107300312005-03-10. Service bulletin. POWER TRAIN. 1-2, 2-3, 3-4, 4-5 SHIFT AND TORQUE CONVERTER CLUTCH (TCC) CHARACTERISTICS DURING COLD WEATHER OPERATION ON 4L60-E, 4L80-E OR ALLISON TRANSMISSIONS. TO INCLUDE 2001-2004 CHEVROLET AND GMC LIGHT DUTY FULL-SIZE PICKUP AND UTILITY MODELS. *TT
0304190032005-03-07. Service bulletin. POWER TRAIN:DRIVELINE. FLUID LEAK FROM FRONT OF VEHICLE ADD TEFLON TAPE TO FRONT AXLE VENT PLUG THREADS. *EH
0407300372004-12-28. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. RELEASE OF DEXRON III (H-REVISION) AUTOMATIC TRANSMISSION FLUID (ATF). 2005 AND PRIOR CARS AND LIGHT DUTY TRUCKS. *TT
3045A2004-11-05. Service bulletin. POWER TRAIN. 4485 4484 SHUDDER OR BIND ON TURNS IN 4 HI. *SC
31362004-11-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. THE 4L60E/4L65E AUTOMATIC TRANSMISSION SLIP CONDITION IN 2ND, 3RD, OR 4TH GEAR. ALSO TO INCLUDE THE PONTIAC GTO 2005. *TC
30542004-10-14. Service bulletin. POWER TRAIN. REPLACEMENT FLEXPLATE MAY HAVE LARGER BOLT HOLES THAN THE ORIGINAL FLEXPLATE. *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
0407300132004-08-16. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. AUTOMATIC TRANSMISSION SHIFT, ENGINE DRIVEABILITY CONCERNS OR SERVICE ENGINE SOON (SRS) LIGHT ON AS A RESULT OF THE INSTALLATION OF AN AFTERMARKET REUSABLE, EXCESSIVELY OILED AIR FILTER. 2004 AND PRIOR CARS AND LIGHT DUTY TRUCKS. *MJ 2005 AND PRIOR. *TT

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