2004 Hummer H2 Transmission and drivetrain Problems
- Complaints
- 2about this part
- Share
- 3%of 59 total for the year
- Median mileage
- 92,950miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the transmission and drivetrain of the 2004 Hummer H2, 3% of the 59 complaints for this model year. Where a mileage was given, the median is 92,950 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving home at night and about a mile before I got home my transmission didn't seem to shift as smooth as it usually does and when I parked in my garage I got out and transmission fluid was dripping out from under my H2 very quickly and by the next hour it had every bit run out and huge puddle of transmission fluid was all over my garage floor. I took the skid plate off my H2 and the transmission line had a hole rusted through it. Had I been another few miles away from getting home this could have destroyed my transmission and possibly caused me to wreck.”
NHTSA complaint #10918078, filed 2016-10, 93,900 miles“Gm 4l65-e or 4l65e transmission problem. Engine light has been on and frequently the 4 speed automatic transmission loses first and fourth gears. Will not automatically downshift from third to second (this can be done manually - only 2nd and 3rd work though) - feels like it will not come out of drive automatically when slowing all the way to a stop. …”
NHTSA complaint #10247095, filed 2008-10, 92,000 milesRelated service bulletins
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10222770Sep 16, 2022This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
- 10224273Sep 1, 2022This 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…
- 10143757Jul 9, 2018This Preliminary information communicates to the dealer technician thatLight Duty Trucks equipped with automatic transmissions and 4 wheel drive may exhibit a condition of…
- 10113325Jan 12, 2017This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have a Service Engine Soon Malfunction…
Transmission and drivetrain: other model years
Other parts of the 2004 Hummer H2
14 complaintsElectrical system
14 complaintsVisibility (wipers, defrost, mirrors)
13 complaintsSteering
6 complaintsAir bags
3 complaintsBody and structure
3 complaintsSuspension
3 complaintsElectronic stability control
2 complaintsEngine
2 complaintsOther or unknown
2 complaintsEngine cooling
1 complaintsEquipment
1 complaints
← All problems reported for the 2004 Hummer H2
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology