2004 Hummer H2 Engine Problems
- Complaints
- 2about this part
- Share
- 3%of 59 total for the year
- Median mileage
- 165,975miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the engine of the 2004 Hummer H2, 3% of the 59 complaints for this model year. Where a mileage was given, the median is 165,975 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 am having a problem with my Hummer 2004. The lock light comes on and my Hummer will not start. This is so horrible the problem started about 3 months ago. Everytime that light comes on I have to waite 15to 25 minutes for it to start again.”
NHTSA complaint #11139109, filed 2018-10, 165,975 miles“Yesterday I turned off the alarm and unlocked the doors via the keypad. I opened the driver door and my wife opened the passenger rear door and the Hummer H2 started. No key in the ignition and the fob does not have a start button. I then got in the car and inserted the key and turned the key to ON then to off and the vehicle would not shut off. Only after cycling through the gears was I able to shut off the vehicle. I have now disconnected the battery to prevent another unwanted start.”
NHTSA complaint #11453331, filed 2022-02Related service bulletins
- 11012907Dec 18, 2024This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
- 11010544Oct 7, 2024This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
- 10242298Aug 10, 2023This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308…
- 10211658May 2, 2022This service bulletin provides policy information on warranty administration guidelines for multiple repairs with independent causes (GM Canada Dealers Only).
- 10178387Jul 27, 2020This Preliminary Information communication provides information to the technician about finding needle bearings during an oil change. Technician will gain access to the roller…
- 10176645May 28, 2020This information bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
- 10176326May 21, 2020This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308…
- 10176607May 8, 2020This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank…
- 10173398Feb 28, 2020This diagnostic tip provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
- 10167437Oct 14, 2019This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the…
Engine: 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 complaintsOther or unknown
2 complaintsTransmission and drivetrain
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 27, 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