2003 Hummer H2 Engine Problems
- Complaints
- 4about this part
- Share
- 3%of 141 total for the year
- Median mileage
- 52,500miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine of the 2003 Hummer H2, 3% of the 141 complaints for this model year. Where a mileage was given, the median is 52,500 miles. 2 a fire, according to the filers.
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.
“Exhaust manifold bolts rusted off and the vehicle makes a ticking sound. I just observed a video explaining that this is a common problem. It also may cause other emissions related problems. Call me day or night for any further information. This vehicle has had nothing but problems and an unrelated engine fire due to the faulty windshield wiper motor in 2009.”
NHTSA complaint #10562646, filed 2014-02, 75,000 miles“The pass lock keeps my vehicle from starting and stopping it at random, and has been doing this for years. Seems to happen to at least 85% of hummers out there if you check around, Hummer forum and other places. This is very serious. Stops at intersections, and could on railroad tracks. I know that you've had complaints about this for years and ignored them, saying that you haven't had other complaints. This should be addressed by your agency, as your job is to keep the citizens safe. Not pass them off as you've been doing for years on this issue with the GM pass lock system. …”
NHTSA complaint #11398236, filed 2021-02, 32,000 miles“A parked Hummer H2 2003 was spontaneously combusted and destroyed. The SUV was driven that fateful day for about 15 minutes back and forth to a grocery store and parked in our driveway. Engine was off and key was out. About 10 minutes later, my daughter noticed the engine on fire and panicked. Called 911. Fire engine hosed the fire out in the next 1/2 hour but the SUV was charred and the front of the house damaged badly. We had kept the H2 well maintained and serviced it regularly. There were no mechanical or electrical issues otherwise. We are a non-smoking family. …”
NHTSA complaint #10547740, filed 2013-10, 60,000 miles“The contact owns a 2003 Hummer H2. The contact stated that the vehicle failed to start. It took the contact up to thirty minutes to start the vehicle and the lock warning indicator illuminated. The vehicle was taken to an independent mechanic and the ignition switch was repaired, but the failure recurred. The vehicle was not repaired. The manufacturer and dealer were not notified. The failure mileage was 45,000.”
NHTSA complaint #11181244, filed 2019-02, 45,000 milesRelated 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 2003 Hummer H2
52 complaintsElectrical system
24 complaintsBrakes
18 complaintsSteering
17 complaintsBody and structure
13 complaintsSuspension
11 complaintsTransmission and drivetrain
11 complaintsEngine cooling
5 complaintsSeats
5 complaintsWheels
5 complaintsVehicle speed control
3 complaintsFuel system
2 complaints
← All problems reported for the 2003 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