2008 Hummer H3 Engine Problems
- Complaints
- 18about this part
- Share
- 16%of 113 total for the year
- Median mileage
- 71,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 18 complaints about the engine of the 2008 Hummer H3, 16% of the 113 complaints for this model year. Where a mileage was given, the median is 71,000 miles.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“While driving I noticed heavy smell of antifreeze.. I took to local shop and we noticed antifreeze all over engine. Radiator had crack on top. After research I see multiple complaints online with other Hummer owners same issue. Had to replace radiator. Mechanic said ther radiator rubs and bounces against the frame causing crack.”
NHTSA complaint #10726316, filed 2015-06, 68,000 miles“The antilock safety is preventing me from starting my vehicle. When it does start, and I go to an intersection to turn the truck will then stall out. It can cause a wreck. It is a huge safety issue, time consuming, and money consuming when I have to wait 10 minutes to try to start my truck, or it doesn't start, I have to replace it for $450+ which I don't have to replace the ignition switch and it's dangerous because if it does let it start I have to be careful because it will stall out on any given second causing a catastrophe!!! …”
NHTSA complaint #11415729, filed 2021-05, 100,000 miles“The security lock system on my Hummer H3 intermittently flashes during start causing the vehicle to not crank. Normally I have to wait 10 to 20 minutes for the system to reset itself and she starts right up, but today it's been 8 hours. Finally I had to call for a tow to the GM dealership. We got lucky today. At 10am my wife thought she was going into labor, we get to the truck and no start. Just a flashing security lock symbol flashing at me. Ended up using her car. This is definitely a safety concern, what if her water had broke or my son was needing medical attention. …”
NHTSA complaint #10872435, filed 2016-06, 107,000 miles“I bought a 2008 Hummer H3 four months ago at 49,956 miles, when last week I noticed I had a bad coolant leak causing the fluids to remain on the top of the engine, the fan shroud, etc. Had it towed back to the dealership where I bought it from because its a 48 miles drive and didn't want to take the chance of anything overheating. Took it in on friday morning got it back monday afternoon when I was told the radiator was cracked. After looking on the internet seems like everyone seems to be having this problem. The mileage when the dealership received it on friday was 52,547.”
NHTSA complaint #10503728, filed 2013-03, 52,547 miles“The engine completely shut off while driving on a major highway. The steering wheel locked up and the car came to a stop. Luckily, each time this occurred, I was able to pull over to the shoulder. There were no error lights that came up on both occasions of this happening. The battery continue to die, even after being replaced three times in 6 months!”
NHTSA complaint #11098497, filed 2018-05, 80,000 milesRelated service bulletins
- 11009531Sep 27, 2024This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
- 11007116Aug 6, 2024This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- 11007091Aug 5, 2024This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
- 11000119Apr 26, 2024This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 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).
- 10199238May 3, 2021This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy.
- 10178949Jul 28, 2020This Bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC…
- 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…
- 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…
Engine: other model years
Other parts of the 2008 Hummer H3
34 complaintsVisibility (wipers, defrost, mirrors)
27 complaintsAir bags
17 complaintsOther or unknown
9 complaintsBody and structure
8 complaintsSteering
5 complaintsBrakes
4 complaintsEngine cooling
4 complaintsEquipment
4 complaintsFuel system
4 complaintsSuspension
4 complaintsExterior lighting
3 complaints
← All problems reported for the 2008 Hummer H3
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