2006 Hummer H3 Engine Problems
- Complaints
- 52about this part
- Share
- 14%of 361 total for the year
- Median mileage
- 86,884miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 52 complaints about the engine of the 2006 Hummer H3, 14% of the 361 complaints for this model year. Where a mileage was given, the median is 86,884 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Truck will not start for no apparent reason. Key turns, sounds like it will start but does not. This has happened on several occasions and seems to be an ongoing problem for other Hummer owners too. I just had it towed once again to the mechanics shop. This is the 5th time within one year. Unable to leave my house during an emergency, child related.”
NHTSA complaint #10995755, filed 2017-06, 115,000 miles“P0300 code. Engine misfire. The Hummer forums I've researched say it's a common problem in these cars, manufactured before march 31, 2006. It seems the engine heads do not have properly hardened valve seats. Again, I'm finding this is a common problem and GM is fully aware of it.”
NHTSA complaint #11182390, filed 2019-02, 130,000 miles“When I start vehicle smoke blows out the exhaust for 30-90 seconds then it is gone. Sitting still and only does it when it starts up. Googled this and others have had this issue. Head gasket leaking into valves. This is a headache for tons of Hummer owners, so why haven't they issued a recall? Started last year, possibly in 2015 and I've just kept an eye on the oil and keep refilling as needed.”
NHTSA complaint #10978699, filed 2017-04, 115,000 miles“There are many forums about cylinder misfires - especially after the warranty runs out. I looked it up and was shocked to see how many other people have had the same issue and nothing has been done about it. Every Hummer owner I know has paid thousands of dollars to get their problems fixed. Why is there not a recall when so many have the same problem?? The idle is rough. The engine sputters. The light goes on and off constantly.”
NHTSA complaint #10947409, filed 2017-01, 95,000 miles“Car has been spontaneously stalling while driving at high speeds. Engine cuts out, power brakes and steering fail, no radio, etc. Vehicle loses all power. It is terrifying. Has happened at least 3 dozen times now. Several visits to dealer could not pinpoint problem. Dealers unable to duplicate stalling, although it has happened to me regularly for months - ie, every time I drive the car (with my two babies) for an extended period on the highway.”
NHTSA complaint #10568195, filed 2014-03, 89,000 milesRelated service bulletins
- 11007091Aug 5, 2024This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
- 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).
- 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…
- 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…
- 10173416Feb 28, 2020This informational bulletin explains Unscheduled Supplemental Services (including Flushing Services and Additives) and the Proper use of GM Simplified Maintenance Schedules.
- 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…
- 10160987May 7, 2019This 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…
Engine: other model years
Other parts of the 2006 Hummer H3
96 complaintsVisibility (wipers, defrost, mirrors)
59 complaintsBody and structure
36 complaintsEngine cooling
35 complaintsOther or unknown
29 complaintsSuspension
29 complaintsAir bags
20 complaintsBrakes
20 complaintsTransmission and drivetrain
20 complaintsLatches, locks and linkages
11 complaintsSteering
11 complaintsFuel system
10 complaints
← All problems reported for the 2006 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