Hummer H3 Engine Problems
Owners have filed 124 complaints with NHTSA about engine problems on the Hummer H3 across 5 model years. The 2006 model year has the most (52). The words owners use most often: “cylinder head” (7% of reports).
- 124engine complaints
- —median miles at failure
- 1mention a crash
- 0mention an injury
- 0related recalls
- $4,200typical repair cost reported by owners
- 51%of reports with a speed happened at 50+ mph
What owners describe
Phrases that appear unusually often in these complaints compared with complaints about other cars.
- Cylinder head: mentioned in 9 of 124 complaints (7%)
- Failed start: mentioned in 7 of 124 complaints (6%)
How much does it cost to fix?
Owners who wrote down what they paid or were quoted put the typical engine repair on the Hummer H3 at $4,200, and half of them between $1,350 and $7,000.
Based on 9 NHTSA complaints about this problem alone that state a repair bill or quote (2013–2021), converted to 2026 dollars with the U.S. consumer price index. These are owners' own figures, not a quote: they include dealer quotes, and owners who file complaints often faced larger repairs, so they can run higher than typical shop prices. Prices vary by shop, region and warranty coverage. How we calculate this.
At what mileage do engine problems happen?
Based on 104 complaints that reported the odometer reading.
How serious are the reports?
Of 124 complaints, 1 mention a crash, 3 a fire.
Hummer H3 engine complaints by model year
When owners reported it
Related recalls (0)
No safety recall lists engine for the Hummer H3. A pattern of complaints does not always lead to a recall.
What owners report
Short excerpts of recent complaints, with personal details removed. Full reports are on NHTSA.gov.
The blower resistor and harness needs replaced it looks like it caught fire or default
The contact owns a 2009 Hummer H3. The contact stated that while attempting to start the vehicle, the vehicle failed to start. The contact waited for a while before the vehicle started. The contact stated that the vehicle was slow to start. The contact stated that while her husband was at the…
On the electrical, I refer to my air conditioning and heater. When I have my air selection to coldest and I drop 1 click for it to be less cool, my heater turns on and at times it smells like something burning. I have to turn it off . On the engine, after I hit 90,000 miles, I have to fill up my…
Was heading home from work and the 2006 Hummer H3 shut off while traveling in the middle of traffic was able to cruise in Nuetral until I could stop to start car again started car and yet again I receive a cylinder misfire code which has been repaired on multiple attempts still no success. I am…
The last dealership I went to they advised to come th the dealership but when I got there nobody wasnât trying to work there instead the said that it was going to be hard to work on it cause nobody work on those cars anymore and then they said they were going to order the part but never call me…
Frequently asked questions
Do all Hummer H3s have engine problems?
No. NHTSA has 124 owner complaints about engine for the Hummer H3. Complaint data shows that the problem is reported, not how many of all cars sold are affected.
Was there a recall on the Hummer H3 engine?
No recall currently lists engine for this vehicle.
How much does it cost to fix engine problems on the Hummer H3?
Owners report a typical cost of $4,200 (half paid between $1,350 and $7,000), from 9 complaints that state a repair bill or quote, in 2026 dollars.
What do owners say about engine problems on the Hummer H3?
The most frequent phrase is “cylinder head”, in 9 of 124 complaints, followed by “failed start” (7).
Other Hummer H3 problems
See all Hummer H3 problems.