I've had plenty of Hummer in the bay over the years, and the engine complaints on these don't surprise me. 126 on the NHTSA record across 6 model-year entries (2005–2009) is not a fluke. The 2006 Hummer H3 is carrying most of the weight on this category — about 56% of every engine complaint filed against Hummer comes from that one truck. The pattern shows up across the lineup, but that year-model is where it concentrates. Most reports are nuisance-grade rather than safety-critical — but the volume itself is the signal. Repair exposure averages $3,100, which is meaningful money outside warranty. Across the 99 complaints reporting odometer mileage, the median failure lands at about 70,822 miles. Budget for a real pre-purchase inspection — compression and leakdown test, not just a code scan. Both are cheap and tell you what is left in the engine.
ProblemsByVin HUMMER / ENGINE
6 model-year entries · 2005–2009
Hummer engine problems
126 owner complaints filed with NHTSA against Hummer vehicles for engine issues. See engine across all makes →
Complaints
126
Recalls
0
Year-models
6
Avg fix
$3,100
2fires
Worst-affected Hummer model-years for engine Top 6 by complaint volume
1 2 3 4 5 6
2006 Hummer H3
70 complaints · ~$3,100 moderate
2007 Hummer H3
31 complaints · ~$3,100 moderate
2008 Hummer H3
13 complaints · ~$3,100 moderate
2006 Hummer H2
5 complaints · ~$3,100 moderate
2009 Hummer H3
4 complaints · ~$3,100 moderate
2005 Hummer H2
3 complaints · ~$3,100 moderate
Common questions
How many Hummer engine complaints are on file with NHTSA?
126 complaints across 6 model-year entries from 2005 to 2009. No active recall campaigns currently cover this category for Hummer.
Which Hummer model has the most engine complaints?
The 2006 Hummer H3 leads with 70 complaints in this category. Next: 2007 H3 (31) and 2008 H3 (13).
What does it cost to fix Hummer engine problems?
Independent shops average $3,100 for engine repairs across the Hummer lineup. Dealer pricing tends to run twenty to forty percent higher. Specific cost depends on the failure mode and parts availability.
Are there Hummer engine recalls?
No active NHTSA recalls currently cover engine issues on Hummer vehicles. The complaints are owner-reported and have not risen to a manufacturer recall.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA) public records database.
Editorial commentary written by Mark Driver, an independent contributor to ProblemsByVin
and not affiliated with Hummer.
Severity ratings derive from reported crashes, fires, injuries, and fatalities on the NHTSA complaint and recall record.
Repair cost averages reflect independent-shop pricing and may differ in your area.