2006 Hummer H3 engine and engine cooling problems
35 owner complaints filed with NHTSA name the engine and engine cooling on the 2006 Hummer H3 — 10% of all complaints for this model year.
What owners report
“The contact owns a 2006 Hummer H3. The contact stated that the frame was rusted on the driver's side. The check engine warning light was illuminated. The contact looked underneath the vehicle and was able to see through the subframe. The contact also noticed cracks in sub frame. The contact was…”
filed Jan 14, 2026
“2006 hummer h3. Consumer writes in regards to repairs to vehicle radiator overheating problems and seeks reimbursement for recall notice 15042. *smd the consumer stated the radiator, thermostat and water pump, were replaced on more than one occasion. *jb”
filed Apr 26, 2016
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine and Engine Cooling problems in other H3 years
| Year | Reports | Share |
|---|---|---|
| 2009 H3 | 1 | 1% |
| 2008 H3 | 4 | 4% |
| 2007 H3 | 13 | 5% |
Other reported problem areas on the 2006 Hummer H3
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.