2006 Hummer H3 Engine And Engine Cooling Problems
NHTSA component category: ENGINE AND ENGINE COOLING · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How engine and engine cooling ranks on this vehicle
Share of the 360 complaints citing each category; one complaint can cite several. Full breakdown on the 2006 Hummer H3 overview page.
What owners report
“THE CONTACT OWNS A 2006 HUMMER H3. WHILE DRIVING APPROXIMATELY 40 MPH, THE VEHICLE BECAME HESITANT WHILE ACCELERATING UPHILL. THE VEHICLE WAS TAKEN TO THE…”NHTSA complaint 10422551 — filed 08/30/2011
“THE CONTACT OWNS A 2006 HUMMER H3. THE CONTACT STATED THAT THE CHECK ENGINE LIGHT REMAINED ILLUMINATED AND THE ENGINE WOULD EXHIBIT A LOUD NOISE…”NHTSA complaint 10409388 — filed 06/29/2011
“LOSS OF POWER, WAS ABLE TO DRIVE TO THE LOCAL GM DEALER.MECHANIC STATED IT WAS DUE TO A VALVE SEAT COMING LOOSE IN THE HEAD.MECHANIC…”NHTSA complaint 10401980 — filed 05/17/2011
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Engine And Engine Cooling complaints by year filed
Frequently asked questions
Does the 2006 Hummer H3 have engine and engine cooling problems?
Engine And Engine Cooling is the #5 most-reported problem area on the 2006 Hummer H3: 26 of 360 complaints on file (7.2%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2006 Hummer H3 have in total?
360 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 10 involved a crash, 27 involved a fire, 8 reported injuries, and 1 reported deaths.
What does NHTSA's engine and engine cooling category include?
NHTSA assigns each complaint to standard component categories; this page reports the ENGINE AND ENGINE COOLING category exactly as NHTSA defines and records it.
