TL* THE CONTACT OWNS A 2007 HUMMER H3. WHILE DRIVING APPROXIMATELY 40 MPH, THE VEHICLE SHOOK VIOLENTLY AND STALLED WITHOUT WARNING. THE VEHICLE COULD NOT BE RESTARTED. THE VEHICLE WAS TOWED TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE ENGINE OR THE CYLINDER NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 56,800. UP…
2007 Hummer H3 engine problems
moderate 31 complaints filed with NHTSA · avg repair $3,100
Complaints
31
Recalls
0
Crashes
0
Avg fix
$3,100
What owners are reporting 5 most recent
TL* THE CONTACT OWNS A 2007 HUMMER H3. WHILE DRIVING 35 MPH, THE ENGINE OIL INDICATOR ILLUMINATED AND AN ODOR EMITTED FROM THE VEHICLE. THE CONTACT REPLACED THE OIL AND TOOK THE VEHICLE TO AN INDEPENDENT MECHANIC WHERE IT WAS DISCOVERED THAT THERE WAS A SMALL HOLE IN THE MANIFOLD, WHICH BURNED OUT THE OIL. THE CONTACT PAID OUT OF POCKET TO HAVE THE VEHICLE REPAIRED. THE MANUFACTURER WAS NOTIFIED A…
NOTICED RADIATOR FLUID DRIPPING UNDERNEATH VEHICLE. OPENED THE HOOD AND FOUND RADIATOR COOLANT HAD BEEN BLOWN ALL OVER INTERIOR ENGINE COMPARTMENT. ENOUGH COOLANT REMAINED IN THE RESERVOIR TO PREVENT OVERHEATING. I NOTICED THE INCIDENT JUST IN TIME. *TR
DRIVING DOWN THE ROAD AND IT STOP AND IT WOULD NOT START ENGINE LOCK UP
IF RETURNING SOON AFTER SHUT OFF ; IT WILL NOT RESTART. HAVE TO WAIT AWHILE FOR IT TO RESTART. IT'S WEIRD BECAUSE THERE ARE NO OTHER PROBLEMS. IT HAS BEEN DOING THIS FOR AWHILE NOW.
Common questions
How serious is the engine problem on the 2007 Hummer H3?
It's a documented issue but not catastrophic. 31 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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