TL* THE CONTACT OWNS A 2008 HUMMER H3. WHILE DRIVING APPROXIMATELY 50 MPH WITH THE AIR CONDITIONING UNIT ACTIVATED, THERE WAS A BURNING ODOR INSIDE THE VEHICLE WITHOUT WARNING. THE AIR CONDITIONER FAILED. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE LOWER RESISTOR AND WIRING HARNESS FAILED, MELTED TOGETHER, AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE CONTACT REC…
2008 Hummer H3 electrical problems
severe 32 complaints filed with NHTSA · avg repair $850
Complaints
32
Recalls
0
Crashes
1
Avg fix
$850
What owners are reporting 3 most recent
I LOOKED ON THE INTERNET TO FIND OUT WHY MY HEATER BLOWER WAS NOT WORKING AND THERE WERE LOTS OF COMPLAINTS ABOUT THE WIRING HARNESS AND RESISTOR BURNING OUT. I CHECKED MINE AND SURE ENOUGH MINE WAS BURNT ON THE WIRING HARNESS ALL THE WAY THROUGH THE PLASTIC. GM NEEDS TO FIGURE OUT WHY IT WOULD CAUSE IT TO MALFUNCTION LIKE THAT CAUSE IT COULD CAUSE A FIRE. *TR
I WAS CUT OFF BY ANOTHER DRIVER IN RUSH HOUR TRAFFIC AND THE HORN FAILED TO OPERATE WHEN PRESSED. AFTER THIS INCIDENT, I DISCOVERED THAT THE HORN DOES NOT WORK AFTER THE VEHICLE IS DRIVEN EVERY FEW MILES! THE VEHICLE WAS IN THE SHOP FOR HOURS OF DIAGNOSIS, AND FINALLY IT WAS DISCOVERED BY THE TECHNICIAN THAT THE VEHICLE HAS A BAD "SIR COIL". THE "SIR COIL" IS ON SPECIAL ORDER. *TR
Common questions
How serious is the electrical problem on the 2008 Hummer H3?
It's a meaningful issue. 32 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical 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 $850 for electrical 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 electrical?
No active recalls currently cover electrical 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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