Problems · by component

2008 Hummer H3 electrical system problems

34 owner complaints to NHTSA about the 2008 Hummer H3 cite electrical system, 30% of all 113 complaints for this model year.

Complaints
34
30% of all complaints
Crashes
1
Reported by owners
Fires
4
Reported by owners
Injuries
0
Reported by owners
01 —Owner reports

What owners say about the electrical system

Verbatim from NHTSA complaints, newest first
“The pass lock in this vehicle is faulty. On numerous occasions, it has left me unable to start the vehicle, but if you wait 10 minutes each time, it will start again, but it happens all the time. I've seen numerous complaints online and GM needs to do something about it.”
Owner complaint to NHTSAFiled Jul 13, 2025Electrical systemODI 11673147
“The last dealership I went to they advised to come th the dealership but when I got there nobody wasn’t trying to work there instead the said that it was going to be hard to work on it cause nobody work on those cars anymore and then they said they were going to order the part but never call me back for it. Call them but gave me the runaround basically.”
Owner complaint to NHTSAFiled May 29, 2024Electrical system, Unknown or other, EngineODI 11591369
“The contact owns a 2008 Hummer H3. The contact stated that the vehicle intermittently failed to start up without warning. The contact stated that after waiting ten minutes the vehicle started. The contact stated that recently the failure had become more frequent. The contact had taken the vehicle to a dealer however, the mechanic was unable to determine the cause of the failure. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 1,000.”
Owner complaint to NHTSAFiled Feb 22, 2023Electrical system, EngineODI 11508611
“The contact owns a 2008 Hummer H3. The contact stated that the vehicle failed to start. The anti-theft system warning light illuminated. The contact waited 10 minutes for the vehicle to reset, per the vehicle Owner’s Manual instruction. The contact was able to drive the vehicle. The contact stated that the failure reoccurred increasingly several times per day. Additionally, the vehicle had taken 45 to 90 minutes to reset and restart. The vehicle was towed to an independent mechanic on two occasions; however, the mechanic was unable to duplicate the failure as the vehicle would restart as needed while at the dealer. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed nor repaired. The failure mileage was approximately 101,421.”
Owner complaint to NHTSAFiled Feb 8, 2023Electrical systemODI 11506213
“The contact owns a 2008 Hummer H3. The contact stated that upon shifting into drive (D) or reverse (R) the doors of the vehicle would unlock automatically. There was no warning light illuminated. The contact also stated that upon pressing the power master door lock switch to lock the vehicle, all four doors were unlocked. Additionally, the contact stated after refilling the gas tank at the gas station, the vehicle failed to restart and made an abnormal clicking sound. The contact stated that upon inspecting the hood of the vehicle, he saw flames on the positive side of the battery and the flames extended to the oil stick. The contact was able to extinguish the fire by taping it with a towel. The vehicle failed to start and remained at the gas station. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 132,000.”
Owner complaint to NHTSAFiled Oct 7, 2022Electrical systemFire reportedODI 11488302
“SECURITY SYSTEM STOPS IT FROM CRANKING AND I HAVE TO STAND OUTSIDE THE VEHICLE WITH IT LOCKED FOR 15 MINUTES SO IT WILL RESET. WIRING BURNT UP AND I HAD IT REPLACED AND THE RADIO, A/C, AND TEMP GAUGE STILL DOESN'T WORK”
Owner complaint to NHTSAFiled Oct 10, 2020Electrical systemODI 11363717

Showing 6 of 34 reports. Read every report on NHTSA.gov.

Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026NHTSA vehicle page

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.