Three times while driving at 50-60 miles per hour vehicle had total engine shut down. This occurred after driving approximately 2 hours. Coasted to the side of the road turned key off and waited 5 minutes or so and engine restarted. The third times happened around 10 miles or 15 minutes later and took at least 20 minutes before restart. When attempting restart multiple times there were no alarm/warning/engine lights come on. This is the cab to a class c motorhome.
Engine & cooling
2012 GM G4500 Engine problems
Owners have filed 1 complaint about the 2012 GM G4500's engine & cooling with NHTSA - 100% of all its complaints, most recently on July 3, 2025. Stalling, loss of power, oil consumption, overheating, head gaskets, timing chains and engine failure.
- Complaints
- 1
- Recalls
- 0
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
Engine complaints
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data