2005 Hummer H2 electrical system problems
27 owner complaints filed with NHTSA name the electrical system on the 2005 Hummer H2 — 34% of all complaints for this model year.
What owners report
“The contact owns a 2005 Hummer H2. The contact stated that while parking in the mountains, the vehicle was in the park position, and it unexpectedly rolled and stopped at a boulder. There were no warning lights illuminated. The door hit the driver and knocked him to the ground, and he sustained an…”
filed Jul 29, 2025
“While traveling on the main roads the speedometer intermittently malfunctions then drops to zero, whereas I'm literally unable to determine my speed this seems to occur when the engine warms up and I been driving for better than a half hour.”
filed May 4, 2021
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8…
PIP4723J · Service Bulletin/Repair Instructions · issued Oct 25, 2024
Electrical System problems in other H2 years
| Year | Reports | Share |
|---|---|---|
| 2006 H2 | 4 | 18% |
| 2004 H2 | 14 | 24% |
| 2003 H2 | 24 | 17% |
Other reported problem areas on the 2005 Hummer H2
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.