2003 Hummer H2 electrical system problems
24 owner complaints filed with NHTSA name the electrical system on the 2003 Hummer H2 — 17% of all complaints for this model year.
What owners report
“The pass lock keeps my vehicle from starting and stopping it at random, and has been doing this for years. Seems to happen to at least 85% of hummers out there if you check around, hummer forum and other places. This is very serious. Stops at intersections, and could on railroad tracks. I know that…”
filed Feb 27, 2021
“Tl* the contact owns a 2003 hummer h2. The contact stated that the vehicle failed to start. It took the contact up to thirty minutes to start the vehicle and the lock warning indicator illuminated. The vehicle was taken to an independent mechanic and the ignition switch was repaired, but the…”
filed Feb 19, 2019
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, 2024Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to…
General Communication · Service Campaign · issued Aug 26, 2024
Electrical System problems in other H2 years
| Year | Reports | Share |
|---|---|---|
| 2006 H2 | 4 | 18% |
| 2005 H2 | 27 | 34% |
| 2004 H2 | 14 | 24% |
Other reported problem areas on the 2003 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.