One problem related to fuel injector has been reported for the 2003 GMC Sierra. The most recently reported issues are listed below.
2003 GMC Sierra duramax 3 injectors failed and replaced under warranty @ 25,000 miles 8 injectors failed and replaced @ 35,000 miles and replaced under warranty 4 injectors failed @ 120,000 and no warranty coverage obviously there is an injector problem.
| Fuel Injector problems | |
| Tank Filler Pipe And Cap problems | |
| Gasoline Fuel System problems |