One problem related to exterior lighting has been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.
Engine will turn over but never start, security lamp will come on-taken to dealer they said it was the security sensor was going out and that the truck thought I was stealing it, wait 10 minutes & truck will start. That works, but left stranded for over 40 minutes waiting for the sensor to let me start truck. Took 4 tries at 10 minutes each for the truck to finally start. Dealer knew right off what the problem was with out hooking up the vehicle to determine the problem.
| Headlights problems | |
| Exterior Lighting problems |