Two problems related to headlights have been reported for the 1999 GMC Sonoma. The most recently reported issues are listed below.
Whenever turn signal is activated, day time running lights go out. After turn signal goes off, daytime running lights come back on. Dealer/ manufacturer are aware of the problem. Problem has not been corrected.
Headlights cut off when the signal lights are applied, then come back on. Also when driver parks the vehicle the headlights are out. Dealer can't find solution.
| Headlights problems | |
| Turn Signal Switch problems |