Two problems related to headlights turn off while driving have been reported for the 2004 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Impala based on all problems reported for the 2004 Impala.
Driving down the road with my high beams on, my headlights went out completely. My low beams work ok but if I use high beams they randomly go out. This is the second gm vehicle I have had with this problem. The mechanic at the gm dealership said 4 of his 6 family members have had same problem. A former CO-worker had same problem. I contacted gm and was told my car was to old for them to fix it. . .
While driving on the freeway on a black night the headlights suddenly went out completely. The dash lights remained on and everything else was normal. After braking to an emergency stop I discovered that if I flicked the dimmer switch the lo-beam would come on. Some time later, when I flicked the dimmer switch the hi-beams came back on. This situation happened periodically since then but I could also regain some light by flicking the dimmer. On September 4, 2015 on a busy highway at night the lights went out and I could not flick the dimmer switch. It would not click. It seemed to be jammed so no lights. At present I have headlights (bright only) if I hold the dimmer switch up. As soon as I let it go all lights go out.