Sampson, sounds like a bunt out bulb, which will need changed.
If you feel comfortable doing it yourself. Basically three screws, and you have to pull one plastic fastener from the fascia (bumper) and pull the bumper back a bit, and pull the assembly out. I believe it is in the manual, not bad to do. I will post a link to tell or show you how to do it. Press the helpful button
Headlight Change 2005 2009 Buick LaCrosse 2006 Buick LaCrosse CX 3 8L V6
2008 Buick LaCrosse Headlight Replacement
Thread how do replace the headlight bulb in 2005 buick lacrosse
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Headlight Change 2005 2009 Buick LaCrosse 2006 Buick...
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Call NHTSA, could be part of the Headlight recall.
The daytime running lights are incorporated within the high beam lighting circuit. If the bulb is not at fault, you may have a daytime running light module/circuit failure
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I have a 2008 3.8l, v6. And I took it to the Buick Dealership, since it was part of a recall, it was free of charge. Call GMC and have your VIN # ready, your Year may be included in the recall.
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