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2014 GMC Sierra - Headlights go out after a few seconds of the truck starting up.

JuanfromFiesta
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JuanfromFiesta New Member

JuanfromFiesta

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Hello! I am new to the forum game, but I didn't find a thread about the issue I have. I have a 2014 Sierra Denali with a 2018 exterior. The issue I have is that the headlights will go out after a few seconds of starting the truck. The lights will stay on indefinitely while the truck is off but after like 3 seconds of starting it, the lights will flicker once quickly and then go out. Scanner can read the signal from the switch getting to the bcm but the lights stay off. To make things stranger, the high beams work just fine, I can turn them on even after the lows go out but only the highs stay on. Is anyone having a similar issue?

 

TL;DR - 2018 Headlights on 2014 Sierra go out seconds after starting the truck. While truck is off they work fine. Highbeams work fine. Help.

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