One headlight on during day with DRL

[Chrisd534]

Hey all, having an issue with my headlights I can't seem to figure out and wonder if anyone else had the same issue before I took it to the dealer. What's happening is my drivers side headlight is always on. When the truck is auto started or driving during the day the one headlight always stays on. When the truck turns off sometimes the one light will flicker like its trying to turn off before finally shutting down. Also there is no lights on the dash suggesting the lights are on. 

I had previously installed the illuminated gmc logo on the truck and after 2 years it got some water damage and failed. I figured it was because of that so I disconnected the inline connector but still having the same problem. 

Any help would be appreciated before I go to the dealer and they try blaming it on something stupid like a aftermarket CAI I attached a pic of the truck on while remote started

[redwngr]

Does it come on if you turn the headlights to 'ON' instead of 'auto'?

[Chrisd534]

4 hours ago, redwngr said:

Does it come on if you turn the headlights to 'ON' instead of 'auto'?

The light stays on no matter what position the switch is in. Even in off it stays on 

[sem308]

Was there any resolution to this? My 2021 GMC 2500 is having the same issue.

[KARNUT]

If you’re referring to daytime running lights? I always thought that was by design. Every GM truck I’ve owned since daytime running lights became a thing usually end up with one working. 

[Jus Cruisin]

3 hours ago, sem308 said:

Was there any resolution to this? My 2021 GMC 2500 is having the same issue.

The original poster has been gone for nearly a year. I doubt you'll get an answer from him. 

[silveradosid]

our 2021 denali had a problem with the left hand headlight, at first it would stay on and the it started flickering and then went out. the gmc headlights have a control module that is mounted on the bottom of the light, and moist will get into it. in our headlight the module was half full of water, this module is not sealed . dealership said i have to replace the whole headlight at 1500 bucks and it is on back order. found a really good used one and installed it. then took the module out of the old headlight to find the problem. you can't buy the module new but there is used ones on ebay. i have order a used one and waiting for it, and will sell the light when it works again