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  • 3 weeks later...
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On 1/15/2026 at 10:20 PM, JerseySierra94 said:

I just installed these LEDs into my 2015 sierra but they flicker like crazy. All of the anti flicker harnesses online look like they plug into just the bulbs. Anyone know of a way to fix this? Is there a anti flicker device that plugs into the overall harness I’m missing?

 

https://www.formlights.com/2014-2018-gmc-sierra-1500-led-reflector-headlights-pair-1.html FNAF

 

GMC uses PWM, causing LED flicker. You need a proper CANbus anti-flicker decoder or relay harness, not just bulb adapters.

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