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About CCMC

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  • Location
    Brenham, TX
  • Drives
    2021 AT4 2500 4x4 Duramax
  1. Update, the dealership had to replace the trailer control module by the spare tire.
  2. My 2021 AT4 2500 Duramax is having an issue with the trailer running lights staying on with the truck off, lights off of auto, doors locked, etc. I didn't have the problem until I connected my daughters new camper trailer (incandecent running lights). And now my GN trailer with LED running lights stay on continuously. I now have an error that shows up to "check trailer wiring", I have verified that my trailer lights work as they should. I pinned out the connector on the truck trailer plug and confirmed that the running lights have 12v continuously. Is this correct? Has anyone else had this iss
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