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  1. J

    Service 4wd C0321 code

    Thanks
  2. J

    Service 4wd C0321 code

    Bought a 03 sierra with a service 4wd light. It had a no communication code so I bought a used transfer case control module, the old one was massively corroded inside. Now the communication code is gone but I have a c0321 transfer case lock circuit fault. Do I have to get the module programed...
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