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Brandon C

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  1. Brandon C
    Check service bulletin #20-NA-218
  2. Brandon C
    Brandon C joined the community
  3. Brandon C
    Possible fix!!! My 2021 Sierra 1500 AT4 failed to start twice in the last month. Each time I waited several minutes and it eventually started. I just got back from the dealer and they found two codes in the history (P0300 and P12A6). They referenced service bulletin #20-NA-218 and reprogrammed the ECM. supposedly this is the fix for the starting issues. I will update if it happens again.
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