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Thread: ECM upgrade engine light

  1. 04-13-2023 #1
    achatha84
    achatha84 is offline
    Potential Tuner
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    Apr 2023
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    ECM upgrade engine light

    Hey, I upgraded my ecm with the upgrade kit, got an engine light no communication with ecm, truck runs fine except exhaust break won?t turn on any ideas?

    Thanks
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  2. 04-14-2023 #2
    Powerstrokecustoms
    Powerstrokecustoms is offline
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    did you read out the original ecm before upgrading??
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