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  1. 4L80E PCS Simple Shift - 81 Code

    Transmission - Rearend
    I have been getting an 81 code which is a 2-3 solenoid electrical fault. I replaced the solenoid and the code came back. So then I replaced the internal harness (the plug seemed a little worn). The code came back... Oh and all ac delco parts. SO then I took the TCU harness out and noticed there...