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Thread: LB7 ECU will not read

  1. #1

    LB7 ECU will not read

    Hi,
    I have done a Engine swap in an GMC Yukon XL from a 8.1L to a 2004 Duramax. The only problem now is that when I try to read out the ECM IT says time out and When I try to do a read entire I Get the message Unlocker:x35 Invalid key. I have bought a used ECM and the same happend With that. Is IT something With my MPVi2 that is wrong? Or what is going no here? I tred to read the 8.1L ECM and that worked just fine.

    Regards
    Fredrik B?hle
    BG Racing, NORWAY

  2. #2
    Potential Tuner
    Join Date
    Dec 2020
    Posts
    1
    Same thing happened to me. But I was trying to read an already tuned ECM. Your problem might be that it is already Tuned by a different program.