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Thread: U0100 code

  1. #1
    Potential Tuner
    Join Date
    Jul 2020
    Posts
    1

    U0100 code

    Hi, I was driving my Holden VE ss with E38 ECM when it just died and wouldn't start. Connected scanner and comes back with U0100 communication lost with ECM.
    Ok so I have had an ABS fault for some time, if the ABS module is faulty would that stop communication ? I can read the ECM at all but still can read TCM, also if I unplug Abs plug, hp won't even connect. I also tried another ECM and same deal.
    Anyone had this before ?

  2. #2
    Tuner in Training
    Join Date
    May 2020
    Location
    Mn
    Posts
    33
    Your high speed can bus has an issue. Check ecm power, ground, and serial data lines. The data lines should look similar to pins 6 and 14 on the dlc when they are measured to ground-regular DC voltage check.

    All modules need 3 things to operate. Power, ground, and data line(s). Your missing one. If not the module is faulty.

  3. #3
    Tuner in Training
    Join Date
    Jul 2018
    Location
    DENVER CO
    Posts
    20
    double check all grounds