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po697 is this a tcm problem on 2012 chevy express 3500, 6.0liter

714 Views 9 Replies Latest reply: 2023-03-02 23:03:04


  •   Level 2   
    (32) points
    jm fields
    2023-02-23 20:18:17
    When this code kicks in usually on accel from a lite it goes into a limp type mode and shifts are far apart, the vehicle will go 58 mph, painfully.
    I have changed the battery, starter, alt, brake pedal, map sensor and throttle body.
    No other codes present however the dash shows stabilatrak.
    Cleared the code and reset the computer, may last a day or so.
    Ty for any help.

  •   Level 9   
    (3252) points

    2023-02-24 12:13:48 (Reply to:jm fields)

    Hi ,this code means problems in the electrical systems , check harness for open or
    shortage or poor connections check for. Faulty ecm,this is a seriously bad code that
    can be hard to solve without professionally help.

  •   Level 2   
    (32) points
    jm fields
    2023-02-25 21:21:11 (Reply to:)
    Update: were replaced the transmission has it had 200k on it.
    The same issue came back one day after install.
    Agh....

  •   Level 2   
    (32) points
    jm fields
    2023-02-26 22:38:44 (Reply to:jm fields)
    I have determined there must be a power supply issue of some sort.
    Got schematics and am pouring thru them.
    The trigger seems to be from a stop, then hit the accelerator, vehicle goes into limp
    mode and sets the code immediately.
    Will keep you posted.

  •   Level 9   
    (3252) points

    2023-02-28 18:55:44 (Reply to:jm fields)

    Hi, i read that there is also a stabilitrac problem, try to repair this first and look for abs
    codes.check if the tires front and rear are the same in size.

  •   Level 9   
    (3252) points

    2023-02-28 18:57:16 (Reply to:jm fields)

    Hi, i read that there is also a stabilitrac problem, try to repair this first and look for abs
    codes.check if the tires front and rear are the same in size.

  •   Level 2   
    (32) points
    jm fields
    2023-03-01 00:03:39 (Reply to:)
    Appreciate that however not the problem.
    The update right now is I have re-done all the ground cables and ends.
    My latest driving has only set the TCM comm code ???
    May try and re-flash the TCM and see how that goes.
    I will keep you updated.

  •   Level 2   
    (32) points
    jm fields
    2023-03-02 13:02:58 (Reply to:jm fields)
    Final post..for the most part it was the ground cable, I re-did all of them.
    The finishing fix for the trans was getting it remarried to the ECM.
    Chevy admitted some issues with the power cables as well.
    Always always always check you powers and grounds first.
    Ty

  •   Level 9   
    (3252) points

    2023-03-02 19:12:21 (Reply to:jm fields)

    Hi, thank you for your information about the ground cables.

  •   Level 2   
    (32) points
    jm fields
    2023-03-02 23:03:04 (Reply to:)
    I wish more people would tell us the solutions to there problems.
    Hope I start a trend....it helps.
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