Please HELP me with my TCM U fault
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Please HELP me with my TCM U fault in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; My car has lost communication to the TCM, now when i hock diagnostic machine to the dlc socket, the scan ...
  1. #1
    forumoto is offline Cadillac Owners Member
    Join Date
    Nov 2011
    Age
    93
    Posts
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    Please HELP me with my TCM U fault

    My car has lost communication to the TCM, now when i hock diagnostic machine to the dlc socket, the scan tool cannot see the tcm, i thought was fried tcm, i have got another one but yet still the problem persist, i have checked the dlc wiring on the socket, and i notice that class 2 wire isnt communicating to the TCM, i decided to test the wire with a little dc volt of 3 dc, now when i hock one end of the wire to the class 2 dlc pin and now went to the engine bay, took the harness off from the transmission and begin to test for continuity, there was no respond from there, i check also for the ecm and i got continuity there, as for the ecm, i have no problem because scan tool communicate, but i just test it for the purpose of this diag...

    now my cry out is, where can i locate the joint splice that connect the dlc to the tranny module.... i do not want to loss all the bulk cable... and also as the line did not come through to the tranny harness, i cannot identify it direct at the tranny harness, because i can see a lot of blue right at the tranny harness..

    thank you and i hope to read from someone soon...

    U2106 is my code
    P0700


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  3. #2
    forumoto is offline Cadillac Owners Member
    Join Date
    Nov 2011
    Age
    93
    Posts
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    Thread Starter

    Re: Please HELP me with my TCM U fault

    i have got the wiring harness diagram for the tcm and came to understanding that the class2 is not used there but rather uart/keyword200 is what is used and the wire show live through there, so automatic i will need to order a new tcm rather than relying on junk yard part, when it come to the ecm, sometimes lucky u get good one

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