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 ...
- 07-14-12 03:35 PM #1Cadillac Owners Member
- Join Date
- Nov 2011
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
- 07-15-12 04:54 AM #2
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