Originally Posted by
CL770
I've read through your post and I agree that the conductor plate was the most likely cause of the issue. However, I can't see where you've cleared the original faults from the TCU. The transmission will not work properly until those original faults are cleared from the TCU, especially if it's been in permanent limp mode. If the transmission has been playing up for a while, you should also clear all the shift adaptations as well.
That's what was weird about it: my car never entered limp mode or had a check engine light. The transmission just dies; it's an intermittent problem that can happen whenever. I would think that once an error code like this occurs, it should be manually cleared so the car will drive properly, but what do I know? When the plate was replaced, there were no error codes presented; the issue came back. Right now I'm looking into the CAN bus connections between the TCM, PTCM, and CAB and at splices S122 and S123 on the circuit diagrams.