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Ignore the P1815 for now, that's a minor inconvenience and probably just the microswitches on the shifter.
The other 3 codes are all related to the TCM not getting data from the ECM, disconnect the battery and get the car in the air and look for damage on the transmission harness, unplug the harness and look for corrosion/damage to the pins. Engine speed and throttle position data are all sent via CANBUS and you have a CAN communication error so that's likely where the problem lies.
That means I have to drop the tranny Pan and remove the valve body correct?
If the harness is okay what could be the next possible issue?
thanks for the feedback
I appreciate the help
