DTC P0850-23: TCM Circuit Malfunction: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

System malfunction location	TCM circuit malfunction
Detection condition	With the ignition switched ON (engine off or on), it is detected that the transaxle range sensor CAN signal is P or N position for 1 s or more continuously for a continuous 5 or more times even though the TCM CAN signal is other than P and N position.
Fail-safe	Perform control of the internal signal for control of the transaxle range sensor as position other than P, N positions.
Possible cause	TCM connector or terminal malfunction Start stop unit connector or terminal malfunction Short to power supply in wiring harness between start stop unit terminal 1F and TCM terminal J Transaxle range sensor malfunction Start stop unit malfunction