P0850

P0850-PARK/NEUTRAL SWITCH PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The transmission PRNDL diagnostics will detect transmission stuck in park error, if the vehicle speed is greater than a calibrated threshold and selected gear is PARK according to the received CAN message. It will also detect transmission stuck in drive error, if the engine crank state is seen while the selected gear is DRIVE according to the received CAN message.

- When Monitored:
When the vehicle is moving.

- Set Condition:
Vehicle speed is detected while the transmission reports that the vehicle is in park.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
TRANSMISSION STUCK IN PARK

See repair.

Repair

- Repair the transmission/CAN related problem.