DTC P0850-29: Park/Neutral Switch Input Circuit - Signal invalid: Action

NOTE: This DTC may be set following a valid emergency park release operation. Establish if the emergency park release has been used on this vehicle

Prioritised steps to perform:
Check the integrity of the emergency park release mechanism. Rectify as necessary
Check the integrity of the parklock mechanism. Rectify as necessary
Using the Jaguar Land Rover approved diagnostic equipment, clear the Diagnostic Trouble Code(s)
Start the vehicle and allow to reach normal operating temperature while engaging and disengaging Park with the gear selector several times
If fault persists, check the transmission fluid level using the Jaguar Land Rover approved diagnostic equipment to run the 8-speed ZF - Automatic Transmission Fluid Level Check Application
Refer to the appropriate service information and check the automatic transmission fluid quality. If the condition is unsatisfactory, raise a Technical Assist (TA) for further support
Clear Diagnostic Trouble Code(s) and retest
If the fault persists, raise a Technical Assist (TA) for further support