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

Prioritized steps to perform:
Emergency park release has been used. Clear DTC and retest. If fault does not reoccur then no further action is required
If the emergency park release has not been used or status is unknown, continue with diagnostics detailed below
Check startup battery charge and condition and record values
Using the Jaguar Land Rover approved diagnostic equipment, read all DTCs and investigate any DTCs relating to startup battery voltage supply. Rectify as required
If fault persists, 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 DTCs
Start the vehicle and allow to reach normal operating temperature while engaging and disengaging Park with the gear selector several times
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 relevant service information and check the automatic transmission fluid quality For additional information, Refer to: TRANSMISSION OIL COLOR CHART If the automatic transmission fluid condition is unsatisfactory, raise a Technical Assist (TA) for further support
Using the Jaguar Land Rover approved diagnostic equipment, clear DTCs and retest
If the fault persists, raise a Technical Assist (TA) for further support