Transmission Control Switch (TCS)

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTE:

Guided Diagnostics must be followed and the repair advised by the process completed. Failure to do so may result in the rejection of any warranty claim made.
If a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval program is in operation, prior to the installation of a new module/component.
Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the Jaguar Land Rover approved diagnostic equipment).
When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places. For example, on the 2 volts range can measure 1 mV or 2 kΩ range can measure 1 Ω. When testing resistance always take the resistance of the digital multimeter leads into account.
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.
If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.
Check JLR claims submission system for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required.

The DTC Index lists all Diagnostic Trouble Codes (DTCs) that could be logged in the Transmission Control Switch (TCS). For additional diagnosis and testing information, refer to the relevant Diagnosis and Testing service information. For additional information, Refer to: EXTERNAL CONTROLS

DTC	DESCRIPTION	POSSIBLE CAUSES	ACTION
P084F-11	Park/Neutral Switch Output Circuit - Circuit short to ground	NOTE: Circuit reference - PN SIGNAL - Park/neutral output signal circuit short circuit to ground Transmission control switch internal failure	Refer to the electrical circuit diagrams and check the park/neutral output signal circuit for short circuit to ground. Repair the wiring harness as necessary Using the manufacturer approved diagnostic system, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
P084F-12	Park/Neutral Switch Output Circuit - Circuit short to battery	NOTE: Circuit reference - PN SIGNAL - Park/neutral output signal circuit short circuit to power Transmission control switch internal failure	Refer to the electrical circuit diagrams and check the park/neutral output signal circuit for short circuit to power. Repair the wiring harness as necessary Using the manufacturer approved diagnostic system, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
P084F-13	Park/Neutral Switch Output Circuit - Circuit open	NOTE: Circuit reference - PN SIGNAL - Park/neutral output signal circuit open circuit, high resistance Transmission control switch internal failure	Refer to the electrical circuit diagrams and check the park/neutral output signal circuit for open circuit, high resistance. Repair the wiring harness as necessary Using the manufacturer approved diagnostic system, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
P085D-68	Gear Shift Control Module "A" Performance - Event information	Transmission control switch internal failure	Using the manufacturer approved diagnostic system, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
P085D-96	Gear Shift Control Module "A" Performance - Component internal failure	Transmission control switch internal failure	Using the manufacturer approved diagnostic system, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
P085D-97	Gear Shift Control Module "A" Performance - Component or system operation obstructed or blocked	NOTE: This DTC may be induced by the driver holding the transmission control switch and opposing its automatic movement. Transmission control switch movement obstructed Transmission control switch internal failure	Check the operation of the transmission control switch and ensure nothing is jamming or obstructing the mechanism. Rectify as necessary Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transmission control switch
U0028-87	Vehicle Communication Bus A - Missing message	Transmission control module power or ground circuit open circuit, high resistance High speed CAN bus (powertrain) circuit short circuit to ground, short circuit to power, open circuit, high resistance Transmission system fault	Refer to the electrical circuit diagrams and check the transmission control module power and ground circuits for open circuit, high resistance. Repair the wiring harness as necessary Using the Jaguar Land Rover approved diagnostic equipment, perform a CAN network integrity test. Refer to the electrical circuit diagrams and check the high speed CAN bus (powertrain) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary Using the Jaguar Land Rover approved diagnostic equipment, check the transmission control module for related DTCs and refer to the relevant DTC index
U0028-88	Vehicle Communication Bus A - Bus off	High speed CAN bus (powertrain) circuit short circuit to ground, short circuit to power, open circuit, high resistance	Using the manufacturer approved diagnostic system, perform a CAN network integrity test. Refer to the electrical circuit diagrams and check the high speed CAN bus (powertrain) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
U0028-92	Vehicle Communication Bus A - Performance or incorrect operation	Transmission control module power or ground circuit open circuit, high resistance High speed CAN bus (powertrain) circuit short circuit to ground, short circuit to power, open circuit, high resistance Transmission system fault	Refer to the electrical circuit diagrams and check the transmission control module power and ground circuits for open circuit, high resistance. Repair the wiring harness as necessary Using the Jaguar Land Rover approved diagnostic equipment, perform a CAN network integrity test. Refer to the electrical circuit diagrams and check the high speed CAN bus (powertrain) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary Using the Jaguar Land Rover approved diagnostic equipment, check the transmission control module for related DTCs and refer to the relevant DTC index
U3000-00	Control Module - No sub type information	Car configuration file mismatch with vehicle specification Incorrect transmission control switch installed	NOTE: After updating the car configuration file, set the ignition to on and wait 30 seconds before clearing the DTCs. Using the manufacturer approved diagnostic system, check and update the car configuration file as necessary. Clear the DTCs and retest Install a new transmission control switch as necessary