DTC U0001-88: High Speed CAN Communication Bus - Bus off: Action

Using the Jaguar Land Rover approved diagnostic equipment, carry out network integrity test
Refer to the appropriate system wiring diagrams and check high speed CAN network for short circuit to ground, short circuit to power, open circuit
Using the Jaguar Land Rover approved diagnostic equipment, check terrain response switchpack for DTCs and refer to the relevant DTC index
Using the Jaguar Land Rover approved diagnostic equipment, complete a CAN network integrity test. Refer to the appropriate system wiring diagrams and check terrain response switchpack power and ground circuits for open circuit. Check CAN harness between engine control module and terrain response switchpack, repair as necessary