DTC P279D-64: Four Wheel Drive (4WD) Range Signal Circuit - Signal plausibility failure: Action
- If several CAN fault DTCs are logged, using JLR approved diagnostic equipment, perform a CAN network integrity test. Refer to the appropriate system wiring diagram and check the high speed CAN bus (FlexRay) circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- If the CAN fault DTC occurs in isolation, check the CAN circuits between the transmission control module and the transfer case control module