DTC P0683-88: Glow Plug Control Module 1 to PCM Communication Circuit - Bus off: Action
- Refer to the electrical circuit diagrams and check the glow plug control module circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Inspect connectors for signs of water ingress and pins for damage and/or corrosion
- Install a new glow plug control module, only when diagnosed as failed
- Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest