Possible Causes
- The powertrain control module has received an indication about the component that indicates a failure for example an intelligent actuator or sensor is indicating an internal fault
- LIN_B circuit and Glow plug control module circuit short circuit to ground, short circuit to power, open circuit, high resistance
- Connector is disconnected, connector pin is backed out, connector pin corrosion
- LIN_B circuit or Glow plug control module failure