DTC U0166-87: Lost Communication With Auxiliary Heater Control Module - Missing message: Action
- Refer to the appropriate system wiring diagrams and check the fuel fired booster heater power and ground circuits for open circuit, high resistance
- Using the manufacturer approved diagnostic system, perform a CAN network integrity test. Refer to the appropriate system wiring diagrams and check the medium speed CAN bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Using the manufacturer approved diagnostic system, check the fuel fired booster heater for related DTCs and refer to the relevant DTC index