DTC U0166-87 Lost Communication With Auxiliary Heater Control Module - Missing message: Action
- Refer to the appropriate system wiring diagrams and check the power and ground connections to the fuel fired booster heater. Using the manufacturer approved diagnostic system, complete a CAN network integrity test
- Refer to the appropriate system wiring diagrams and check the CAN network
- Install a new fuel fired booster heater as necessary
- Install a new central junction box as necessary
- Install a new automatic temperature control module as necessary