DTC U0256-87 Lost Communication With Front Controls Interface Module "A" - Missing message: Action
- Refer to the appropriate system wiring diagrams and check the power and ground connections to the integrated control panel. 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 integrated control panel as necessary
- Install a new central junction box as necessary
- Install a new automatic temperature control module as necessary