DTC U0138-47: Lost Communication with All Terrain Control Module - Watchdog/safety Micro Controller failure: Action
- Using the manufacturer approved diagnostic system check terrain optimization module for related DTCs and refer to the relevant DTC index
- Using the manufacturer approved diagnostic system complete a CAN network integrity test
- Refer to the appropriate system wiring diagrams and check the power and ground connections to the terrain optimization module
- Check CAN harness between engine control module and terrain optimization module. Repair as necessary