U0138Lost Communication With All Terrain Control Module
- Generic OBD-II code · Network
- How the car detects it
- U0138 is logged when another module no longer receives the all-terrain control module, the unit behind the selector that lets the driver pick a terrain or drive mode such as snow, sand or mud and then adapts traction control, throttle response and shift points. Ford lists U0138 in the OBD code tables of its 2014 vehicles and marks it as available in all three self-test modes, without an entry in the lamp column. More public manufacturer detail is missing. CARB treats such a link as a digital input whose loss of communication must carry its own code. Implausible data from this module is U0439; the transfer case and AWD clutch use U0102 and U0114. The mode selector stops working and a 4WD or traction warning appears.
- What you may notice
- Terrain or drive mode cannot be selected
- 4WD or traction control warning lamp
- Likely causes
- LikelyFuse, supply, ground or CAN wiring of the terrain module faulty
- PossibleLoose or corroded connector at the module or the mode selector
- RareAll-terrain control module internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.