U012DLost Communication With Generator A Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U012D is stored when the powertrain controller loses contact with the regulator of generator A. In many Ford models this is the smart alternator, which the PCM commands over a LIN line that it often shares with the active grille shutters; for that reason U012D usually shows up together with U0284/U0285 and U042E. Ford bulletins name the culprits: water in connector C202 (Bronco Sport 1.5 L, SSM 49496, with MIL and/or Check Charging System), LIN wire VE181 shorted to ground against a bracket of the left engine mount (F-150 2.7 L, SSM 50737). Stellantis saw the same codes on a 2019 Renegade with an exposed shutter connector. Generator B uses U012F. The battery may run down.
- What you may notice
- Check Charging System message or battery lamp
- MIL on in some models
- Battery discharges, voltage unstable
- Active grille shutter codes stored as well
- Likely causes
- LikelyWater or corrosion in a connector of the shared LIN line (grille shutter, C202)
- PossibleLIN wire chafed and shorted to ground near an engine mount bracket
- PossibleGenerator regulator internally faulty or without supply
- RarePowertrain controller LIN driver faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.