U042EInvalid Data Received From Generator A Control Module
- Generic OBD-II code · Network
- How the car detects it
- U042E points to the regulator of generator A, on many Ford models a smart alternator that the PCM commands over a LIN line and that answers with load, temperature and fault status. The PCM stores U042E when those answers come back distorted or implausible; if they stop altogether, U012D is set instead, and U0284 often joins because grille shutters may share the line. Ford's 2014 code list names the module generator control module and gives no MIL flag. Ford bulletins trace the trio of U012D, U0284 and U042E to wiring: water in connector C1050 on the 2022 Maverick 2.0 L, where the MIL comes from oxygen sensor codes P0036 and P0138 instead (SSM 50973), and LIN wire VE181 chafing to ground at a bracket of the left engine mount on the 2021-2022 F-150 2.7 L (SSM 50737). Expect a charging warning and a draining battery. U044D is generator B.
- What you may notice
- Check charging system message or battery lamp
- Battery runs down, starting problems
- Grille shutter codes stored at the same time
- Likely causes
- LikelyChafed or shorted LIN wire between PCM and generator
- LikelyWater intrusion or corrosion in a connector of the LIN circuit
- PossibleFaulty voltage regulator of the generator
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.