U044DInvalid Data Received From Generator B Control Module
- Generic OBD-II code · Network
- How the car detects it
- U044D names the generator B control module. Ford uses the A version for its LIN-controlled alternator: in SSM 50737, 2021-22 F-150 trucks with the 2.7L EcoBoost warn about the charging system and store U012D and U042E in the PCM because a LIN wire rubs through to ground close to the engine mount on the left. A B unit would then be the regulator of a second alternator, as found on trucks with dual generators; Ford's 2014 code list already contains circuit codes for generator 2. U044D is set when that regulator answers but its status, load or fault data are invalid; U012F is lost contact. No manufacturer documents U044D publicly. The engine computer then cannot steer the second alternator reliably, so charging capacity may drop and a battery or charging warning may appear.
- What you may notice
- Battery or charging system warning
- Low charging voltage under high electrical load
- Likely causes
- LikelyChafed or shorted LIN wire to the second alternator
- PossibleFaulty voltage regulator of alternator B
- RareSecond alternator not configured correctly in the engine computer
- 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.