U301DControl Module Wake-up Circuit A Performance
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U301D says wake-up line A is electrically intact but its level does not fit what the module expects at that moment. Ford uses it in the battery energy control module of the 2019 Fusion Energi plug-in hybrid. Its OBD summary files the code under the charging performance checks: while the charger is precharging and its output voltage is already within the window for closing the charge contactors, the BECM still sees the charge wake-up line low before it has asked for the contactors to close. Ford's TSB 18-2386 and SSM 47630 report U301D with a lit MIL after charging on cars built up to 2 Oct 2018; if it is the only BECM code, the PCM and BECM are reprogrammed together (0.5 h) under the emissions warranty. Charging is normally unaffected, but the MIL stays on until cleared.
- What you may notice
- MIL on after a charging session
- Code is the only entry in the battery control module
- Likely causes
- LikelyBECM and PCM software judging the wake-up timing too strictly
- PossibleOn-board charger raising its wake-up signal late or unsteadily
- RareHigh resistance in the charge wake-up wire or connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.