Network, generic

U027C Lost Communication With Off-Board Charger Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

DC fast charging uses a charger outside the car, so the vehicle needs a controller that negotiates with the station. Ford has a module with almost this name in its battery-electric vehicles: the off-board charger controller (OBCC) of the Mustang Mach-E, E-Transit and F-150 Lightning. Ford reprogrammed it in program 22B48 and SSM 50923 because some stations aborted DC charging, and SSM 52130 tells technicians to disregard P1A3C in the OBCC after an interrupted fast-charge session. Whether Ford stores U027C when the OBCC goes silent is not published, and no other maker documents the code. Without this module DC fast charging is not possible, while AC charging through the on-board charger normally still works. Driving is unaffected.

Likely causes

Supply or wake-up of the fast-charge controller missing
Controller software outdated or update failed
Bus wiring or connector to the controller faulty
Fast-charge controller internally faulty

Symptoms

  • DC fast charging fails or does not start
  • Charge failure notification on screen or in the app
  • AC charging still possible

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,500
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

off board charger modulevehicle bus wiring

Related codes

U057DU019BP0CF4

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.