U027C code meaning
Lost Communication With Off-Board Charger Control Module
What U027C means
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.
U027C at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U027C
- DC fast charging fails or does not start
- Charge failure notification on screen or in the app
- AC charging still possible
Common causes of U027C
- Most likelySupply or wake-up of the fast-charge controller missing
- PossibleController software outdated or update failed
- PossibleBus wiring or connector to the controller faulty
- Less likelyFast-charge controller internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Off board charger moduleVehicle bus wiring
What each part of U027C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7C | The exact fault in that area. |
What to do next
- Note U027C and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U027C
What does U027C mean?
U027C means "Lost Communication With Off-Board Charger Control Module". DC fast charging uses a charger outside the car, so the vehicle needs a controller that negotiates with the station. It is a generic code, so it means the same on every make.
Is it safe to drive with U027C?
U027C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U027C fail an emissions test?
U027C is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U027C to fix?
Difficulty: hard. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U027C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.