U057B code meaning
Invalid Data Received From Battery Charger Control Module C
What U057B means
Charger C is the third on-board charger slot. Some vehicles split AC charging over several units: the extended-range Ford F-150 Lightning, for example, offers 19.2 kW through a dual on-board charger. A Porsche patent describes such a group, in which only one charger is wired to the inlet and acts as master while the others are linked to it only by a communication line. U057B means data from charger C reach the network but fail the checks, so the master or charging controller cannot share the load with it. No manufacturer documents U057B or names a third charger publicly. U027A is total loss of contact. The usual result is reduced AC charging power; driving is unaffected.
U057B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U057B
- AC charging slower than expected
- Charging fault message in the display or app
Common causes of U057B
- Most likelyCharger C internally faulty
- PossibleCharger C on a different software level than master or charging controller
- Less likelyCommunication line between the chargers damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
On board charger
What each part of U057B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7B | The exact fault in that area. |
What to do next
- Note U057B 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 U057B
What does U057B mean?
U057B means "Invalid Data Received From Battery Charger Control Module C". Charger C is the third on-board charger slot. It is a generic code, so it means the same on every make.
Is it safe to drive with U057B?
U057B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U057B fail an emissions test?
U057B 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 U057B to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will U057B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.