U057C code meaning
Invalid Data Received From Battery Charger Control Module D
What U057C means
U057C covers the fourth charger slot. Large chargers are often built from parallel power modules: Hyundai's patent for a vehicle-mounted charger gives each module its own slave controller that reports to a master, which can drop to a single module once the battery reaches the constant-voltage phase. If the reports from unit D are implausible, the master cannot decide how to share current and stores U057C; a missing unit gives U027B instead. No manufacturer documents U057C or a fourth charger publicly. For plug-in hybrids CARB requires the OBD system to detect charger faults that block charging or limit the rate, but whether a lamp comes on is up to the maker. Expect reduced or interrupted AC charging.
U057C 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 U057C
- Charging power lower than usual or charging stops
- Charging system warning
Common causes of U057C
- Most likelyPower module or slave controller D faulty
- PossibleCharger software not matched across units
- Less likelyOverheating of unit D due to coolant or fan problems, corrupting its status data
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 U057C 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 U057C 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 U057C
What does U057C mean?
U057C means "Invalid Data Received From Battery Charger Control Module D". U057C covers the fourth charger slot. It is a generic code, so it means the same on every make.
Is it safe to drive with U057C?
U057C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U057C fail an emissions test?
U057C 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 U057C to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will U057C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.