Network, generic

U057C Invalid Data Received From Battery Charger Control Module D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Power module or slave controller D faulty
Charger software not matched across units
Overheating of unit D due to coolant or fan problems, corrupting its status data

Symptoms

  • Charging power lower than usual or charging stops
  • Charging system warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–4 h

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

Parts involved

on board charger

Related codes

U027BU057BU049CU04BE

References: patents.google.com, law.cornell.edu.