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DTC codes / U05xx · Network communication / U057C

U057CInvalid Data Received From Battery Charger Control Module D

U057C is a communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the Battery Charger Control Module D. The computer detected a message from that module that failed its internal validity check, such as a missing checksum, out-of-range value, or counter mismatch, rather than a complete loss of communication.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaNetwork communication

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message
  • Often no symptoms besides the warning light, especially if the charging system still functions normally
  • A battery warning light or charging system message on the dashboard
  • Reduced or disabled automatic start-stop function
  • Inconsistent battery charging or a battery that drains overnight
  • Other unrelated warning lights due to shared network communication disruption

Common causes, most likely first

  1. Corroded, loose, or damaged wiring and connectors at the battery charger control module
  2. Failing battery charger control module D itself, often due to internal electronics faults or heat damage
  3. Low voltage or a weak 12-volt battery causing modules to send corrupted data
  4. CAN bus network faults such as a shorted or open data line, or interference from a faulty module on the same bus
  5. Software or firmware glitch in the battery charger control module requiring a reflash or update
  6. Water intrusion or physical damage to the module or its harness
  7. Poor ground connection shared by the charging system modules

How to diagnose and fix it

  1. Perform a full scan of all modules and record all stored codes, then clear codes and test-drive to see if U057C returns
  2. Inspect the battery charger control module connectors and harness for corrosion, loose pins, chafing, or water damage
  3. Test the 12-volt battery state of charge and perform a charging system output test to rule out low voltage as the root cause
  4. Check the CAN bus data lines for proper resistance and shorts using a multimeter or oscilloscope
  5. Verify power and ground supplies at the battery charger control module connector with a test light or multimeter
  6. If wiring and power are good, substitute a known-good module or perform a software update per manufacturer procedure
  7. After repair, clear codes and verify that U057C does not reset during a complete drive cycle

What most technicians overlook with U057C

  • A weak or failing 12-volt battery is a frequent hidden cause; modules can send invalid data when supply voltage dips during cranking or under load.
  • U057C often appears alongside other U-codes from different modules, pointing to a shared network or power issue rather than a single faulty charger module.
  • Replacing the battery charger control module without checking the CAN bus for intermittent shorts or interference can lead to a repeat failure.
  • Some vehicles set this code after a jump-start or battery replacement if the module's learned values are not reset properly.
  • The code can be stored historically and may not indicate a current fault if the charging system is working correctly and the light is off.

Can I keep driving with U057C?

If the charging system warning light is on or the battery is not charging, avoid long trips and have the vehicle checked promptly to prevent a no-start condition. If only the check engine light is on and the battery appears to charge normally, you can drive short distances but should schedule diagnosis soon.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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