What it means
A receiving control module has detected invalid data from Battery Charger Control Module D. The code does not specify which data is invalid or why.
How it works
Battery Charger Control Module D reports charging-system information to other modules over the vehicle network. A receiving module sets this code when data attributed to module D fails its validity checks; the code alone does not identify the bad value or prove that the charger itself has failed.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save freeze-frame data and communication codes to identify which module logged U057C and whether other network faults appeared at the same time.
- Check live data for Battery Charger Control Module D and compare its reported charging values and status with related modules and the conditions recorded when the code set.
- Inspect module D's connectors and nearby harness for looseness, corrosion, water ingress, damage, or signs of a recent repair.
- Check the module's power, ground, and network wiring using the vehicle wiring diagram and the manufacturer's specification.
- If wiring checks pass, check for applicable software updates or configuration requirements and test the charger module and gateway communication using the manufacturer's diagnostic procedure.
Common fixes
- Repair a loose, corroded, wet, or damaged connector at Battery Charger Control Module D.
- Repair damaged power, ground, or network wiring to module D.
- Update or correctly configure a replacement charger module if the manufacturer specifies a software or compatibility correction.
- Replace Battery Charger Control Module D if its inputs and outputs remain invalid after wiring and software checks.
- Repair or replace the gateway if testing confirms it is routing module D's messages incorrectly.
Can I keep driving?
If charging warnings appear or charging functions are unavailable, avoid relying on the vehicle's charging system until the fault is diagnosed. Stop if the vehicle displays a high-voltage system warning or loses power, and arrange qualified service.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.