U057D — Invalid Data Received From Off-Board Charger Control Module

Diagnostic algorithm

1. Record DTCs and freeze frame data. Note conditions when code set (charger type, connector, state of charge, voltages).
2. Reproduce the fault with the same off-board charger if safe to do so. Attempt charging with a known-good, compatible charger to see if code returns.
3. Visually inspect connectors, pins and harnesses between the vehicle and charger interface; repair any damage and reseat connectors.
4. Measure module supply and ground voltages while attempting communication to ensure stable power.
5. Use a diagnostic tool or CAN/LIN sniffer to capture bus traffic during a fault. Check that messages from the off-board charger have correct IDs, lengths, timing and valid checksums/CRC.
6. Compare captured message payloads against OEM expected values or protocol documentation to identify malformed fields or out-of-range values.
7. Check for related network errors (bus-off, arbitration errors). Repair wiring/termination or mitigate EMI if bus errors present.
8. Check software/firmware versions for the vehicle and off-board charger; apply manufacturer updates or patches if available.
9. If messages are invalid only with a specific charger, consult the charger manufacturer for compatibility and protocol details.
10. If wiring, power, and charger are verified good and the module still sends/receives invalid data, consider module replacement per OEM procedure.
11. After repairs or software updates, clear DTCs and verify multiple successful charge cycles to confirm the issue is resolved.