What it means
A receiving control module has detected invalid data from the Off-Board Charger Control Module. The code does not specify which data is invalid or why.
How it works
The Off-Board Charger Control Module manages charging from an external charging source and shares status data with other vehicle modules. A receiving module stores U057D when data identified as coming from that off-board charger fails its validity checks; the code does not say which value is wrong or why.
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 record freeze-frame data and communication codes, noting which module logged U057D and whether it occurred during or after a charging session.
- Use live data to compare the off-board charger's reported connection, charging, and fault status with the vehicle's charging system and the recorded conditions.
- Inspect the off-board charger module's connectors and harness for damage, corrosion, moisture, or loose connections, especially around charging equipment interfaces.
- Check module power, ground, and network circuits against the wiring diagram and manufacturer's specification.
- If circuits are sound, check module software and configuration, then test gateway routing and off-board charger communication using the manufacturer's diagnostic procedure.
Common fixes
- Clean and secure a loose or corroded off-board charger module connector.
- Repair damaged power, ground, or network wiring to the off-board charger module.
- Correct module software or configuration if a replacement or update caused a compatibility mismatch.
- Replace the off-board charger module if its reported data remains invalid after circuit and software checks.
- Repair the gateway only if network tests confirm it is misrouting the off-board charger's messages.
Can I keep driving?
Avoid using external charging if the vehicle reports a charging-system warning or the charge status is unreliable. If a high-voltage warning appears, stop charging and follow the vehicle's safety instructions.
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.