What it means
The vehicle bus reports loss of communication with the off-board charger module. Negotiation with external DC fast-charge stations (CCS, CHAdeMO) and the resulting charging session cannot start.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
The Off-Board Charger Control Module manages communication with an external DC fast charger so the vehicle and charging station can agree on a charging session. This code sets when the vehicle bus loses the module's messages, which can prevent a DC fast-charge session from being negotiated or started.
Common causes
Most likely first.
- Bus wiring open or shorted
- Module without power or ground
- Module failed
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 and charging-related codes to determine whether the Off-Board Charger Control Module alone is missing from the bus.
- Check whether AC charging still works and record any message shown when attempting DC fast charging, which helps isolate the affected charging path.
- Inspect accessible low-voltage connectors and bus wiring for the Off-Board Charger Control Module for looseness, corrosion, or damage; avoid touching high-voltage parts.
- Check the module's low-voltage power and ground using the manufacturer's procedure.
- Have the bus circuit and module tested under the manufacturer's high-voltage safety procedures before replacing components.
Common fixes
- Reconnect or clean an accessible loose or corroded module connector.
- Repair damaged low-voltage bus wiring to the Off-Board Charger Control Module.
- Restore the module's low-voltage power or ground supply.
- Replace the module if its supplies and bus circuit are confirmed sound but it remains offline.
Can I keep driving?
Expect DC fast charging to be unavailable; use another compatible charging method only if the vehicle confirms it is operating normally. Do not probe high-voltage charging hardware, and arrange diagnosis promptly if charging warnings or reduced power occur.
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.