What it means
The vehicle bus reports loss of communication with battery charger control module C. AC/DC charging coordination for the high-voltage battery via this node is suspended.
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
Battery Charger Control Module C coordinates its assigned part of high-voltage battery charging with the vehicle's other charging components. The vehicle bus expects status messages from Module C; this code sets when they are lost, which can interrupt charging coordination and may trigger a warning or reduced operation.
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 data and charging-related codes to determine whether Module C alone is offline or a wider high-voltage system fault is present.
- Note whether AC charging starts or stops and whether the vehicle displays a charging, power, or check-engine warning.
- Inspect the accessible low-voltage connector and bus wiring for Module C for damage, corrosion, or a loose connection; do not disturb high-voltage components.
- Have Module C's low-voltage power and ground checked using the manufacturer's procedure.
- Have the bus circuit and Module C tested according to the manufacturer's high-voltage safety procedures before replacing parts.
Common fixes
- Reconnect or clean an accessible loose or corroded low-voltage connector.
- Repair damaged low-voltage bus wiring to Module C.
- Restore a missing low-voltage power or ground supply.
- Replace Module C if its power, ground, and bus circuit pass checks but it does not communicate.
Can I keep driving?
The vehicle may have limited charging or reduced power, so avoid relying on it for a trip beyond its available charge and heed any power warnings. Do not open or probe high-voltage components; arrange prompt diagnosis if charging is unavailable or the vehicle reports a high-voltage fault.
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.