What it means
The vehicle bus reports loss of communication with battery charger control module D. 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 D coordinates its assigned high-voltage battery charging functions with other vehicle systems. The bus monitors for Module D's messages, and this code sets when they stop arriving, potentially interrupting charging or contributing to 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 preserve freeze-frame and charging-related codes to tell whether Module D is the only node offline.
- Check whether AC charging is affected and note any charging, power, or check-engine warnings.
- Inspect accessible low-voltage wiring and the connector to Module D for corrosion, damage, or looseness without disturbing high-voltage parts.
- Check Module D's low-voltage power and ground to the manufacturer's procedure.
- Have the bus wiring and module assessed using the manufacturer's high-voltage safety procedure before considering replacement.
Common fixes
- Reconnect or clean an accessible loose Module D connector.
- Repair damaged low-voltage bus wiring serving Module D.
- Restore Module D's low-voltage power or ground.
- Replace Module D if its supplies and bus circuit are sound but communication remains absent.
Can I keep driving?
Charging may be limited and the vehicle may reduce available power, so plan around the charge already present and heed any warnings. Keep clear of high-voltage components and seek prompt diagnosis if charging stops or a high-voltage warning appears.
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.