What it means
Communication with Wireless Accessory Charging Module B was not received as expected. The code does not specify the charging technology or device compatibility.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
Wireless Accessory Charging Module B manages an accessory charging function and exchanges status messages over the vehicle network. This code is set when the reporting module does not receive expected messages from module B; it does not identify the charging method or compatible devices.
Common causes
Most likely first.
- Module unpowered
- Gateway module routing CAN messages incorrectly
- CAN terminating resistor (120 Ω) drifted out of spec
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
- Record freeze-frame data and scan all modules for communication codes to determine whether the missing messages are limited to module B.
- Check the battery condition and the fuses and grounds for module B, since an unpowered module cannot send network messages.
- Inspect module B's connectors and wiring for damage, corrosion, water ingress, or a loose connection.
- Use a capable scan tool to check whether module B responds and whether the gateway reports messages to or from it.
- If other modules also report lost communication, test the relevant CAN network and termination against the manufacturer's specification.
Common fixes
- Repair a loose, corroded, or damaged power or ground connection at module B.
- Replace a blown fuse after correcting any underlying short or overload.
- Repair damaged CAN wiring or connector terminals serving module B.
- Correct a confirmed gateway routing or CAN termination fault.
- Replace module B if its power, ground, wiring, and network path test correctly.
Can I keep driving?
If the vehicle drives normally, this fault may leave the accessory charging function handled by module B unavailable. Do not rely on that charging function until repaired, and stop safely if other warnings or shutdowns affect driving.
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.