U020C: Lost Communication With Wireless Accessory Charging Module A

What it means

Communication with Wireless Accessory Charging Module A 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 A manages the vehicle's 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 A; it does not identify the charging method or compatible devices.

Common causes

Most likely first.

1. Module unpowered
2. Gateway module routing CAN messages incorrectly
3. 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

1. Record freeze-frame data and scan all modules for communication codes to see whether only module A is missing or the fault affects several network modules.
2. Check the battery condition and relevant fuses and grounds for the charging module, since loss of power can stop its network messages.
3. Inspect module A's connectors and nearby wiring for looseness, corrosion, water ingress, or damage.
4. Use a capable scan tool to check whether module A responds and whether the gateway reports messages to or from it.
5. If several modules have communication faults, test the affected CAN network and termination against the manufacturer's specification before replacing a module.

Common fixes

• Restore a loose or corroded power, ground, or connector connection at module A.
• Replace a blown fuse after finding and correcting the cause.
• Repair damaged CAN wiring or connectors serving module A.
• Correct a gateway routing fault or CAN termination fault confirmed by testing.
• Replace module A only if power, ground, network wiring, and gateway communication check out.

Can I keep driving?

If the vehicle drives and charges normally, this fault may only disable the accessory charging function, but check for other warning lights and confirm essential functions work. Avoid relying on wireless accessory charging until communication is restored; multiple network faults or unexpected shutdowns warrant stopping safely and arranging diagnosis.