A blown fuse or poor power/ground connection at the wireless accessory charging module.; Damaged or corroded wiring or connectors on the controller area network (CAN) bus segment serving the module.; The wireless accessory charging module itself has failed internally and stopped communicating.; A faulty gateway module or body control module that routes messages to and from the charging module.; Low battery voltage or a weak battery causing intermittent network communication dropouts.; Water intrusion or physical damage to the charging module or its harness, often from spilled drinks or cabin leaks.; Aftermarket accessories or improper electrical repairs that disturb the network wiring.

DTC codes / U02xx · Lost communication with a control module / U020C

U020CLost Communication With Wireless Accessory Charging Module A

U020C is a network communication code indicating that a control module on the vehicle's data bus has lost contact with the wireless accessory charging module, which is the component responsible for wirelessly charging compatible phones or devices in the cabin. The computer detected that expected periodic messages from that module stopped arriving within the required time window, so it flagged the module as missing from the network.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaLost communication with a control module

Symptoms you may notice

The wireless charging pad does not charge a compatible device, or charging stops intermittently.
A warning light or message on the dashboard indicates a communication or charging system fault.
Other modules may log unrelated communication codes if the network segment is affected.
The charging pad may appear completely dead with no indicator light or response.
Often no symptoms besides the warning light, especially if the vehicle does not use the wireless charger.
In some vehicles, related convenience features such as phone-as-key or wireless projection may act erratically.

Common causes, most likely first

A blown fuse or poor power/ground connection at the wireless accessory charging module.
Damaged or corroded wiring or connectors on the controller area network (CAN) bus segment serving the module.
The wireless accessory charging module itself has failed internally and stopped communicating.
A faulty gateway module or body control module that routes messages to and from the charging module.
Low battery voltage or a weak battery causing intermittent network communication dropouts.
Water intrusion or physical damage to the charging module or its harness, often from spilled drinks or cabin leaks.
Aftermarket accessories or improper electrical repairs that disturb the network wiring.

How to diagnose and fix it

Verify battery voltage and charge or replace the battery if it is below specification, then clear codes and retest.
Check the fuse and ground for the wireless accessory charging module, and inspect the connector for corrosion or loose pins.
Perform a visual inspection of the CAN bus wiring and connectors between the gateway and the charging module for damage or chafing.
Use a scan tool to check for communication with the wireless charging module directly; if it does not respond, proceed with circuit testing.
Measure resistance and voltage on the CAN bus lines at the module connector to confirm the network is intact and the module is receiving power and ground.
If power, ground, and network signals are good but the module does not communicate, substitute a known-good module or perform a module replacement and configuration.
After repair, clear all codes, cycle the ignition, and verify that the wireless charging module communicates and the code does not return.

When the charger still works but the code sets

A wireless charging module that still charges a phone can still set U020C if its network messages are intermittent, so do not assume the module is good just because charging works.
The code often appears after battery replacement or jump-starting because voltage spikes can temporarily disrupt module communication, and it may clear after a few drive cycles if no hard fault exists.
A faulty gateway module can cause U020C even when the charging module is fine, because the gateway routes messages between network segments and a gateway fault can isolate the charging module.
Aftermarket phone mounts or charging accessories plugged into the same circuit can backfeed voltage and disturb communication, so check for non-factory electronics before replacing parts.
Some vehicles require the wireless charging module to be configured or initialized with a scan tool after replacement, and skipping this step will leave U020C stored even with a new module.

Can I keep driving with U020C?

The vehicle remains safe to drive because the wireless charging module is a convenience feature and does not affect engine, steering, or braking operation. Avoid relying on the wireless charger until the fault is repaired, and address any low battery voltage promptly to prevent related communication codes.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.