U014B: Lost Communication With Hybrid/EV Battery Inductive Charging Module

What it means

ECU lost CAN communication with the inductive charging module (wireless charging of HV battery). A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

The inductive charging module manages wireless charging of the high-voltage battery and shares status with other controllers over the CAN network. U014B sets when the reporting controller stops receiving the expected messages from that specific module, so wireless charging status may be unavailable.

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. Scan all modules and save freeze-frame and communication codes to see whether U014B is current and whether other controllers also cannot reach the inductive charging module.
2. Check the 12-volt battery condition and charging system because low system voltage can interrupt module communication.
3. With the vehicle safely powered down as specified by its service information, inspect the inductive charging module's accessible power, ground, and CAN connectors for looseness, corrosion, moisture, or damage.
4. Use a wiring diagram to verify the module's power and ground under the specified conditions before suspecting the module itself.
5. Have the CAN wiring and network termination checked against the manufacturer's procedure; do not measure resistance on a powered network.
6. If power, ground, and network wiring pass, check gateway message routing and whether the inductive charging module responds to a compatible scan tool.

Common fixes

• Restore a weak 12-volt battery or repair its charging-system fault.
• Reconnect or repair a loose, corroded, or damaged module connector.
• Repair an open, short, or poor connection in the CAN wiring or its termination as identified by testing.
• Correct gateway configuration or routing if testing identifies it as the cause.
• Replace or reprogram the inductive charging module only after its power, ground, and network have been verified.

Can I keep driving?

If the vehicle drives normally, a short trip may be possible, but avoid relying on wireless high-voltage battery charging and heed any hybrid or EV system warnings. Stop safely if the vehicle limits power or displays a high-voltage system warning; arrange prompt diagnosis because charging or related functions may be unavailable.