U01BE: Lost Communication With Drive Motor A Clutch Control Module

What it means

ECU lost communication with the drive motor A clutch actuator (engages/disengages drive motor in some hybrid layouts).

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

The Drive Motor A Clutch Control Module operates or reports the clutch actuator that couples or uncouples drive motor A in some hybrid layouts. This code sets when the expected messages from that module are missing, which can prevent the vehicle from confirming the clutch state.

Common causes

Most likely first.

1. Actuator unpowered or wiring broken
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 all module codes, noting any hybrid, motor, or transmission warnings that appeared with the fault.
2. Use a compatible scan tool to check whether the Drive Motor A Clutch Control Module responds and whether its clutch status is available.
3. Inspect the actuator module’s power, ground, connector, and wiring for damage, corrosion, looseness, or water entry.
4. Check the communication wiring on the module’s network branch for opens, shorts, or poor connector contact.
5. If power and network wiring are sound, have gateway routing and CAN termination tested to the manufacturer’s specification.

Common fixes

• Restore the actuator module’s power or ground connection if it is loose or corroded.
• Repair damaged actuator or network wiring and connector terminals.
• Correct a confirmed gateway routing fault.
• Repair or replace a CAN terminating resistor if testing shows it is outside the manufacturer’s specification.

Can I keep driving?

Avoid driving if the vehicle displays hybrid or transmission warnings, loses drive, or engages unpredictably; the clutch state for motor A may not be confirmed. If it remains driveable without warnings, limit use and arrange prompt diagnosis because reduced or lost propulsion may occur.