U012C: Lost Communication With Active Vibration Control Module

What it means

ECU lost CAN communication with active vibration control module (used in some hybrid drivetrains to dampen vibrations).

At a glance

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

How it works

The Active Vibration Control Module manages vibration-damping functions used in some hybrid drivetrains and communicates with other controllers over the vehicle network. This code sets when expected messages from that module are missing, which can happen if it loses power, its network connection fails, or a gateway does not route its messages.

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. Save scan results and freeze-frame data, and check whether the fault is current and whether other modules also report loss of communication with the Active Vibration Control Module.
2. Check battery and charging voltage, then inspect the module’s fuses, power feed, and grounds using vehicle wiring information.
3. Inspect the module connector and nearby network wiring for corrosion, water, loose pins, chafing, or damage.
4. Check with a scan tool whether the Active Vibration Control Module responds and whether the gateway lists or routes its messages.
5. If power and ground are correct, test the relevant CAN network and termination to the manufacturer’s procedure and specification before condemning the module.

Common fixes

• Restore battery or charging-system voltage if low voltage caused the communication loss.
• Repair a fuse, ground, power-feed, or connector fault at the Active Vibration Control Module.
• Repair damaged CAN wiring or a poor network connection.
• Correct a gateway routing or configuration fault if identified by network diagnosis.
• Replace the Active Vibration Control Module only after confirming its power, ground, and network are sound.

Can I keep driving?

If the vehicle drives normally and no hybrid-system warning calls for stopping, limit driving and avoid hard acceleration until the vibration-control fault is checked. Stop if hybrid warnings, unusual drivetrain vibration, or reduced-power behavior appears, because the affected system may no longer control vibration as intended.