U0133: Lost Communication With Active Roll Control Module

What it means

A control module has stopped receiving expected messages from the active roll control module. Active roll-control functions may be limited or unavailable.

At a glance

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

How it works

The Active Roll Control Module operates or coordinates the system that limits body roll and shares status with other controllers over the vehicle network. This code sets when expected messages from that module are not received, so active roll-control assistance may be unavailable.

Common causes

Most likely first.

1. Active roll control module power or ground fault
2. Damaged network wiring or connector
3. Active roll control module failure
4. Low system voltage

Symptoms

• Chassis or suspension warning
• Active roll-control function may be unavailable
• Other communication codes

How to diagnose it

1. Save freeze-frame data and scan all modules for chassis, suspension, and communication faults; check whether the Active Roll Control Module alone is offline.
2. Check battery and charging-system condition, then verify the module’s fuses, power feed, and grounds using the wiring diagram.
3. Inspect the Active Roll Control Module connector and network wiring for water, corrosion, loose pins, or physical damage.
4. Check scan-tool communication and gateway status for messages from the Active Roll Control Module.
5. If power and ground are present, test the network circuit and termination according to the manufacturer’s procedure and specification.

Common fixes

• Correct a weak battery or charging-system fault if it is affecting module voltage.
• Repair a blown fuse, poor ground, or interrupted power feed to the Active Roll Control Module.
• Repair a damaged connector or network wire and clear the communication fault after repair.
• Correct a verified gateway routing or configuration problem.
• Replace the Active Roll Control Module only after confirming its power, ground, and network connection.

Can I keep driving?

The vehicle may have less resistance to body roll during cornering, so reduce speed and avoid abrupt turns until the fault is checked. Stop if handling feels unstable or a chassis warning indicates a related safety function is unavailable.