What Does U0133 Mean?
The Engine Control Module (ECM) or Body Control Module (BCM) has lost communication with the Active Roll Control Module on the vehicle's CAN network. This module manages active suspension stabilization during cornering to reduce body roll.
Common Causes
35%
Active Roll Control Module internal failure or power supply issue
30%
Damaged or corroded wiring harness between modules
20%
CAN bus network termination or short circuit fault
10%
Ground connection fault at module or chassis
5%
ECM or BCM communication circuit malfunction
Diagnostic Steps
1
Step 1: Verify power and ground at Active Roll Control Module using multimeter
2
Step 2: Inspect module connector for corrosion, bent pins, or moisture damage
3
Step 3: Check CAN bus voltage levels (should be 2.5V at rest, oscillating 2.0-3.0V during communication)
4
Step 4: Test continuity and resistance of CAN High and CAN Low circuits between modules
5
Step 5: Monitor live data to verify if other modules on same CAN network are communicating properly
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The Engine Control Module (ECM) or Body Control Module (BCM) has lost communication with the Active Roll Control Module on the vehicle's CAN network. This module manages active suspension stabilization during cornering to reduce body roll.
The most common cause of U0133 (Lost Communication With Active Roll Control Module) is: Active Roll Control Module internal failure or power supply issue
Typical repair costs for U0133 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will lose active roll control function, resulting in increased body roll during cornering. Handling characteristics will be compromised, especially during emergency maneuvers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0133 to identify the root cause.
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Quick Info
Category
Network
System
Active Suspension/Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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