Lost Communication With Active Roll Control Module
The U0259 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Active Roll Control Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $600 - $3,000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Vehicle leaning excessively in turns
- Active roll stabilization warning light
- Stiffer than normal ride quality
- Roll control system disabled message
Probable Causes (Ranked by Likelihood)
- Failed active roll bar actuator Very High
- Hydraulic leak in roll control system High
- CAN bus communication fault Moderate
- Roll control pump failure Low
Step-by-Step Diagnostic Procedure
-
Check active roll bar hydraulic fluid level
-
Scan roll control module for codes
-
Test actuator motors
-
Inspect hydraulic lines for leaks
Frequently Asked Questions
Can I drive with U0259?
Short distances only. The vehicle may lean excessively in turns, affecting handling.
What causes U0259?
Usually a failed actuator or hydraulic leak in the roll control system.
How much does U0259 cost to fix?
Between $600 and $3,000 depending on the component.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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