What Does C1906 Mean?
The ride control module has detected an open circuit in the left rear shock actuator control circuit. A break in wiring or connector prevents the module from energizing the LR damper solenoid, locking the shock in its default damping state.
Common Causes
35%
Severed wire in the LR shock actuator harness from road debris or fatigue at suspension flex points
30%
Disconnected or loose terminal at the actuator or module connector from vibration
25%
Internal open solenoid coil in the LR shock actuator
10%
Corroded terminal contacts at connection points
Diagnostic Steps
1
Step 1: Verify the LR shock actuator connector is seated and locked. Check for physical disconnection.
2
Step 2: Measure actuator solenoid resistance. An OL reading confirms internal failure.
3
Step 3: Test continuity on each wire from actuator connector to module connector.
4
Step 4: Inspect harness at high-stress areas: near the shock tower, along suspension arms, and at body pass-throughs.
5
Step 5: Repair with weatherproof connections and proper harness routing to prevent repeat failure.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The ride control module has detected an open circuit in the left rear shock actuator control circuit. A break in wiring or connector prevents the module from energizing the LR damper solenoid, locking the shock in its default damping state.
The most common cause of C1906 (Ride Control LR Shock Actuator Circuit Open) is: Severed wire in the LR shock actuator harness from road debris or fatigue at suspension flex points
Typical repair costs for C1906 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The LR shock operates in a fixed damping mode, causing uneven ride control at the rear. Handling may be slightly unpredictable, particularly on rough road surfaces.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1906 to identify the root cause.
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Quick Info
Category
Chassis
System
Electronic Ride Control / Adaptive Suspension
Difficulty
Type
Manufacturer
Recommended Tools
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