What Does C1902 Mean?
The ride control module has detected an open circuit in the right rear shock actuator control circuit. There is a complete electrical break preventing the module from energizing the RR shock solenoid. The shock will remain in its default damping state, unable to adjust firmness based on driving conditions.
Common Causes
35%
Broken wire in the RR shock actuator harness from road debris impact or fatigue at flex points near the rear suspension arm
30%
Disconnected or backed-out terminal at the shock actuator connector due to vibration and thermal cycling
25%
Open solenoid coil inside the RR shock actuator from thermal stress or manufacturing defect
10%
Corroded terminal contacts creating effectively infinite resistance at connection points
Diagnostic Steps
1
Step 1: Check the RR shock actuator connector for disconnection. Verify the connector is fully seated and the lock tab is engaged.
2
Step 2: Measure solenoid resistance at the actuator connector. An OL reading confirms an internal open in the actuator.
3
Step 3: If the solenoid tests good, measure wire continuity from the actuator connector to the ride control module connector to identify the broken wire.
4
Step 4: Inspect the harness at high-stress points: near the shock tower, along the trailing arm, and at any body pass-through grommets.
5
Step 5: Repair opens with soldered, heat-shrink sealed connections. Secure the harness with new clips to prevent recurrence.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The ride control module has detected an open circuit in the right rear shock actuator control circuit. There is a complete electrical break preventing the module from energizing the RR shock solenoid. The shock will remain in its default damping state, unable to adjust firmness based on driving cond...
The most common cause of C1902 (Ride Control RR Shock Actuator Circuit Open) is: Broken wire in the RR shock actuator harness from road debris impact or fatigue at flex points near the rear suspension arm
Typical repair costs for C1902 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The RR shock defaults to a fixed damping rate, causing asymmetric ride control. The vehicle remains driveable but may exhibit unpredictable handling on rough or uneven surfaces.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1902 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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