What Does C1903 Mean?
The ride control module has detected a short-to-battery condition in the right rear shock actuator circuit. A voltage source is feeding into the actuator control wire, causing uncontrolled energization of the solenoid. This can force the shock into a fixed damping mode (typically the softest setting) and may damage the module's output driver over time.
Common Causes
40%
Chafed actuator control wire contacting a 12V power feed in the rear harness
25%
Internal solenoid fault with coil winding shorted to the power input terminal
25%
Contaminated connector with moisture or debris bridging signal to power pins
10%
Module internal output driver failure on the RR actuator channel
Diagnostic Steps
1
Step 1: Disconnect the RR shock actuator and measure voltage on the control wire at the harness side (key on). Voltage present with actuator disconnected confirms a wiring short.
2
Step 2: Check resistance from the control wire to B+ and to other power wires in the harness bundle to identify the short source.
3
Step 3: Inspect the harness for chafing, particularly near the rear shock tower, wheel well, and any areas where aftermarket accessories may have been installed.
4
Step 4: Examine the connector for corrosion or contamination bridging pins.
5
Step 5: After repair, verify the module can properly command the actuator through all damping modes using bidirectional controls.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
The ride control module has detected a short-to-battery condition in the right rear shock actuator circuit. A voltage source is feeding into the actuator control wire, causing uncontrolled energization of the solenoid. This can force the shock into a fixed damping mode (typically the softest setting...
The most common cause of C1903 (Ride Control RR Shock Actuator Circuit Short To Battery) is: Chafed actuator control wire contacting a 12V power feed in the rear harness
Typical repair costs for C1903 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A constantly energized shock actuator locks the damping in one mode, causing inconsistent ride quality and potentially degraded handling during cornering and braking at that corner.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1903 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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