DTC Code C1903 – What does this code mean?

<ul> <li><a href="/problems/abs-light-is-on"><b>Anti-Lock Brake System (ABS) Warning Light ON</b></a>: The ABS warning light illuminates on the dashboard, indicating a potential issue with the ride control system. This symptom is linked to a short circuit in the right rear shock actuator, which may affect the vehicle's stability and braking performance.</li> <li><a href="/problems/engine-warning-light-on"><b>Engine Light ON</b></a>: The engine light or service engine soon warning light is activated, suggesting an electrical fault in the ride control system. This symptom is associated with a short to battery in the right rear shock actuator circuit, potentially impacting the vehicle's ride comfort and handling.</li> </ul>

<ul><li>The right rear shock actuator may be faulty, causing a short circuit to the battery.</li><li>An open or shorted harness in the right rear shock actuator can lead to this error code.</li><li>Poor electrical connections in the shock actuator circuit can result in improper functioning.</li><li>A malfunctioning air suspension module might contribute to this issue.</li></ul>

<ul> <li><b>Initial Inspection</b>: Inspect the right rear shock actuator wiring and connectors for any visible damage or corrosion. Ensure all connections are secure.</li> <li><b>Check for Short to Battery</b>: Using a multimeter, check for continuity between the shock actuator circuit and the battery. A short will show continuity where there should be none.</li> <li><b>Inspect Shock Actuator</b>: Disconnect the shock actuator and inspect it for any signs of internal shorting or damage. Replace if necessary.</li> <li><b>Test Control Module</b>: Verify the control module's output to the shock actuator. Ensure it is not sending constant voltage, which could indicate a module fault.</li> <li><b>Check Ground Connections</b>: Ensure all ground connections related to the ride control system are clean and secure to prevent false readings.</li> <li><b>Perform System Reset</b>: After repairs, clear the DTC and perform a system reset. Test drive the vehicle to ensure the issue does not reoccur.</li></ul>

<p>The DTC C1903 indicates a <b>critical</b> issue with the ride control system, specifically a short circuit in the right rear shock actuator. This can lead to <ul><li>compromised vehicle stability</li><li>increased risk of accidents</li><li>potential damage to the suspension system</li></ul>. Immediate attention is required to prevent further complications and ensure safe vehicle operation.</p>