C1906 – OBD-II DTC

OBD-II DTC C1906 – Ride Control LR Shock Actuator Circuit Open

DTC C1906 meaning

DTC C1906 refers to a diagnostic trouble code indicating an open circuit in the ride control left rear (LR) shock actuator. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components to ensure proper functionality. The ride control system is responsible for adjusting the suspension settings to enhance ride quality and handling. An open circuit means that there is a break in the electrical connection, preventing the actuator from receiving the necessary signals to operate correctly.

DTC C1906 symptoms

Common symptoms associated with DTC C1906 may include:

• Warning lights on the dashboard, such as the check engine light or suspension warning light.
• Reduced ride quality or handling performance.
• Inconsistent or unresponsive suspension adjustments.
• Possible noise from the suspension system when driving over bumps.

DTC C1906 causes

Several factors can lead to the occurrence of DTC C1906, including:

• Damaged or frayed wiring in the shock actuator circuit.
• Corroded or loose electrical connectors.
• Faulty shock actuator itself.
• Issues with the vehicle’s body control module (BCM) or suspension control module.

DTC C1906 seriousness

DTC C1906 is considered a moderate to serious issue. While the vehicle may still be operable, the compromised ride control system can lead to poor handling and increased wear on suspension components. Ignoring this code can result in further damage to the suspension system and may affect overall vehicle safety and performance.

How to diagnose DTC C1906

To diagnose DTC C1906, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1906 code.
2. Inspect the wiring and connectors associated with the left rear shock actuator for any visible damage or corrosion.
3. Perform a continuity test on the actuator circuit to check for any breaks.
4. Test the shock actuator for proper operation using a multimeter.
5. Check the vehicle’s body control module and suspension control module for any fault codes or issues.

How to fix DTC C1906 step-by-step instructions

To fix DTC C1906, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and repair any damaged wiring or connectors in the shock actuator circuit.
3. If the shock actuator is faulty, replace it with a new or refurbished unit.
4. Reconnect all electrical connections securely and ensure there are no loose wires.
5. Reconnect the vehicle’s battery.
6. Clear the DTC using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.

How to erase DTC C1906

To erase DTC C1906, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the option to read or clear trouble codes on the scanner.
4. Select the option to erase or clear the DTCs.
5. Confirm the action and wait for the scanner to indicate that the codes have been cleared.
6. Disconnect the scanner and start the vehicle to ensure the warning lights do not reappear.