C1905 – OBD-II DTC

OBD-II DTC C1905 – Ride Control LR Shock Actuator Circuit Failure

DTC C1905 meaning

DTC C1905 refers to a fault in the Ride Control Left Rear (LR) Shock Actuator Circuit. This diagnostic trouble code indicates that the vehicle’s onboard diagnostic system has detected an issue with the electrical circuit that controls the left rear shock absorber actuator, which is responsible for adjusting the suspension system for optimal ride quality and handling.

DTC C1905 symptoms

Common symptoms associated with DTC C1905 may include:

• Warning lights illuminated on the dashboard, such as the suspension or check engine light.
• Decreased ride quality, leading to a rough or bumpy driving experience.
• Inconsistent handling or stability of the vehicle during turns or braking.
• Unusual noises coming from the suspension system.

DTC C1905 causes

Several factors can lead to the triggering of DTC C1905, including:

• Faulty left rear shock actuator.
• Wiring issues, such as damaged or corroded wires in the actuator circuit.
• Connector problems, including loose or corroded connections.
• Malfunctioning suspension control module.
• Software issues within the vehicle’s control systems.

DTC C1905 seriousness

DTC C1905 is considered a moderate to serious issue. While it may not immediately affect the vehicle’s ability to operate, it can lead to compromised ride quality and handling, which may pose safety risks. Ignoring this code can result in further damage to the suspension system and increased repair costs.

How to diagnose DTC C1905

To diagnose DTC C1905, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC C1905.
2. Inspect the left rear shock actuator and its wiring for visible damage or corrosion.
3. Check the connectors for secure connections and signs of wear.
4. Test the left rear shock actuator for proper operation using a multimeter.
5. Examine the suspension control module for any fault codes or software issues.
6. Clear the DTC and perform a road test to see if the code returns.

How to fix DTC C1905 step-by-step instructions

To fix DTC C1905, follow these steps:

1. Inspect and repair any damaged wiring or connectors related to the left rear shock actuator.
2. If the actuator is faulty, replace it with a new or refurbished unit.
3. Ensure all connections are secure and free from corrosion.
4. Reprogram or update the suspension control module if necessary.
5. Clear the DTC using an OBD-II scanner.
6. Perform a road test to confirm that the issue has been resolved and that the DTC does not return.

How to erase DTC C1905

To erase DTC C1905, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Access the diagnostic menu on the scanner and select the option to clear or erase trouble codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.