C1873 – OBD-II DTC

OBD-II DTC C1873 – Air Suspension RF Air Spring Solenoid Output Circuit Failure

DTC C1873 meaning

DTC C1873 refers to a fault in the air suspension system, specifically indicating an issue with the Right Front (RF) Air Spring Solenoid Output Circuit. This code is generated when the vehicle’s onboard diagnostic system detects a malfunction in the electrical circuit that controls the air spring solenoid for the right front suspension. The solenoid is responsible for regulating the air pressure in the air spring, which is crucial for maintaining proper ride height and comfort.

DTC C1873 symptoms

Common symptoms associated with DTC C1873 may include:

• Warning lights on the dashboard, such as the air suspension warning light.
• Uneven ride height, particularly on the right front side of the vehicle.
• Stiff or bouncy ride quality due to improper air spring function.
• Increased noise from the suspension system.
• Possible vehicle sagging or leaning to one side.

DTC C1873 causes

Several factors can lead to the triggering of DTC C1873, including:

• Faulty air spring solenoid.
• Wiring issues, such as damaged or corroded wires in the solenoid output circuit.
• Connector problems, including loose or corroded connections.
• Faulty air suspension control module.
• Air leaks in the air spring or associated components.

DTC C1873 seriousness

DTC C1873 is considered a moderate to serious issue. While the vehicle may still be operable, the compromised air suspension can lead to poor handling, increased tire wear, and potential safety hazards. If left unaddressed, it may result in further damage to the suspension system or other related components.

How to diagnose DTC C1873

To diagnose DTC C1873, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1873 code.
2. Inspect the air spring solenoid and its wiring for visible damage or corrosion.
3. Check the electrical connectors for secure connections and signs of wear.
4. Test the solenoid operation using a multimeter to measure resistance and ensure it is within specifications.
5. Examine the air suspension control module for faults or error codes.
6. Perform a visual inspection of the air spring for leaks or damage.

How to fix DTC C1873 step-by-step instructions

To fix DTC C1873, follow these steps:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. If the air spring solenoid is faulty, replace it with a new one.
3. Ensure all connections are secure and free from corrosion.
4. Check for and repair any air leaks in the air spring or associated components.
5. Clear the DTC using an OBD-II scanner and perform a test drive to verify the repair.
6. Re-scan the system to ensure the code does not return.

How to erase DTC C1873

To erase DTC C1873, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position 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.

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