WOMS
C code chassis Medium severity

C1902 Ride Control RR Shock Actuator Circuit Open

The OBD2 code C1902 indicates that there is an open circuit in the rear right shock actuator of the ride control system, meaning the actuator is not receiving power or is not functioning properly

Definition

The OBD2 code C1902 indicates that there is an open circuit in the rear right shock actuator of the ride control system, meaning the actuator is not receiving power or is not functioning properly

Common causes

  • Faulty rear right shock actuator
  • Open circuit or wiring issues
  • Poor electrical connections
  • Damaged or corroded connectors
  • Failed control module
  • Blown fuse related to the ride control system
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty shock absorber
  • Bad wiring or connectors
  • Defective ride control module
  • Incorrectly calibrated suspension system
  • Malfunctioning body control module (BCM)
  • Issues with the power supply to the actuator
  • Faulty sensors related to suspension
  • Software or programming errors in the vehicle's control systems

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the ride control system and the C1902 code. This can provide valuable insights into the circuit layout and components involved

  2. 2. Visual Inspection

  3. 3. Inspect the wiring harness and connectors associated with the rear right shock actuator. Look for any signs of damage, such as frayed wires, corrosion, or loose connections

  4. 4. Ensure that the connectors are securely attached and free of dirt or debris

  5. 5. Test the Shock Actuator

  6. 6. Use a multimeter to check the resistance of the shock actuator. Compare the readings to the specifications provided in the service manual

  7. 7. If the actuator is out of specification, it may need to be replaced

  8. 8. Check for Power and Ground

  9. 9. With the ignition on, use a multimeter to check for voltage at the actuator connector. You should see the specified voltage (usually around 12V)

  10. 10. Also, check for a good ground connection. If there is no power or ground, trace the wiring back to the control module

  11. 11. Inspect the Control Module

  12. 12. If the actuator and wiring appear to be in good condition, the issue may lie with the control module. Check for any fault codes related to the control module itself

  13. 13. If necessary, perform a reset of the control module or reprogram it according to the manufacturer's instructions

  14. 14. Scan for Additional Codes

  15. 15. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  16. 16. Perform a Continuity Test

  17. 17. With the vehicle off, perform a continuity test on the wiring between the control module and the shock actuator. This will help identify any breaks in the circuit

  18. 18. Check for Short Circuits

  19. 19. Inspect the wiring for any signs of short circuits that could cause the circuit to open. This includes checking for pinched wires or contact with metal surfaces

  20. 20. Consult Technical Service Bulletins (TSBs)

  21. 21. Look for any TSBs related to the ride control system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  22. 22. Professional Diagnosis

  23. 23. If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose and repair the problem effectively. By following these troubleshooting steps, you should be able to identify the cause of the C1902 code and take appropriate action to resolve the issue