WOMS
C code chassis High severity

C1274 Solenoid Relay # 1 Circuit Failure

The OBD2 code C1274 indicates a failure in the circuit of Solenoid Relay #1, which typically affects the operation of the vehicle's transmission or traction control system

Definition

The OBD2 code C1274 indicates a failure in the circuit of Solenoid Relay #1, which typically affects the operation of the vehicle's transmission or traction control system

Common causes

  • Faulty solenoid relay
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Failed control module
  • Faulty solenoid
  • Blown fuse
  • Grounding issues

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Defective solenoid
  • Wiring issues or shorts in the harness
  • Bad ground connections
  • Transmission fluid issues (low or contaminated fluid)
  • Faulty connectors or terminals
  • Malfunctioning valve body
  • Incorrectly installed or damaged transmission components

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring and connectors associated with the solenoid relay. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness that connects to the solenoid relay

  4. 4. Test the Solenoid Relay

    Locate the solenoid relay and test it for proper operation. You can do this by

  5. 5. Removing the relay and using a multimeter to check for continuity

  6. 6. Replacing the relay with a known good one to see if the issue persists

  7. 7. Check the Power Supply

    Ensure that the solenoid relay is receiving the correct voltage. Use a multimeter to check for power at the relay terminals when the ignition is on

  8. 8. If there is no power, trace the wiring back to the fuse box and check for blown fuses or damaged wiring

  9. 9. Inspect the Ground Connection

    Check the ground connection for the solenoid relay. A poor ground can cause circuit failures. Ensure that the ground is clean, tight, and free of corrosion

  10. 10. Test the Solenoid

    If the relay and wiring are functioning correctly, the issue may lie with the solenoid itself. Test the solenoid for proper operation according to the manufacturer's specifications

  11. 11. Check for Short Circuits

    Inspect the circuit for any short circuits that may be causing the relay to fail. This can include checking for pinched wires or damaged insulation

  12. 12. Scan for Software Updates

    In some cases, a software update from the manufacturer may resolve issues related to the traction control or stability control system. Check with the dealership for any available updates

  13. 13. Consult the Service Manual

    Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the solenoid relay and associated systems

  14. 14. Seek Professional Help

    If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify the cause of the C1274 code and take appropriate action to resolve the issue