WOMS
C code chassis Medium severity

C1933 Solenoid Current Out Of Range

The OBD2 code C1933 indicates that the solenoid current is outside the expected range, which may suggest a malfunction in the solenoid or related circuitry in the vehicle's transmission or control system

Definition

The OBD2 code C1933 indicates that the solenoid current is outside the expected range, which may suggest a malfunction in the solenoid or related circuitry in the vehicle's transmission or control system

Common causes

  • Faulty solenoid
  • Wiring issues (shorts or opens)
  • Poor electrical connections
  • Failed transmission control module (TCM)
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Internal transmission failure

Common misdiagnoses

  • Faulty transmission control module (TCM)
  • Wiring issues or shorts in the harness
  • Defective solenoid
  • Low transmission fluid level
  • Faulty transmission fluid temperature sensor
  • Incorrectly installed or damaged transmission components
  • Software issues or outdated firmware in the TCM
  • Mechanical transmission problems

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors related to the solenoid. Look for signs of damage, corrosion, or loose connections that could affect the solenoid's operation

  3. 3. Test the Solenoid

    If accessible, test the solenoid itself for proper operation. You can use a multimeter to check the resistance of the solenoid coil. Compare the readings to the specifications in the service manual

  4. 4. Check Power and Ground

    Ensure that the solenoid is receiving the correct voltage and has a good ground connection. Use a multimeter to measure the voltage at the solenoid connector while the vehicle is in operation

  5. 5. Inspect the Transmission Fluid

    Low or contaminated transmission fluid can cause solenoid issues. Check the fluid level and condition, and replace it if necessary

  6. 6. Check for Mechanical Issues

    Inspect the transmission for any mechanical problems that could affect solenoid operation, such as sticking valves or internal wear

  7. 7. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  8. 8. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the C1933 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  9. 9. Professional Diagnosis

    If the problem persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's specific system. By following these steps, you can systematically diagnose and potentially resolve the issue associated with the C1933 code