WOMS
P code powertrain High severity

P1905 Pressure Control Solenoid "C" Intermittent Short

The OBD2 code P1905 indicates an intermittent short circuit in the Pressure Control Solenoid "C," which affects the transmission's ability to regulate pressure properly

Definition

The OBD2 code P1905 indicates an intermittent short circuit in the Pressure Control Solenoid "C," which affects the transmission's ability to regulate pressure properly

Common causes

  • Faulty pressure control solenoid "C"
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit in the wiring harness
  • Faulty transmission control module (TCM)
  • Low transmission fluid levels
  • Contaminated transmission fluid
  • Internal transmission issues

Common misdiagnoses

  • Faulty Transmission Control Module (TCM)
  • Wiring issues or shorts in the harness
  • Faulty Pressure Control Solenoid "A" or "B"
  • Low transmission fluid level or quality
  • Transmission fluid pump issues
  • Internal transmission failure
  • Faulty connectors or terminals
  • Engine control module (ECM) issues
  • Incorrectly diagnosed sensor failures
  • Mechanical issues within the transmission

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the Pressure Control Solenoid "C" for any signs of damage, such as fraying, corrosion, or loose connections

  3. 3. Connector Condition

    Ensure that the connectors are securely attached and free of dirt or moisture

  4. 4. Test the Pressure Control Solenoid

    Resistance Check: Use a multimeter to measure the resistance of the solenoid. Compare the reading to the manufacturer’s specifications. If it’s out of range, the solenoid may be faulty

  5. 5. Functionality Test

    If possible, test the solenoid by applying power directly to it to see if it operates correctly

  6. 6. Check for Short Circuits

    Wiring Inspection: Look for any signs of short circuits in the wiring. This can include wires that are pinched, frayed, or touching other metal components

  7. 7. Continuity Test

    Perform a continuity test on the wiring to ensure there are no breaks or shorts in the circuit

  8. 8. Inspect the Transmission Fluid

    Fluid Condition: Check the transmission fluid for contamination or burning, which can affect solenoid operation

  9. 9. Fluid Level

    Ensure that the transmission fluid is at the correct level, as low fluid can cause erratic behavior

  10. 10. Check the Transmission Control Module (TCM)

    TCM Functionality: If the solenoid and wiring are in good condition, the issue may lie with the TCM. Check for software updates or faults in the TCM

  11. 11. Reprogramming

    In some cases, reprogramming or resetting the TCM may resolve the issue

  12. 12. Perform a Road Test

    After addressing any issues found, clear the codes and take the vehicle for a test drive to see if the code returns. Monitor the transmission performance during the drive

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the P1905 code

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission issues and OBD-II diagnostics. By following these steps, you can systematically diagnose and address the cause of the P1905 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your particular model