WOMS
P code powertrain High severity

P1746 Pressure Control Solenoid "A" Open Circuit

The OBD2 code P1746 indicates that there is an open circuit in the Pressure Control Solenoid "A," which means the solenoid is not receiving the proper electrical signal or is malfunctioning, potentially affecting...

Definition

The OBD2 code P1746 indicates that there is an open circuit in the Pressure Control Solenoid "A," which means the solenoid is not receiving the proper electrical signal or is malfunctioning, potentially affecting transmission fluid pressure and shifting performance

Common causes

  • Faulty pressure control solenoid "A"
  • Open or shorted wiring harness
  • Poor electrical connections
  • Failed transmission control module (TCM)
  • Blown fuse
  • Low transmission fluid level
  • Contaminated transmission fluid

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty pressure control solenoid
  • Transmission valve body issues
  • Incorrectly diagnosed internal transmission failure
  • Engine control module (ECM) problems
  • Faulty sensors (e.g., throttle position sensor)
  • Low battery voltage or electrical issues
  • Misinterpretation of other transmission codes

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors leading to the Pressure Control Solenoid "A" for any signs of damage, such as fraying, corrosion, or disconnection

  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 Test: Use a multimeter to measure the resistance of the solenoid. Compare the reading to the specifications provided in the vehicle’s service manual. If the resistance is out of range, the solenoid may be faulty

  5. 5. Power and Ground Test

    Check for proper voltage and ground at the solenoid connector while the vehicle is in the appropriate mode (e.g., ignition on, engine running)

  6. 6. Check for Short Circuits

    Inspect the wiring for any signs of short circuits to ground or to other wires. This can cause the solenoid to malfunction

  7. 7. Inspect Transmission Fluid

    Check the transmission fluid level and condition. Low or contaminated fluid can affect solenoid operation. If the fluid is dirty or burnt, consider a transmission fluid change

  8. 8. Test the Transmission Control Module (TCM)

    If the solenoid and wiring are in good condition, the issue may lie with the TCM. Check for proper operation and any software updates that may be needed

  9. 9. Perform a System Reset

    After addressing any issues found, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  10. 10. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and address the cause of the P1746 code