WOMS
P code powertrain High severity

P0746 Pressure Control Solenoid A Performance or Stuck Off

The OBD2 code P0746 indicates a problem with the pressure control solenoid A in the transmission, either due to performance issues or it being stuck in the off position, which can affect transmission fluid pressure and...

Definition

The OBD2 code P0746 indicates a problem with the pressure control solenoid A in the transmission, either due to performance issues or it being stuck in the off position, which can affect transmission fluid pressure and shifting

Common causes

  • Faulty pressure control solenoid A
  • Wiring issues or damaged connectors
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission control module (TCM)
  • Internal transmission problems
  • Faulty valve body
  • Electrical issues in the solenoid circuit

Common misdiagnoses

  • Transmission fluid issues (low or dirty fluid)
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty pressure control solenoid
  • Internal transmission damage
  • Torque converter issues
  • Incorrect transmission fluid type
  • Engine control module (ECM) 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. This can provide more context and help identify related issues

  2. 2. Inspect Transmission Fluid

    Fluid Level: Check the transmission fluid level. Low fluid can cause various transmission issues

  3. 3. Fluid Condition

    Inspect the fluid for contamination, burning smell, or discoloration. If the fluid is dirty or burnt, consider a transmission fluid change

  4. 4. Examine Wiring and Connectors

    Inspect the wiring and connectors leading to the pressure control solenoid. Look for signs of damage, corrosion, or loose connections that could affect the solenoid's operation

  5. 5. Test the Pressure Control Solenoid

    Use a multimeter to test the resistance of the pressure control solenoid. Compare the readings to the specifications in the vehicle's service manual

  6. 6. If possible, perform a functional test of the solenoid to see if it operates correctly when commanded

  7. 7. Check for Mechanical Issues

    Inspect the transmission for any mechanical issues that could affect the solenoid's performance, such as sticking valves or internal wear

  8. 8. Scan for Transmission Data

    Use a scan tool to monitor live data from the transmission control module (TCM). Look for any abnormal readings related to pressure, temperature, or solenoid operation

  9. 9. Inspect the Transmission Control Module (TCM)

    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

  10. 10. Perform a Transmission Fluid Flush

    If the fluid is contaminated, a complete transmission fluid flush may help resolve the issue

  11. 11. Clear Codes and Test Drive

    After performing any repairs or maintenance, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  12. 12. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or transmission specialist for further diagnosis and repair.Additional Notes: - Always refer to the vehicle's service manual for specific procedures and specifications. - Safety precautions should be taken when working on the vehicle, especially with the transmission system. By following these troubleshooting steps, you can identify the root cause of the P0746 code and take appropriate action to resolve the issue