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P0964 Pressure Control Solenoid "B" Control Circuit/Open

The OBD2 code P0964 indicates a problem with the pressure control solenoid "B" in the transmission, specifically that there is an open circuit or a malfunction in the control circuit for that solenoid

Definition

The OBD2 code P0964 indicates a problem with the pressure control solenoid "B" in the transmission, specifically that there is an open circuit or a malfunction in the control circuit for that solenoid

Common causes

  • Faulty pressure control solenoid "B"
  • Open or shorted wiring in the control circuit
  • Poor electrical connections or corroded connectors
  • Failed transmission control module (TCM)
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Faulty transmission valve body

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty pressure control solenoid
  • Transmission valve body issues
  • Low transmission fluid level
  • Internal transmission failure
  • Electrical shorts or opens in the circuit

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

  3. 3. Visually inspect the wiring and connectors associated with the Pressure Control Solenoid "B". Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that the wiring harness is not pinched, frayed, or shorted to ground

  5. 5. Test the Solenoid

  6. 6. If accessible, test the Pressure Control Solenoid "B" for proper operation. This may involve measuring resistance with a multimeter or applying voltage to see if it activates

  7. 7. Compare the readings to the manufacturer's specifications

  8. 8. Check Power and Ground

  9. 9. Use a multimeter to check for proper voltage at the solenoid connector when the ignition is on and the engine is running

  10. 10. Ensure that the solenoid has a good ground connection

  11. 11. Inspect the Transmission Fluid

  12. 12. Check the transmission fluid level and condition. Low or dirty fluid can affect solenoid operation

  13. 13. If the fluid is contaminated, consider performing a transmission fluid change

  14. 14. Scan for Transmission Issues

  15. 15. If the vehicle has a transmission control module (TCM), check for any faults or issues within the TCM that could affect solenoid operation

  16. 16. Look for any signs of transmission slipping or other performance issues

  17. 17. Perform a Visual Inspection of the Transmission

  18. 18. Inspect the transmission for any signs of leaks or damage that could affect solenoid performance

  19. 19. Clear Codes and Test Drive

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

  21. 21. Consult Technical Service Bulletins (TSBs)

  22. 22. Check for any TSBs related to the P0964 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  23. 23. Seek Professional Help

  24. 24. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission systems and can perform more advanced diagnostics. By following these steps, you can systematically identify and address the underlying cause of the P0964 code