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P0970 Pressure Control Solenoid "C" Control Circuit Low

The OBD2 code P0970 indicates a low voltage or malfunction in the control circuit for the pressure control solenoid "C" in the transmission system, which can affect shifting and overall transmission performance

Definition

The OBD2 code P0970 indicates a low voltage or malfunction in the control circuit for the pressure control solenoid "C" in the transmission system, which can affect shifting and overall transmission performance

Common causes

  • Faulty pressure control solenoid "C"
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Faulty transmission control module (TCM)
  • Low transmission fluid level
  • Contaminated transmission fluid
  • Internal transmission failure

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty pressure control solenoid
  • Transmission valve body issues
  • Incorrectly diagnosed transmission failure
  • Engine control module (ECM) issues
  • Other solenoid malfunctions

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 "C". Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that the connectors are securely attached and that there are no broken wires

  5. 5. Test the Solenoid

  6. 6. If accessible, test the solenoid itself for proper operation. You can do this by applying direct battery voltage to the solenoid and checking if it activates

  7. 7. Measure the resistance of the solenoid using a multimeter. Compare the reading 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. You should see battery voltage when the solenoid is commanded on

  10. 10. Check for a good ground connection at the solenoid. A poor ground can cause low voltage readings

  11. 11. Inspect the Transmission Fluid

  12. 12. Low or dirty transmission fluid can affect solenoid operation. Check the fluid level and condition, and replace it if necessary

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

  14. 14. The TCM controls the solenoid operation. If the TCM is malfunctioning, it may not send the correct signals to the solenoid. Check for any software updates or known issues with the TCM for your specific vehicle model

  15. 15. Check for Short Circuits

  16. 16. Inspect the wiring harness for any signs of short circuits or grounding issues that could affect the solenoid circuit

  17. 17. Perform a Visual Inspection of the Transmission

  18. 18. Look for any signs of leaks or damage to the transmission that could affect solenoid operation

  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. Refer to the vehicle's service manual for specific diagnostic procedures, wiring diagrams, and specifications related to the Pressure Control Solenoid "C". If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis and repair