P0972: Shift Solenoid A Control Circuit Range/Performance

Definition

The OBD2 code P0972 indicates a problem with the shift solenoid A control circuit, specifically that the performance or range of the circuit is outside the expected parameters, which may affect transmission shifting

Common causes

Faulty shift solenoid A
Wiring issues (shorts, opens, or corrosion)
Poor electrical connections
Transmission control module (TCM) malfunction
Low transmission fluid level
Contaminated transmission fluid
Faulty transmission valve body
Internal transmission issues
Faulty PCM (Powertrain Control Module)
Software issues in the TCM or PCM

Common misdiagnoses

Faulty transmission control module (TCM)
Defective shift solenoid
Wiring issues or short circuits
Low transmission fluid level
Transmission fluid contamination
Faulty transmission valve body
Incorrectly installed or damaged transmission components
Engine control module (ECM) issues
Mechanical transmission problems
Faulty connectors or terminals

Troubleshooting steps

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. Inspect Wiring and Connectors
3. Visually inspect the wiring and connectors associated with the Shift Solenoid A. Look for signs of damage, corrosion, or loose connections
4. Ensure that the wiring harness is not pinched or frayed
5. Test the Shift Solenoid
6. Use a multimeter to test the resistance of the Shift Solenoid A. Compare the readings to the specifications provided in the vehicle’s service manual
7. If the solenoid is out of specification, it may need to be replaced
8. Check Transmission Fluid
9. Inspect the transmission fluid level and condition. Low or dirty fluid can affect solenoid operation
10. If the fluid is low, top it off with the correct type of transmission fluid. If it is dirty, consider a transmission fluid change
11. Inspect the Transmission Control Module (TCM)
12. Check for any issues with the TCM, as it controls the operation of the shift solenoids. Ensure that it is functioning properly and that there are no software issues
13. If necessary, reprogram or replace the TCM
14. Test the Circuit
15. Use a multimeter to check the voltage and ground at the solenoid connector while the vehicle is running. Ensure that the solenoid is receiving the correct voltage
16. If there is no voltage, trace the circuit back to the TCM to identify any breaks or shorts
17. Perform a Transmission Fluid Pressure Test
18. If applicable, perform a pressure test to ensure that the transmission is operating within the correct pressure range. Low pressure can affect solenoid performance
19. Check for Mechanical Issues
20. Inspect the transmission for any mechanical issues that could affect the operation of the solenoids, such as sticking valves or internal wear
21. Clear Codes and Test Drive
22. After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns
23. Consult a Professional
24. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis. By following these steps, you can systematically identify and address the underlying cause of the P0972 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Wiring and Connectors

3. Visually inspect the wiring and connectors associated with the Shift Solenoid A. Look for signs of damage, corrosion, or loose connections

4. Ensure that the wiring harness is not pinched or frayed

5. Test the Shift Solenoid

6. Use a multimeter to test the resistance of the Shift Solenoid A. Compare the readings to the specifications provided in the vehicle’s service manual

7. If the solenoid is out of specification, it may need to be replaced

8. Check Transmission Fluid

9. Inspect the transmission fluid level and condition. Low or dirty fluid can affect solenoid operation

10. If the fluid is low, top it off with the correct type of transmission fluid. If it is dirty, consider a transmission fluid change

11. Inspect the Transmission Control Module (TCM)

12. Check for any issues with the TCM, as it controls the operation of the shift solenoids. Ensure that it is functioning properly and that there are no software issues

13. If necessary, reprogram or replace the TCM

14. Test the Circuit

15. Use a multimeter to check the voltage and ground at the solenoid connector while the vehicle is running. Ensure that the solenoid is receiving the correct voltage

16. If there is no voltage, trace the circuit back to the TCM to identify any breaks or shorts

17. Perform a Transmission Fluid Pressure Test

18. If applicable, perform a pressure test to ensure that the transmission is operating within the correct pressure range. Low pressure can affect solenoid performance

19. Check for Mechanical Issues

20. Inspect the transmission for any mechanical issues that could affect the operation of the solenoids, such as sticking valves or internal wear

21. Clear Codes and Test Drive

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

23. Consult a Professional

24. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis. By following these steps, you can systematically identify and address the underlying cause of the P0972 code