P0759: Shift Solenoid B Intermittent

Definition

The OBD2 code P0759 indicates a malfunction or intermittent issue with Shift Solenoid B in the transmission, affecting its ability to control gear shifting properly

Common causes

Faulty shift solenoid B
Wiring issues or damaged connectors
Low transmission fluid level
Contaminated transmission fluid
Faulty transmission control module (TCM)
Internal transmission problems
Poor electrical connections
Faulty vehicle speed sensor (VSS)
Malfunctioning transmission range sensor

Common misdiagnoses

Transmission fluid issues
Faulty transmission control module (TCM)
Wiring or connector problems
Shift solenoid A failure
Valve body issues
Torque converter problems
Internal transmission damage
Engine control module (ECM) issues

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 about the issue
2. Inspect Transmission Fluid
3. Check the transmission fluid level and condition. Low or dirty fluid can cause shifting issues
4. If the fluid is dark, burnt, or has a burnt smell, it may need to be changed
5. Examine Wiring and Connectors
6. Inspect the wiring and connectors leading to the shift solenoid B for any signs of damage, corrosion, or loose connections
7. Repair or replace any damaged wiring or connectors
8. Test the Shift Solenoid
9. Use a multimeter to test the resistance of the shift solenoid B. Compare the readings to the specifications in the vehicle’s service manual
10. If the solenoid is out of spec, it may need to be replaced
11. Check for Mechanical Issues
12. Inspect the transmission for any mechanical issues that could affect the operation of the solenoid, such as sticking valves or internal wear
13. A transmission fluid pressure test may be necessary to check for proper operation
14. Clear Codes and Test Drive
15. After performing any repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
16. Check for Software Updates
17. In some cases, a software update for the vehicle’s engine control module (ECM) or transmission control module (TCM) may be available that addresses known issues with solenoid operation
18. Consult a Professional
19. If the issue persists after performing the above steps, it may be best to consult a professional mechanic or transmission specialist for further diagnosis. By following these steps, you can systematically identify and address the cause of the P0759 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect Transmission Fluid

3. Check the transmission fluid level and condition. Low or dirty fluid can cause shifting issues

4. If the fluid is dark, burnt, or has a burnt smell, it may need to be changed

5. Examine Wiring and Connectors

6. Inspect the wiring and connectors leading to the shift solenoid B for any signs of damage, corrosion, or loose connections

7. Repair or replace any damaged wiring or connectors

8. Test the Shift Solenoid

9. Use a multimeter to test the resistance of the shift solenoid B. Compare the readings to the specifications in the vehicle’s service manual

10. If the solenoid is out of spec, it may need to be replaced

11. Check for Mechanical Issues

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

13. A transmission fluid pressure test may be necessary to check for proper operation

14. Clear Codes and Test Drive

15. After performing any repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

16. Check for Software Updates

17. In some cases, a software update for the vehicle’s engine control module (ECM) or transmission control module (TCM) may be available that addresses known issues with solenoid operation

18. Consult a Professional

19. If the issue persists after performing the above steps, it may be best to consult a professional mechanic or transmission specialist for further diagnosis. By following these steps, you can systematically identify and address the cause of the P0759 code