P0732: Gear 2 Incorrect ratio

Definition

The OBD2 code P0732 indicates that the transmission control module has detected an incorrect gear ratio in second gear, suggesting a potential issue with the transmission's performance or components

Common causes

Low transmission fluid level
Faulty transmission fluid pump
Worn or damaged transmission components
Malfunctioning valve body
Defective transmission control module (TCM)
Faulty input or output speed sensors
Transmission solenoid issues
Incorrectly installed or damaged transmission filter
Electrical issues or wiring problems
Software issues in the TCM

Common misdiagnoses

Transmission fluid issues
Faulty transmission control module (TCM)
Worn or damaged transmission components
Incorrectly installed or malfunctioning valve body
Faulty speed sensors
Electrical issues or wiring problems
Engine control module (ECM) problems
Torque converter issues
Clutch problems in automatic transmissions
Incorrect gear ratio due to tire size changes

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide additional context and help narrow down 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 Transmission Wiring and Connectors
6. Inspect the wiring harness and connectors related to the transmission for any signs of damage, corrosion, or loose connections
7. Ensure that all electrical connections are secure
8. Test the Transmission Range Sensor (Neutral Safety Switch)
9. The transmission range sensor tells the TCM what gear the transmission is in. If it is malfunctioning, it can lead to incorrect gear ratio readings
10. Test the sensor for proper operation and replace it if necessary
11. Check the Vehicle Speed Sensor (VSS)
12. The VSS provides information about the vehicle's speed to the TCM. A faulty VSS can cause incorrect shifting and gear ratio errors
13. Test the VSS for proper operation and replace it if needed
14. Inspect the Transmission Control Module (TCM)
15. Check for any software updates or reprogramming that may be required for the TCM
16. If the TCM is suspected to be faulty, it may need to be tested or replaced
17. Perform a Visual Inspection of the Transmission
18. Look for any signs of leaks, damage, or wear in the transmission itself
19. Check for any mechanical issues, such as worn clutches or bands
20. Test Drive the Vehicle
21. After performing the above checks, take the vehicle for a test drive to see if the code returns and to observe the transmission's behavior during shifting
22. Consult a Professional
23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair
24. Clear the Code
25. After addressing any issues, clear the trouble code using the OBD-II scanner and monitor the vehicle to see if the code reappears. By following these troubleshooting steps, you can identify and potentially resolve the issue causing the P0732 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 Transmission Wiring and Connectors

6. Inspect the wiring harness and connectors related to the transmission for any signs of damage, corrosion, or loose connections

7. Ensure that all electrical connections are secure

8. Test the Transmission Range Sensor (Neutral Safety Switch)

9. The transmission range sensor tells the TCM what gear the transmission is in. If it is malfunctioning, it can lead to incorrect gear ratio readings

10. Test the sensor for proper operation and replace it if necessary

11. Check the Vehicle Speed Sensor (VSS)

12. The VSS provides information about the vehicle's speed to the TCM. A faulty VSS can cause incorrect shifting and gear ratio errors

13. Test the VSS for proper operation and replace it if needed

14. Inspect the Transmission Control Module (TCM)

15. Check for any software updates or reprogramming that may be required for the TCM

16. If the TCM is suspected to be faulty, it may need to be tested or replaced

17. Perform a Visual Inspection of the Transmission

18. Look for any signs of leaks, damage, or wear in the transmission itself

19. Check for any mechanical issues, such as worn clutches or bands

20. Test Drive the Vehicle

21. After performing the above checks, take the vehicle for a test drive to see if the code returns and to observe the transmission's behavior during shifting

22. Consult a Professional

23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair

24. Clear the Code

25. After addressing any issues, clear the trouble code using the OBD-II scanner and monitor the vehicle to see if the code reappears. By following these troubleshooting steps, you can identify and potentially resolve the issue causing the P0732 code