P0868: Transmission Fluid Pressure Low

Definition

The OBD2 code P0868 indicates that the transmission control module has detected low transmission fluid pressure, which can affect the transmission's performance and operation

Common causes

Low transmission fluid level
Faulty transmission fluid pressure sensor
Clogged transmission filter
Faulty transmission pump
Internal transmission leaks
Wiring issues or damaged connectors
Faulty transmission control module (TCM)
Malfunctioning valve body

Common misdiagnoses

Faulty transmission control module (TCM)
Low transmission fluid level
Transmission fluid contamination
Faulty transmission pump
Wiring or connector issues
Faulty pressure sensor
Internal transmission failure
Engine control module (ECM) issues
Incorrect transmission fluid type
Torque converter problems

Troubleshooting steps

1. Check Transmission Fluid Level
2. Ensure the transmission fluid is at the correct level. Low fluid can cause low pressure
3. If the fluid is low, top it off with the appropriate type of transmission fluid
4. Inspect Transmission Fluid Condition
5. Check the condition of the transmission fluid. It should be a bright red color and should not have a burnt smell
6. If the fluid is dark, dirty, or has a burnt odor, consider changing the fluid and filter
7. Look for Leaks
8. Inspect the transmission and surrounding areas for any signs of fluid leaks. Common leak points include seals, gaskets, and cooler lines
9. Check for Faulty Sensors
10. The transmission fluid pressure sensor may be faulty. Use a multimeter to test the sensor's resistance and compare it to the manufacturer's specifications
11. If the sensor is defective, replace it
12. Inspect Wiring and Connectors
13. Check the wiring and connectors related to the transmission fluid pressure sensor for any signs of damage, corrosion, or loose connections
14. Examine the Transmission Control Module (TCM)
15. The TCM may be malfunctioning. Check for any software updates or reprogramming that may be needed
16. If necessary, perform a reset or reflash of the TCM
17. Check for Other Diagnostic Trouble Codes (DTCs)
18. Scan for any additional codes that may provide more context or indicate related issues
19. Perform a Pressure Test
20. If you have the necessary tools, perform a transmission fluid pressure test to determine if the pressure is indeed low and to identify potential internal issues
21. Inspect for Internal Transmission Issues
22. If all else fails, there may be internal problems within the transmission, such as worn components, a failing pump, or valve body issues. A professional inspection may be required
23. Consult Repair Manual
24. Refer to the vehicle's service manual for specific troubleshooting steps and specifications related to the P0868 code. 1
25. Clear Codes and Test Drive
26. After performing any repairs or maintenance, clear the codes and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists, it is advisable to consult a professional mechanic for further diagnosis and repair

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check Transmission Fluid Level

2. Ensure the transmission fluid is at the correct level. Low fluid can cause low pressure

3. If the fluid is low, top it off with the appropriate type of transmission fluid

4. Inspect Transmission Fluid Condition

5. Check the condition of the transmission fluid. It should be a bright red color and should not have a burnt smell

6. If the fluid is dark, dirty, or has a burnt odor, consider changing the fluid and filter

7. Look for Leaks

8. Inspect the transmission and surrounding areas for any signs of fluid leaks. Common leak points include seals, gaskets, and cooler lines

9. Check for Faulty Sensors

10. The transmission fluid pressure sensor may be faulty. Use a multimeter to test the sensor's resistance and compare it to the manufacturer's specifications

11. If the sensor is defective, replace it

12. Inspect Wiring and Connectors

13. Check the wiring and connectors related to the transmission fluid pressure sensor for any signs of damage, corrosion, or loose connections

14. Examine the Transmission Control Module (TCM)

15. The TCM may be malfunctioning. Check for any software updates or reprogramming that may be needed

16. If necessary, perform a reset or reflash of the TCM

17. Check for Other Diagnostic Trouble Codes (DTCs)

18. Scan for any additional codes that may provide more context or indicate related issues

19. Perform a Pressure Test

20. If you have the necessary tools, perform a transmission fluid pressure test to determine if the pressure is indeed low and to identify potential internal issues

21. Inspect for Internal Transmission Issues

22. If all else fails, there may be internal problems within the transmission, such as worn components, a failing pump, or valve body issues. A professional inspection may be required

23. Consult Repair Manual

24. Refer to the vehicle's service manual for specific troubleshooting steps and specifications related to the P0868 code. 1

25. Clear Codes and Test Drive

26. After performing any repairs or maintenance, clear the codes and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists, it is advisable to consult a professional mechanic for further diagnosis and repair