P0814: Transmission Range Display Circuit

Definition

The OBD2 code P0814 indicates a malfunction in the transmission range display circuit, which affects the proper functioning of the transmission range sensor or switch, leading to incorrect gear position readings

Common causes

Faulty transmission range sensor
Wiring issues or damaged connectors
Malfunctioning transmission control module (TCM)
Low transmission fluid levels
Faulty gear shift lever or linkage
Corroded or loose electrical connections
Software issues in the vehicle's computer system

Common misdiagnoses

Faulty transmission control module (TCM)
Incorrectly diagnosed transmission issues
Faulty neutral safety switch
Wiring or connector issues
Malfunctioning gear selector
Faulty engine control module (ECM)
Incorrectly diagnosed electrical problems

Troubleshooting steps

1. Check for Additional Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue
2. Inspect the Transmission Range Sensor
3. Locate the transmission range sensor (also known as the neutral safety switch or gear position sensor) and visually inspect it for any signs of damage, corrosion, or loose connections
4. Ensure that the sensor is properly mounted and aligned
5. Check Wiring and Connectors
6. Inspect the wiring harness and connectors associated with the transmission range sensor for any signs of wear, fraying, or damage
7. Ensure that all connectors are securely attached and free of corrosion
8. Test the Transmission Range Sensor
9. Use a multimeter to test the resistance and voltage output of the transmission range sensor according to the manufacturer's specifications
10. Check for continuity in the wiring between the sensor and the engine control module (ECM)
11. Inspect the Transmission Fluid Level
12. Low or dirty transmission fluid can affect the operation of the transmission range sensor. Check the fluid level and condition, and change it if necessary
13. Check for Mechanical Issues
14. Ensure that the transmission is functioning properly and that there are no mechanical issues that could affect the sensor's operation
15. Clear the Codes and Test Drive
16. After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
17. Consult Technical Service Bulletins (TSBs)
18. Check for any TSBs related to the P0814 code for your specific vehicle make and model. Manufacturers may have issued guidance or fixes for known issues
19. Seek Professional Help
20. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission issues. By following these troubleshooting steps, you can identify and potentially resolve the issue related to the P0814 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the Transmission Range Sensor

3. Locate the transmission range sensor (also known as the neutral safety switch or gear position sensor) and visually inspect it for any signs of damage, corrosion, or loose connections

4. Ensure that the sensor is properly mounted and aligned

5. Check Wiring and Connectors

6. Inspect the wiring harness and connectors associated with the transmission range sensor for any signs of wear, fraying, or damage

7. Ensure that all connectors are securely attached and free of corrosion

8. Test the Transmission Range Sensor

9. Use a multimeter to test the resistance and voltage output of the transmission range sensor according to the manufacturer's specifications

10. Check for continuity in the wiring between the sensor and the engine control module (ECM)

11. Inspect the Transmission Fluid Level

12. Low or dirty transmission fluid can affect the operation of the transmission range sensor. Check the fluid level and condition, and change it if necessary

13. Check for Mechanical Issues

14. Ensure that the transmission is functioning properly and that there are no mechanical issues that could affect the sensor's operation

15. Clear the Codes and Test Drive

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

17. Consult Technical Service Bulletins (TSBs)

18. Check for any TSBs related to the P0814 code for your specific vehicle make and model. Manufacturers may have issued guidance or fixes for known issues

19. Seek Professional Help

20. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with transmission issues. By following these troubleshooting steps, you can identify and potentially resolve the issue related to the P0814 code