U1312: Invalid or Missing Data for Vehicle Speed

Definition

The OBD2 code U1312 indicates that there is invalid or missing data related to the vehicle's speed, which may affect communication between modules in the vehicle's network

Common causes

Faulty vehicle speed sensor
Damaged wiring or connectors
Poor ground connection
Malfunctioning engine control module (ECM)
Issues with the transmission control module (TCM)
Faulty ABS module
Corrupted data communication between modules
Software glitches or updates needed in the ECM/TCM

Common misdiagnoses

Faulty Vehicle Speed Sensor (VSS)
Malfunctioning Engine Control Module (ECM)
Wiring issues or short circuits in the speed sensor circuit
Faulty ABS module
Incorrect tire size or calibration issues
Transmission problems
Issues with the instrument cluster
Faulty or corroded connectors in the speed sensor circuit

Troubleshooting steps

1. Check for Other Codes

Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help in diagnosing the issue more effectively
2. Inspect Wiring and Connectors
3. Check the wiring and connectors related to the vehicle speed sensor (VSS) and the modules that communicate with it. Look for signs of damage, corrosion, or loose connections
4. Pay special attention to the wiring harnesses that connect to the engine control module (ECM) and the transmission control module (TCM)
5. Test the Vehicle Speed Sensor (VSS)
6. Locate the VSS and test its output using a multimeter or oscilloscope. Ensure it is providing the correct voltage and signal
7. If the VSS is faulty, replace it
8. Check the Instrument Cluster
9. If the vehicle has an electronic speedometer, ensure that the instrument cluster is functioning correctly. A malfunctioning cluster can lead to incorrect speed readings
10. Inspect the ABS Module
11. In some vehicles, the ABS module also plays a role in providing vehicle speed data. Check for any issues with the ABS system, including sensors and wiring
12. Scan for Communication Issues
13. Use a scan tool to check for communication errors between modules. Ensure that all modules are communicating properly and that there are no communication faults
14. Check for Software Updates
15. Sometimes, a software update for the vehicle's control modules can resolve communication issues. Check with the manufacturer or a dealership for any available updates
16. Clear Codes and Test Drive
17. After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code reappears
18. Consult Repair Manuals or Technical Service Bulletins (TSBs)
19. Look for any specific repair manuals or TSBs related to your vehicle make and model that may provide additional guidance on troubleshooting U1312
20. Seek Professional Help
21. If the issue persists after performing these steps, consider seeking help from a qualified mechanic or automotive technician who has experience with your vehicle's make and model. By following these steps, you should be able to identify and resolve the underlying issue causing the U1312 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Other Codes

2. Inspect Wiring and Connectors

3. Check the wiring and connectors related to the vehicle speed sensor (VSS) and the modules that communicate with it. Look for signs of damage, corrosion, or loose connections

4. Pay special attention to the wiring harnesses that connect to the engine control module (ECM) and the transmission control module (TCM)

5. Test the Vehicle Speed Sensor (VSS)

6. Locate the VSS and test its output using a multimeter or oscilloscope. Ensure it is providing the correct voltage and signal

7. If the VSS is faulty, replace it

8. Check the Instrument Cluster

9. If the vehicle has an electronic speedometer, ensure that the instrument cluster is functioning correctly. A malfunctioning cluster can lead to incorrect speed readings

10. Inspect the ABS Module

11. In some vehicles, the ABS module also plays a role in providing vehicle speed data. Check for any issues with the ABS system, including sensors and wiring

12. Scan for Communication Issues

13. Use a scan tool to check for communication errors between modules. Ensure that all modules are communicating properly and that there are no communication faults

14. Check for Software Updates

15. Sometimes, a software update for the vehicle's control modules can resolve communication issues. Check with the manufacturer or a dealership for any available updates

16. Clear Codes and Test Drive

17. After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

18. Consult Repair Manuals or Technical Service Bulletins (TSBs)

19. Look for any specific repair manuals or TSBs related to your vehicle make and model that may provide additional guidance on troubleshooting U1312

20. Seek Professional Help

21. If the issue persists after performing these steps, consider seeking help from a qualified mechanic or automotive technician who has experience with your vehicle's make and model. By following these steps, you should be able to identify and resolve the underlying issue causing the U1312 code