U1312 – Invalid or Missing Data for Vehicle Speed.

The ODBII 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.

The severity of ODBII code U1312 is moderate.

Common Causes For: U1310 CAN Communication Bus Off.

• 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 misdiagnosis for U1312 Invalid or Missing Data for Vehicle Speed.

• 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

Common Troubleshooting Steps

The OBD-II code U1312 indicates an “Invalid or Missing Data for Vehicle Speed.” This code is typically related to communication issues between the vehicle’s control modules, particularly concerning the vehicle speed data. Here are some common troubleshooting steps to diagnose and resolve this issue:

• 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.
• Inspect Wiring and Connectors:
• 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.
• Pay special attention to the wiring harnesses that connect to the engine control module (ECM) and the transmission control module (TCM).
• Test the Vehicle Speed Sensor (VSS):
• Locate the VSS and test its output using a multimeter or oscilloscope. Ensure it is providing the correct voltage and signal.
• If the VSS is faulty, replace it.
• Check the Instrument Cluster:
• If the vehicle has an electronic speedometer, ensure that the instrument cluster is functioning correctly. A malfunctioning cluster can lead to incorrect speed readings.
• Inspect the ABS Module:
• 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.
• Scan for Communication Issues:
• 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.
• Check for Software Updates:
• 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.
• Clear Codes and Test Drive:
• 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.
• Consult Repair Manuals or Technical Service Bulletins (TSBs):
• Look for any specific repair manuals or TSBs related to your vehicle make and model that may provide additional guidance on troubleshooting U1312.
• Seek Professional Help:
• 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.