U2428 – Vehicle Speed Signal Communication Error

The ODBII code U2428 indicates a communication error related to the vehicle speed signal between the engine control module (ECM) and other control modules in the vehicle.

The severity of ODBII code U2428 is moderate.

Common Causes For: U2427 Invalid Data Received from Vehicle Dynamics Control Module.

• Faulty vehicle speed sensor
• Damaged wiring or connectors
• Poor electrical connections
• Malfunctioning engine control module (ECM)
• Issues with the transmission control module (TCM)
• Faulty ABS module
• Software glitches or updates needed
• Interference from aftermarket modifications or devices

Common misdiagnosis for U2428 Vehicle Speed Signal Communication Error

• Wheel speed sensor failure
• ABS module issues
• Transmission control module problems
• Faulty vehicle speed sensor
• Wiring or connector issues
• Engine control module (ECM) faults
• Incorrect tire size or pressure
• Faulty instrument cluster
• Software glitches in the vehicle’s computer systems
• Problems with the CAN bus communication system

Common Troubleshooting Steps

The OBD-II code U2428 indicates a “Vehicle Speed Signal Communication Error.” This code typically points to a problem with the communication between the vehicle’s modules regarding the vehicle speed signal. 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 additional trouble codes. Other codes may provide more context or indicate related issues.
• Inspect Wiring and Connectors:
• Examine the wiring and connectors associated with the vehicle speed sensor (VSS) and the modules that communicate the speed signal. Look for frayed wires, corrosion, or loose connections.
• Pay special attention to the connectors for the Engine Control Module (ECM) and any other relevant modules.
• Test the Vehicle Speed Sensor (VSS):
• Locate the VSS and test its output using a multimeter or oscilloscope. Ensure it is producing the correct voltage and signal.
• If the VSS is faulty, replace it.
• Check for Ground Issues:
• Ensure that all ground connections related to the VSS and communication modules are secure and free of corrosion. Poor grounding can lead to communication errors.
• Inspect the CAN Bus:
• The vehicle speed signal is often transmitted over the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens.
• Use a CAN bus scanner to monitor the communication and check for any abnormalities.
• Verify Module Functionality:
• If the VSS and wiring are functioning correctly, the issue may lie with one of the modules (e.g., ECM, Transmission Control Module). Check for software updates or reprogramming needs.
• If possible, test the modules in another vehicle to confirm their functionality.
• Check for Interference:
• Look for any aftermarket devices or modifications that may interfere with the vehicle’s communication systems. Remove or disconnect them to see if the issue resolves.
• Clear Codes and Test Drive:
• After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the vehicle speed signal and communication systems.
• Seek Professional Help:
• If the issue persists after performing these steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with your vehicle’s make and model. By following these troubleshooting steps, you should be able to identify and resolve the cause of the U2428 code.