U1629 – Invalid Data Received from Vehicle Control Module.

The ODBII code U1629 indicates that the vehicle’s control module has received invalid or corrupted data from another control module in the vehicle.

The severity of ODBII code U1629 is generally considered moderate.

Common Causes For: U1628 U1628: “Vehicle Communication Bus Malfunction”

• Faulty Vehicle Control Module (VCM)
• Corrupted or damaged wiring harness
• Poor electrical connections or grounds
• Faulty communication network (CAN bus issues)
• Software or firmware issues in the VCM
• Malfunctioning sensors or actuators
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1629 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty sensors or actuators
• Corrupted software or firmware in the control modules
• Issues with the OBDII connector or communication port
• Battery or power supply problems
• Other unrelated control module failures

Common Troubleshooting Steps

The OBD-II code U1629 indicates that there is invalid data being received from the vehicle control module (VCM). This can be caused by various issues, including communication problems between modules, wiring issues, or faults within the VCM itself. Here are some common troubleshooting steps to diagnose and resolve the U1629 code:

• Check for Additional 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.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the VCM and any related modules. Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely plugged in and that there are no bent pins.
• Check for Communication Issues: Use a scan tool to check the communication between the VCM and other modules. If other modules are not communicating, there may be a network issue.
• Verify that the CAN (Controller Area Network) bus is functioning properly. You can use a multimeter or oscilloscope to check for proper voltage levels and signals on the CAN lines.
• Inspect the Vehicle Control Module: If the wiring and connections are good, the issue may lie within the VCM itself. Check for any signs of physical damage or water intrusion.
• If possible, perform a software update or reset the VCM to see if that resolves the issue.
• Check for Ground Issues: Ensure that the VCM has a good ground connection. A poor ground can lead to communication issues and invalid data being sent.
• Test the Battery and Charging System: A weak battery or charging system can cause communication problems. Check the battery voltage and ensure that the charging system is functioning properly.
• Clear the Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the U1629 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in troubleshooting.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U1629 code.