U1377 – Invalid Data Received from Vehicle Control Module.

The ODBII code U1377 indicates that the vehicle’s control module has received invalid or corrupted data from another control module, leading to communication issues within the vehicle’s network.

The severity of ODBII code U1377 is generally considered moderate.

Common Causes For: U1375 Invalid Data Received from the Transmission Control Module (TCM).

• Faulty Vehicle Control Module (VCM)
• Poor or damaged wiring/connectors
• Corrupted software or firmware in the VCM
• Communication issues between modules
• Low battery voltage or electrical issues
• Faulty sensors sending incorrect data
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1377 Invalid Data Received from Vehicle Control Module.

• Faulty Vehicle Control Module (VCM)
• Wiring issues or shorts in the communication lines
• Faulty sensors or actuators
• Incorrectly programmed or updated software
• Issues with the Engine Control Module (ECM)
• Problems with the Transmission Control Module (TCM)
• Battery or power supply issues
• Corrupted data from other modules

Common Troubleshooting Steps

The OBD-II code U1377 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 modules themselves. Here are some common troubleshooting steps to diagnose and resolve the U1377 code:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• 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 Short Circuits or Open Circuits:
• Use a multimeter to test for continuity in the wiring harness. Look for any short circuits or open circuits that could be causing communication issues.
• Inspect the Vehicle Control Module (VCM):
• If the wiring and connectors appear to be in good condition, 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 and other related modules have a good ground connection. Poor grounding can lead to communication errors.
• Test Other Modules:
• If the VCM is functioning properly, check other modules that communicate with it. There may be a fault in another module that is causing the invalid data.
• Perform a Network Test:
• Use a scan tool capable of performing a network test to check the communication between modules. This can help identify if a specific module is not responding correctly.
• 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 returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1377 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues.
• Seek Professional Help:
• If the issue persists after performing these 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 can systematically identify and resolve the underlying issue causing the U1377 code.