U1677 – Invalid Data Received from Vehicle Control Module.
The ODBII code U1677 indicates that the vehicle’s control module has received invalid or corrupted data from another control module, which may affect vehicle performance or functionality.
The severity of ODBII code U1677 is generally considered moderate.
Common Causes For: U1676 Invalid Data Received from Vehicle Control Module.
- Faulty Vehicle Control Module (VCM)
- Poor or damaged wiring/connectors
- Corrupted software or firmware in the VCM
- Communication issues between modules
- Faulty sensors sending incorrect data
- Grounding issues
- Interference from aftermarket devices or modifications
Common misdiagnosis for U1677 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
- Problems with other control modules affecting communication
- Battery or power supply issues affecting module operation
Common Troubleshooting Steps
The OBD-II code U1677 indicates that the vehicle’s control module has received invalid data from another control module. This can be caused by various issues, including communication problems between modules, wiring issues, or even a faulty control module. Here are some common troubleshooting steps to diagnose and resolve the U1677 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 the root cause of the issue.
- Inspect Wiring and Connectors: Examine the wiring and connectors associated with the control modules involved. Look for signs of damage, corrosion, loose connections, or frayed wires. Repair or replace any damaged components.
- Check for Ground Issues: Ensure that all ground connections for the control modules are secure and free of corrosion. Poor grounding can lead to communication issues.
- Inspect Control Modules: If possible, check the control modules for any visible signs of damage, such as burnt components or water intrusion. If a module appears damaged, it may need to be replaced.
- Perform a Network Test: Use a scan tool to perform a network test to check the communication between the control modules. This can help identify if a specific module is not communicating properly.
- Update Software/Firmware: Check if there are any software or firmware updates available for the control modules. Sometimes, manufacturers release updates to fix known issues.
- Clear Codes and Test Drive: After performing any repairs or inspections, clear the trouble codes and take the vehicle for a test drive to see if the code returns. This can help confirm whether the issue has been resolved.
- Check Battery Voltage: Ensure that the vehicle’s battery is in good condition and fully charged. Low voltage can cause communication issues between modules.
- Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U1677 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
- 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 can systematically identify and resolve the underlying issue causing the U1677 code.