u021a u021a missing message from vehicle communication network
OBD2 Code: U021A
Description: Missing Message from Vehicle Communication Network
Definition: This code indicates that there is a loss of communication with the vehicle’s communication network. It means that one or more modules on the vehicle are not able to communicate with each other as expected, which could be due to wiring issues, module failures, or network problems.
Severity: Moderate
Common Causes
Common causes of this OBD2 code include:
- Interference in the communication network
- Faulty wiring or connections in the communication system
- Defective control module that is not sending messages properly
- Software issues with the vehicle’s onboard computer system
Common Misdiagnosis
OBD2 Code: U021A
Description: Missing Message from Vehicle Communication Network
Common Misdiagnosis: Faulty control module or wiring issues are often misdiagnosed as a problem with the vehicle’s communication network.
Common Diagnostic Steps
OBD2 Code: U021A
Description: Missing Message from Vehicle Communication Network
Common Diagnostic Steps:
- Check for any other stored trouble codes that might indicate a related issue.
- Inspect the vehicle’s communication network wiring and connectors for damage or corrosion.
- Verify the integrity of the CAN bus system using an oscilloscope or scan tool with CAN capabilities.
- Ensure all relevant modules are receiving power and ground connections properly.
- Test the suspect module to ensure it is functioning correctly and not causing communication issues.
- If necessary, update or reprogram the software in the affected module(s).
- Clear all codes and test drive the vehicle to see if the code returns.