Error 21 - LIN communication error or shorted bus

What does 21 mean?

A Local Interconnect Network (LIN) communication error has occurred, indicating a problem with the data bus or lack of communication between components. This could be due to a shorted bus or faulty harness.

• Damaged or poorly connected LIN Bus communication harness at ESEC-UIB P8 connector
• Defective ESEC-UIB
• Defective Filter Circuit Board

Click steps to track your progress.

1. 1

   Verify that the LIN Bus communication harness at the ESEC-UIB, P8 connector, is well connected and not damaged.

2. 2

   If the harness is good, replace the ESEC-UIB.

3. 3

   If the problem persists, replace the Filter Circuit Board.