Communication Failure
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.
The master node on a LIN bus sends out messages at specific time intervals.
The master node on the LIN bus in question knows which type of response that a particular slave node shall send back for a specific message sent from the master node. If the master mode does not receive this response, it can set the diagnostic trouble code for failed communication with the slave node in question.