Garmin GIA 64 units purchased or installed since April 2021 listed in the link below are affected.
GIA 64 unit serial numbers can be viewed on the AUX – System Status page.
Some GIA 64 units may experience a COM receiver failure and/or open squelch.
The COM transmitter is not affected by this issue.
Be aware the COM receiver may fail and or squelch may stay open.
Contact your local Garmin dealer for compliance with Garmin Service Bulletin 2194.