Albert, thank you for taking the time to help find a solution to my issue, However, you still don't understand what I am trying to do.
The way CAN transceivers work is you connect CANH and CANL to the bus and then connect TX_RX to your CAN controller. I have several controllers and transceivers in my circuit. What I am trying to do is break the physical connection of the bus to an external device on the CAN BUS, which is outside of my circuit. However, when my MCU goes off line, I need to restore that physical connection. In the real world a simple physical switch would accomplish this task , but I need a digital electronic method of accomplishing this.
I think I am going to try a small relay.