Voltage drop

On 10/17/2016 the check engine light came on.

U110C Lost fuel level message.
U0141 Lost communication with body control module A.
U1411 Implausible fuel volume signal received.
U110E Lost ambient temperature message.
P0700.
U0002 High Speed CAN communication bus performance.

What is the troubleshooting and where is the Body Control Module is located?

Today on 10/18/2016 no more heck engine light however the code are still stored