DTC U0159: Lost Communication With Parking Assist Control Module A: Description
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The Parking Aid Module (PAM) sends the volume cutback message to the Body Control Module (BCM) via the High Speed Controller Area Network (HS-CAN). See PINPOINT TEST X: DTC U0159:00