When upgrading to a Sync 4, and the vehicle does not need an ACM upgrade for X65, the Sirius XM can result in a buffering that causes a delay. This delay is usually a result of pausing the song when a phone call is being made. Once the call is ended, the Buffering will occur, but this can be sped up by pressing play or pressing LIVE on the radio source. This isn't actually an issue, but how the system works when upgrading to Sync 4.
Sync 4 Upgrade using Factory ACM
Buffering for Sirius XM after upgrading
D
Written by David C Funk
Updated over 6 months ago