: Next issue..... ground noise in XM mode

07-26-11, 08:07 PM
Looking for some advice regarding ground noise..

So here is a question, when I am listening to the radio, watching a dvd or using my i-pod the sound is nice and clear. On XM there is a faint ground noise that gets louder with volume and engine rpm (ground loop i assume) Is there a fix without having to add a ground loop isolator?? Like i said its only in XM mode.:mad:

07-27-11, 05:43 PM
Did you add anything after market to the truck?

07-27-11, 08:26 PM
Do you hear any noises when using onstar. I would have to look into it. But think the XM and onstar use a different antenna then the radio. But that would be my quick guess to check out first.

08-01-11, 01:25 PM
Nothing added that I am aware of. Where is the On-Star located? My trailblazer SS had issues with on-star and I had to pull the control box under rear passenger seat for repair .... You would think GM would have this stuff sorted after 15 years...lol