I think you have an incorrect part #. I looked on a GM parts website and that # is not listed under radio / antenna , even as a discontinued part , for a 2011.

 

It was used only on 2011 and 2012 Colorado and Canyon models. Enter parts number on AC Delco site and you can see picture of it.

 

It looks like you have two options for this. A salvage yard may be able to hook you up with one , best option I believe. In the past a dealership could do a regional or national part search for you through their data base and locate an item that is in inventory as NOS . Slim chance for that unfortunately but you can ask them .That is not likely as this wouldn't seem to be a part that would require replacement and not pose a need to stock one. It would only be ordered as needed from parts central , which we know discontinued it.

 

try car-part.com i see some listed and you can also do a live chat

 

did you try PN 20842596 showed as the PN for a 2011 Canyon

 

Ive been trying to figure out how that comes off. It keeps ripping a hole in my cover and i have thought of cutting it off. Has anyone ever had it removed?

 

Thanks, but that is just the little antenna that mounts onto the 20802740. I think that is used for just the cellular connection.

 

have you tried OEM.cats
link here -----> OEM Cats Here

 

Just turn the small antenna to the left and it unscrews from the mount.

 

I've tried and it won't turn. I've even tried penetrating oil with no luck of it loosening up and I definitely don't want to break it.

 

I replaced the XM Radio antenna on my 2011 Colorado today with GM Part number 20791465. Available on EBAY, and all works fine again!I

 

is it possible to add xm to a gm radio ?

 

I believe so, the XM radio is a module GM added to onto your AM/FM factory radio plus the roof top antenna. I see a lot of auto re-cyclers have them in their inventory. Mine Colorado came from the factory with XM radio. You might check with XM radio directly as they have an add on XM tuner & antenna packages... If you current truck radio has auxiliary input this would be an easy install.