How do I connect an mp3 to my 2008 sonata?

If you can get access to under the antenna check that the wiring plug is fully inserted.

Troubleshooting the problem may depend on which of several radio options is installed in your vehicle. However, the most probable cause is the antenna. Two different antennas are involved here - one for XM (satellite), one for FM (terrestrial - window type). To start, I would check the FM antenna connections at the window and the radio and the cable between them. If that isn't the problem, the radio is probably faulty.

no.
purchas an adapter that will allow you to convert one of your XM channels to an AUX input.

Hi, if it has a plug for the ipod. Yes, You may need to buy an adapter to fit the plug on your radio.

There is a cable/jumper to do such a thing and you can get the cable/jumper either through someone on ebay or try one of the local audio connection stores.

Same problem here. I repeatedly complained to XM but got no reply. I listen to XM in 2009 Sonata and it was just as bad.

XM is better than AM. Much worse than FM.

That interface most likely is not going to work, because it is not compatible with all the gm radios, don't work good with XM and rear video system,
the problem is the wiring and the software on the interface,

the PIE GM12-AUX v2 works with all the radios in gm vehicles,
radio needs to have a BAND button and CD/AUX

Buy a subscription.

car dealers lie and lie and lie...now you know.  Can they replace the radio with the cheaper radio from the Sonata or Tuscon?  Call the area manager and complain.  Or you can burn mp3 cd's that hold about 120 songs each.

Call the XM service number, they will refresh your signals. If it was the head unit, the same problem would occur during AM/FM signal transmission