2001 - 2002 - 2003 - 2004 - 2005 Pontiac Sunfire, Aztek, Montana & Trans Sport Radio AM FM CD Player - Upgraded with Auxiliary Input 3.5 mm jack for use with iPod, iPhone, Android, mp3 Players, Satellite Radio & more! Various Part Numbers. Option Code: U1P. These vehicles came equipped with different option codes that may not be compatible with this radio. Please confirm this is the part you need before purchase. Please Note: This radio will need to be unlocked upon installation in your vehicle. It can often be put into a fully functioning test mode for 10 minutes at a time without the vehicle running but will need to be taken to a dealer for permanent pairing. The price for this varies so please make arrangements before purchase. This is for a Pontiac Sunfire, Aztek, Montana & Trans Sport radio that has been upgraded with Aux Input on the face of the radio. It is a fully functioned CD Player, option code U1P. If this is not the exact model your vehicle came equipped with, please confirm fit with a GM dealer or give us a call for assistance.