It's been a year and still haven't addressed it?, you need a good scanner to get the codes or take it to a shop, this isn't something you can just throw a part at could be a variety of things including needing programming and/or calibrationNo. You get in and start-up, and within 10-20 seconds, the “service adaptive cruise control” or whatever message pops up. That’s it. There are no other lights, warnings, etc.