386 ISX15 engine light

We bought a used 2012 386 ISX15 and within 50mi of bringing it home, the engine light came on. The electronic dash says "see operator's manual." The operators manual says "see engine manual." The engine manual says "see exhaust aftertreatment manual. That manual says that the light means different things for different engines, but is probably DEF related. I took it back to the dealer (not a pete dealer), but their computers won't interface with this new of a truck. I replaced the DEF filter, and the DEF pump sounds fine. It uses about one tank of DEF every second or third fuel fill. Any ideas?

 

No, haven't found a way to get the codes out since my dealer's computer won't talk to the truck. Gonna have to go to a different shop i guess. Thanks for the rawze link, I spent last night reading there, good stuff.

 

Its a Mack dealer, and when they plugged their laptop into the truck it came up with a message saying they need to pay cummins for an upgrade for this application, but it looks like i can get cummins insite and inline on ebay for $300. They said they had a $4000 piece of software in that computer. Will insite do everything i want, like read codes, change governed mph, and remove idle shutdown?

 

Thanks a bunch for the info. Idle shutdown is a real nag for loading grain.