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What's up fellas. So I've just had my first big issue with the diesel and am going back to dealer to talk with them today. I'll keep everyone posted on how everything goes. So my engine light came on a month ago and I rode it out hoping it would correct itself. Unfortunately it didn't and I got the dreaded 60 miles till speed is limited to 65mph. Took to dealer yesterday and the exhaust became disconnected where the particular filter and exhaust meet under the car directly beneath the shifter. The studs that are welder to the filter snapped off leaving my exhaust to just hang there. 170 dollars for dealership to fix. Once fixed 3 codes were fixed but 2 codes for the nox sensor didn't go away. Dealer wants me to agree to 2 hours so tech can inspect wiring,connections, etc to find problem and then contact gm to see if it's covered. Doubt it will be covered, odometer reads 62000 miles. Figured I'd post to see if anyone has any ideas why the 2 codes are still there. My guess is the sensors are built up because of the issue I had with exhaust being separated and driving a good month before taking in. The car was running great the whole time the check engine light was on and didn't sound any louder. so just guessing that eventually the regens weren't affective and caused the limit to 65 mph after driving with problem. I'm gonna ask for a manual regen when I speak with them today before I buy new sensors and install myself. Any help or insight is greatly appreciated