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My poor def quality light came on and a friend of mine tried to run the regeneration test and scan. 10 minutes into the test it shut off and kicked the scanner out and won’t give a code or reason! We tried two different scanner tools same results any advice is appreciated!!!!
 

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2017 2500HD LTZ Z71 Custom Sport Ed, MW7
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Adding on to what cfell mentioned--> Did this happen after filling the DEF tank? Has the truck been sitting a while with old DEF in it? You could always test your DEF with a refractometer. If I received this code, I would first check the fluid and replace it with new fluid after flushing the tank. All you need are a couple of drops to test. Target range for DEF is 32.5%, if under, more concentration is needed (new fluid probably). You can remove the fluid with a fluid evacuator pump. These can suck oil or fluids out of tanks with no drain plugs/ports. You would need the below.

If however you have already done this and have moved on, what FreedomOne said is good advice about looking at the sensor and injector.

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More than likely the def isn't the issue and it's a nox sensor or def injector. Your good concentration wise anywhere from 28 to 34. Some say as low as 26%. Check def concentration first then your nox sensors while warm and running, compare the difference between 1 and 2. Might pull the def injector to see if it's clogged.
 
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My poor def quality light came on and a friend of mine tried to run the regeneration test and scan. 10 minutes into the test it shut off and kicked the scanner out and won’t give a code or reason! We tried two different scanner tools same results any advice is appreciated!!!!
I'm having the same problem with my Colorado 2.8 diesel. I took it to the dealer and they replaced a wiring harness that was corroded, a control module and a fluid level senor.

3 weeks later the message came back on its annoying and I have to take it in again. If it keeps having problems I'm going to get rid of it.
 

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2015.5 Silverado LTZ 3500 SRW
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People.. If you have a LML please post the year..
2015 and 2016 are a different body..
 
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