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Working on a 2011 Chevy express G 3500 with a 6.6 L diesel…

Working on a 2011 Chevy...
Working on a 2011 Chevy express G 3500 with a 6.6 L diesel engine. Customer complains of white smoke coming out of the exhaust. There is no check engine light or lights illuminated on the dash so we wanted to do a diesel regeneration however every time we try to do the regeneration with the snap on scan tool we get an error a few seconds into the regeneration that says device control limits exceeded. Please advise
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Answered in 4 minutes by:
3/20/2018
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,116
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified

Hello there, I am Cam.

I am Licensed technician at a GM dealership with more than 16 years experience. 
Like you, I am a user of this website and as such, any billing questions should be sent to customer service.

I ask that you please provide details and communicate with me so we can make your experience here worth 5 stars! I am around most days but not every minute of every day. If you reply while I am offline, I will respond when I am next online. 

I am reviewing your request and will post in a moment.

How heavy of white smoke?

Is it loosing coolant?

Pressurizing the cooling system?

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Customer reply replied 1 month ago
Coolant level is good . We were also unable to duplicate their concern and did not see any white smoke. And there are no messages displayed on the dash either. If it was burning coolant wouldn’t there be a check engine light?
Burning coolant would not set a check engine light. Typically though you would see a loss of Coolidge and a buildup of pressure above and beyond normal in the cooling system. I suggest you performed cooling system test to verify there are no leaks, then check for white smoke when you’re driving. Pay close attention on a coldstart up as well, are haps they are not allowing the system to fully warm-up and expecting perfectly clear exhaust straightaway.
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,116
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified
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GM Tech (Cam)
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