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Exhaust fluid system see owners manual now. 39,000 klm 2016…

Customer Question
Exhaust fluid system see...

Exhaust fluid system see owners manual now.

Mechanic's Assistant: How many miles are on the car? How has your mileage been lately?

39,000 klm 2016 Sierra. Stopped and filled DEF but still have same message.

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

No, wasn’t sure where to start.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Not right now

Submitted: 7 months ago.Category: GM
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Answered in 5 hours by:
11/19/2017
GM Mechanic: Chris (aka- Moose), GMC Technician replied 7 months ago
Chris (aka- Moose)
Chris (aka- Moose), GMC Technician
Category: GM
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If the system was not low then the other possible causes are the fluid is contaminated, there is a NOX sensor bad, the DEF fluid injector is faulty. Step one is to get a scan tool connected to get the codes. These codes will tell use the diag steps to follow to a repair.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

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