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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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Perhaps only if it's excessive related to the amount of exhaust flowing through it (and thus, NOx).

There are NOx sensors before and after the SCR that would adjust the amount of DEF in accordance to the NOx "content" of the exhaust gasses.
 

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COTM Winner
2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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6,739 Posts
Pre-SCR NOx sensor would pick that up and use extra DEF to bring the post-SCR NOx reading down back to what it wants. Like I said before.
 
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