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2007 CTS
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Discussion Starter #1
I have done some searching but cannot find a answer. I understand this (U1016) is a "history" code? What does that mean? What is the most probable cause of it coming up.

It also came up with a P0496, which in most cases I believe would be a loose gas cap. Checked it, it is tight. Any other probable causes?

I am just about ready to give up and sell this thing.

Thanks in advance for any assistance
 

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Don't know if P0496 is triggered by a gas cap leak, but if so, it could be loose or defective. Also, it may take three cold starts to turn off the CEL.
 
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