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Discussion Starter · #1 ·
Got an engine light the other day and I'm just about out of warranty so off to the dealer it goes.
2013 GMC Sierra 2500 LML.

The one code reads P22FA which should be a NOX sensor, but there were 2 dealer specific codes we couldn't read with the reader we had available. If i remember correctly, they were DDC or DTC codes.

What could or would they be, and are they related to the NOX sensor malfunction.

Just want to make sure they don't ignore something that will haunt me later when the warranty is expired. Last thing I need or can afford is expensive repairs in the future.

Thank in advance,
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