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I have a 2013 3500 that the light comes on about 10 to 20 minutes after I start towing. I checked it with my cheapo code reader and it is for NOX sensor A. After the truck sits for a few hours when I start it the light is off. I'm assuming it's happening when the exhaust gets hot but not sure what the fix is? Do I need a new sensor?

Edit: The code is U029D lost communication with NOX sensor A
 

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That's what mine did exactly. The NOX sensor eventually failed and was replaced.under warranty. It's not cheap.
 
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