I got a code on my 2004 Duramax. I had the valve turned off when I filled the TransferFlow tank. When I started a 3000 mile trip, of course I opened the valve. After I drove about 75 miles I got a check engine light. Worried me, but the truck still ran good. When I returned home I took the truck to my local Truck shop. Found out the code was because you can’t fill up while driving at 60mph. Lesson learned.
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