I had code P0456 in my 2010 Dodge Ram truck. I did some research and this is an emissions code related to the evaporator system that could be caused by a bad gas cap. I ordered this Dodge OEM cap and it solved the code issue. It may not work for all other codes like mine. But the swap was very easy, and the price didn't break the bank. So even if that didn't work, at least I had a new gas cap.
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