The gas cap code is a common diagnostic trouble code that might turn on your check engine light. I put together a video discussing a problem my neighbor had with his vehicle after they filled the fuel tank.
It is a common scenario that I see often. As you can see in the ladder diagram from the service manual, action step 1A is to check the fuel cap. Note: By popular demand I added a common evap system electrical diagram at the bottom as well.
You can see the short video and diagram below. But first I wanted to talk a little more about the gas cap code and the possible causes. On some automobiles it is known as the P0440 code.
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