It is all part of emissions. Cant have stray vapors causing climate change. blah blah.
If it was a gas motor, yes it will give a code. Not sure about the diesel.
Oh yes the climate change lol...
Yeah I wasn't sure if these new diesels had any kind of evap system on them either like the gasers.
Thinking about this at work today. I remember there was a little spring in the fuel cap as well.
Inside the fuel cap there's a hole down the center with a rubber seal held in the sealed position with spring pressure. So as fuel is being burnt it creates a vacuum enough to overcome the spring pressure letting in sufficient air. So in actuality the tank just keeps breathing in and in and in, never venting. So thinking about it now the vacuum that I'm hearing is not enough to overcome the spring.
Didn't realize that's how it works.
Working as designed I'd say.
Not dumb just slow..lol
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