Cel p0440

[ILLEGAL REGAL]

Got that code, popped the gas cap to check that and there was a big whooosh sound from either vacuum or pressure.
Would that more likely single out the solenoid or something else?

[07Burb]

I get that big "whoooosh" sound when opening the cap sometimes when the tank is low and it's a hotter day outside. It's never been a big issue for me. When you put the cap back on did the code go away?

[ILLEGAL REGAL]

Not yet it hasn't. But I did have the light come on once before and never pulled the code, did the same sound and light went off