po440 po455 po456 2007 Chrysler pacifica

Question

Wifes car is throwing these three codes. Replaced gas cap. Dropped gas tank no broken elbows on fuel pump and no noticeable holes\cuts in lines. Don't have any idea where to go from here. Any one else have the same problem? Thanks

Answer 1

P0440 General Evap system failure

P0455 Evap system large leak

P0456 Evap system small leak

No leak this is usually a problem with the ESIM (evaporative system integrity monitor) Which is the number 5 in this diagram.there is a weight that serves as a check valve. if this is not in a verticle position it stays open and you get the code condition.or the weight just gets stuck in the open position