I have an 02 Impala LS and have the infamous 0440 code. My wife owns the base model 3.4 liter Impala of the same year with higher milage and she has not had the 0440 code issure with her vehicle I was at the dealer the other day and I saw that the dealer service department are doing a land office business replacing Vent Solinoids part # H15208329. I replaced the gas cap and got some love for about a month and then the code reappeared. Is it worth the chance at replacing the vent solinoid, it would appear so since the dealer charges $40.00 to do a diagnostic? Any ideas from someone with a similar experience? It also appears unlikley to be a broken vent hose because the car is not that old!
