Got the P0449 code said it was the vapor solenoid at the throttle body. Changed it cleared code, back on after 100 miles. Changed the lower vent solenoid cleared code back on after 100 miles. Changed the canister cleared code back on again. Took it to dealer they changed the lower vent solenoid , that’s twice now. They said something about a controller under the truck they thought they were going to have to change it was around $170 but felt like they got it fixed. 100 miles later it’s back in again. Anyone know what this controller is they were talking about?
