Vent valve stuck open

Question

Replaced vent valve with new,and smoke tested for leaks with none to be found. Still get a code vent valve as stuck open! P2421 code.

Answer 1

Hi there

More then likely the issue is with the pressure sensor or it's wiring. The computer uses the pressure sensor to know when to open and close the valve. If the pressure isn't changing, then the computer thinks the valve is open