What Does P0440 Mean. Asked Aug 17 2014 by William. This code indicates a leak in the fuel vapor system know as the evap system this can be caused by several things.
Patient is a 2002 Trailblazer 42 presenting with a p0440.
Asked by applepie in Martinez CA on. Had vent valve replaced. Chevy Trailblazer P0440 OBDII Code Symptoms The check engine light is often the only sign P0440 code has been triggered. To isolate the exact problem requires a high end scan tool and a smoke machine to find the problem.