Key Features
DTC P0456 signals that the vehicle's PCM has detected a very small leak within the EVAP system responsible for managing fuel vapors. This leak allows vapors to escape, failing the system's pressure test. Common causes include a loose or damaged gas cap, small leaks in the fuel tank, cracked or rotted fuel lines/hoses, a cracked charcoal filter canister, or a damaged/stuck purge solenoid or vent valve.
