P0455 - EVAP Emissions Control System Leak Detected

The Powertrain Control Module (PCM) monitors the complete Evaporative Emission (EVAP) control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).

Possible Causes:
^ After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
^ Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube
^ EVAP canister purge valve stuck closed
^ Damaged EVAP canister
^ Damaged or missing fuel filler cap
^ Insufficient fuel filler cap installation
^ Loose fuel vapor hose/tube connections to EVAP system components
^ Blockages or restrictions in fuel vapor hoses, tubes or EVAP components
^ Vacuum cut valve blocked
^ EVAP canister vent control valve stuck open
^ Inoperative EVAP pressure sensor

Diagnostic Aids:
Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank.

Diagnostic Aids:
With no pressure applied to the EVAP pressure sensor the EVAP PS PID should read 3.0 - 3.6 volts.