Conditions for Running the DTC

WARNING: This page is about a different variant/trim than selected.

Before the ECM can report DTC P0449 failed, DTC P0451 must run and pass.
The engine speed is more than 80 RPM.
The ignition 1 voltage is between 10.5-18 volts.
The ECM has commanded the EVAP canister vent valve ON and OFF at least once during the ignition cycle.
DTC P0449 runs continuously once the above conditions have been met.