Conditions for Running the DTC

Before the engine control module (ECM) can report DTC P0455 failed, DTCs P0443, P0451, P0452, P0453, P0458, and P0459 must run and pass.
DTCs P0100, P0101, P0102, P0103, P0111, P0112, P0113, P116, P0117, P0118, P0119, P0125, P0443, P0446, P0449, P0451, P0452, P0453, P0458, P0459, P0496, P0498, P0499, P0560, P0562, P0563, P0721, P0722, P2122, P2123, P2127, P2128, P2138, P2227, P2228, and P2229 are not set.
The ignition voltage is between 10.5-18 volts.
The engine run time is more than 10 minutes or the fuel trim is stable.
The fuel tank pressure is between -10.0 and +4.0 in. H2O (-18.7 and 7.49 mm Hg).
The fuel system is operating in Closed Loop.
The engine is idling.
The barometric pressure (BARO) is more than 68 kPa.
The fuel level is between 12-88 percent.
The calculated ambient air temperature is between 2-32°C (35-90°F).
The coolant temperature at engine start is within 10°C (18°F) of the calculated ambient air temperature.
The vehicle speed sensor (VSS) is less than 3 km/h (2 mph).
The above conditions are met for more than 11 seconds.
DTC P0455 will attempt to run up to 10 times or the test completes successfully once per ignition cycle.