Conditions for Running the DTC

Before the engine control module (ECM) can report DTC P0446 failed, DTCs P0442, P0456, and P0496 must run and pass.
DTCs P0106, P0107, P0108, P112, P0113, P0117, P0118, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0300, P0402, P0404, P0405, P0406, P0443, P0452, P0453, P0462, P0463, P0488, P0502, P0506, P0507, P2195, and P2196 are not set.
The ignition 1 voltage is between 11-16 volts.
The barometric pressure (BARO) is more than 72 kPa.
The engine coolant temperature (ECT) and the intake air temperature (IAT) at start-up are between -5°C and +40°C (23°F and 140°F).
The purge enable time is less than 360 seconds.
The fuel level is between 24-94%.
The start-up IAT minus the startup ECT is within 12°C (22°F).
The start-up ECT minus startup IAT is within 50°C (90°F).
DTC P0446 runs once an ignition cycle when the above conditions are met.