P0451 - Part 1

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The vehicle speed is greater than 0 km/h (0 mph).
The ambient pressure is greater than 68 kPa.
The estimated ambient air temperature is warmer than -7°C (+19.4°F).
The fuel level is between 12-88 percent.
DTC P0451 runs continuously when the above conditions have been met.