Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle speed is above 8 km/h (5 mph).
The engine speed is below 7,000 RPM.
The engine load is less than 60 percent.
Engine misfire is detected and DTC P0300 is set with the MIL illuminated.
DTC P1381 runs continuously when the above conditions are met.