Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle speed is greater than 8 km/h (5 mph).
The engine speed is less than 7,000 RPM.
The engine load is less than 60 percent.
Engine misfire is detected and DTC P0300 sets with the MIL illuminated.
DTCs P1380 and P1381 run continuously when the above conditions are met.