Set Condition

WARNING: This page is about a different car, the 1995 Pontiac Bonneville, 1995 Oldsmobile Eighty-Eight, and 1995 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

Code P0321 will set when the following conditions are present.

PCM detects 150 fuel control reference pulses (50 crank revolutions) and no spark reference pulses.
Engine speed is less than 1200 RPM.
Engine is running.