Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The engine is operating.
The ignition voltage is between 11-18 volts.
The engine speed is between 600-5,000 RPM.
The DTCs run continuously once per crankshaft revolution after the above conditions are met for 20 crankshaft revolutions.