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 speed is greater than 400 RPM.
The ignition voltage is between 9-18 volts.
DTC P3401, P3425, P3441, and P3449 runs continuously when the above conditions are met.