Conditions for Running the DTC

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. 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 11-18 V.
DTCs P3401, P3425, P3441, and P3449 run continuously when the above conditions are met.