Conditions for Running the DTC

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The ignition voltage is between 11-18 V.
The engine speed is greater than 400 RPM.
The ECM driver transitions from ON to OFF or from OFF to ON.
DTC P0480 and P0481 run continuously when the conditions above are met.