Conditions for Setting the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The FRP sensor is below 0.352 volt or above 0.650 volt when the ignition is ON and the engine is OFF.
OR
The FRP sensor is below 0.352 volt or above 0.650 volt within 70 seconds of the ignition being turned OFF.