Conditions for Setting the DTC
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Voltage at the pressure sensor signal output to the EBCM falls outside the 0.25-4.75 volts range for more than 100 milliseconds.