Conditions for Setting 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 ECM detects that the voltage on the cruise control switch signal circuit is greater than 3.5 volts.
The above condition is present for greater than 1.5 seconds.
The ECM/PCM runs this diagnostic every 0.05 second.