Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
P0506
The actual engine speed is 94 RPM less than the desired idle speed for 10 s.
P0507
The actual engine speed is 188 RPM greater than the desired idle speed for 10 s.