Conditions for Setting the DTC
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
P0506
The actual idle speed is approximately 75 RPM lower than the desired idle speed.
P0507
The actual idle speed is approximately 150 RPM greater than the desired idle speed.