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.

The PCM detects a low voltage on the AIR pump relay control circuit with the key ON and the AIR pump relay commanded OFF.
The condition exists for at least 2 seconds.