P0201, P0202, P0203, P0204, P0205, or P0206
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 the injector control circuit is open for greater than 4 seconds or for a cumulative of 50 seconds.