Conditions for Running 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 engine is cranking or operating.
The ECM has detected more than 12 camshaft revolutions.
DTC P0338 runs continuously once the above conditions are met.