P0341, P0346, P0366, P0391

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 a signal from the CMP sensor, but the number of pulses are less than or greater than what is expected for one crankshaft revolution.
OR
The CMP sensor does NOT correlate to the crankshaft position.
Either condition must exist for greater than 4 seconds, or cumulative of 50 seconds.