P0013 code what is causing this?

@kirbyrene according to the SM the P0013 2A85 is a 'B' Camshaft Position Actuator Circuit Open (Bank 1). these are related to a camshaft timing issue commonly cause by failed VVT solenoid on the exhaust camshaft. Bad camshaft position sensors can also cause this error.

Take a look on here as well as on here for more information.

Let us know the exact year and exact model for your BMW so we can hopefully get more from the service manual.