Theory Of Operation
WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
For the Variable Camshaft Timing (VCT) to enable, the oil pressure has to be approximately 42 psi. For the VCT to remain enabled the engine oil pressure can not drop below 31 psi.