2014 Chevrolet Impala P0011 & P0014 to P062B: What Causes This Engine Fault and How to Fix It?

I own a 2014 Chevrolet Impala LT and recently encountered a series of check engine light issues. The problem started when my car began making an unusual noise between 1000 and 2000 RPMs, prompting me to visit Auto Zone for diagnostics. They initially returned codes P0011 and P0014, which relate to camshaft position sensor issues or variable valve timing solenoid malfunctions. I was advised that the issue wasn't necessarily with the sensors themselves but more likely the Engine Variable Timing Solenoid (EVT). I replaced both solenoids based on this recommendation. However, after the replacement, the check engine light remained on and the strange noise persisted. My car then refused to start entirely — OnStar detected a 'Battery Charging System Failure' and called a wrecker to jump-start it. After resolving that issue, OnStar performed a system diagnosis and returned a new code: P062B (ECM). This indicates that the Engine Control Module has detected an abnormal performance in the fuel management system. My key questions are: - Are camshaft position sensors and timing solenoids the same component? - Is it typical for P062B to appear after replacing solenoids, especially when earlier codes like P0011 or P0014 were present? - Why didn't the ECM report this issue earlier? I’ve already inspected the intake manifold and found significant knocking — suggesting a potential internal engine problem. I’m now considering taking it to a GM dealership for further diagnosis, as Auto Zone technicians are not considered certified professionals in terms of technical troubleshooting. Can anyone provide insight into whether P062B is directly linked to solenoid replacement or if there’s another underlying issue? Any advice on next steps would be greatly appreciated.