Being at home I can't look up the diagnostic concept for that code.
The only cam sensor codes I have dealt with were generated when the cam was installed with improper adjuster loading after head removal. I have seen this twice. Each time it was the first time the tech had done the reassembly.
The cam timing is changed at 3000 rpm if I recall. It might be valuable to view that activation. The controller has the ability to see both the results of activation (from the timing evaluation) but also by viewing the drop of voltage across an internal resistor that gives the controller a current evaluation. This is how the controller knows whether it is actually hooked up.
Bosch Master, ASE Master, L1
33 years MB technician