My Check Engine light came on and gave me two codes. One was for the camshaft position sensor which I replaced but the second one P0023 was shown as an undocumented code on my scanner. I found a MB trouble codes book online and the P0023 code is this B Camshaft position-Actuator Circuit Bank 2. I can clear the code but it comes right back. Where do I go from here? I haven't found any info. on an Actuator Circuit or a repair remedy.