I had a 2013 F350 chassis cab with the 6.2 in it that was setting a P06B6 for PCM knock sensor internal processor fault. The only pinpoint test steps listed in the pced is to reflash the PCM to the latest level, clear codes and if it comes back then replace the PCM. I looked at it initially and then one of my co-workers put the module in it. A week later it is back with the same code. Ended up finding the #7 coil arching intermittently between where the wire for the second plug attaches and the coil plug. But it never had a misfire. Replaced the coil and plug wire and the code did not return.