my 2006 ss/sc was going into reduced engine power/limp mode after i installed stage 2. after it warmed up i would throw multiple codes with the pain in my ass being P0068. apparently there are two sensor on or around the supercharger that have the same harness and they were switched. one is the baro sensor and im not sure what the other was; all the dealer said was one metered boost and the other was vacuum. i'm posting this in case someone else has the same issue and i hope this helps.

 

Well according to alldata the code is caused by "Throttle Body Airflow Performance"

Its probably the MAF sensor that is sitting on your S/C thats acting up. Either that you its your TB, but thats unlikley.

Hope this helps

 

never had any problems like that before but always good to know...

 

This is a correlation check. The PCM checks the MAP, MAF, SCIP and TPS readings to make sure they are all seeing similar values. If they aren't you get the code and reduced power.

Happened when you tune over the limits (in HP tuners) or one of the sensors above is malfunctioning. So if the MAF is reading WOF type airflow and the TPS sensor is reading 1/2 throttle you will get that code.