[weehe126]

I've had both these codes pop up a few days apart. First I got the 2C57 (underboost) was in 5th, maybe 30% throttle, not enough to trip stealth gauges. Second I got the 2C56 (overboost) was in 6th cruising on the highway, may have been accelerating a little. Code sheet says my options are bad pressure sensor, bad electropneumatic pressure converter, wastegate stuck open or closed, or boost leak for the under.

Since the codes contradict themselve, I'm guessing its electronic related. I read someone having this code while at WOT and it was a bad electropneumatic pressure converter. Since I was not WOT, I'm guessing it might be the pressure sensors. Anyone have any input on this. I'd prefer not to throwing parts at it.