I have replaced the solenoid and VPS (vein position sensor). The VPS is right on top of the turbo with a small wire coming out of it and a large blue plug on the other end. Easy to replace but expensive. The solenoid is located to the left of the sensor and goes into the turbo horizontally. There is one bolt that holds it in and it is also easy to replace. Not sure on the price cause I had one from another factory turbo. On the LBZ's the code for the sensor is P003A and you will know if it goes bad cause you will only build boost at high rpm's. Hope this helps!
Truck: 06 CC/SB LBZ "The Screamin Demon"
4094 AVNT w/ Danville billet wheel
PPE Stage 5 trans, PPE Lift Pump, PPE Gauges, Maifolds/Up pipes
All Season Y-bridge and EGR Delete
DTS Stainless DP & Hot Side IC
AFE Intake Labonte Stage 3 Water/Meth
Zone 6" Lift, Dodge Posi
Evil Arc Fab Steering, Bumper, Welding Bed and Coolant Re-route
35" BFGs, 16" PCXA Wheels
12.67@105 1/4 Mile
2006 CCSSSB Vortec Max 4x4
6" Rancho, 33"s, 4.56 gears, Volant and efi live