I find it weird Vortech guys getting the P0451 code. I also can't fathom how is a thread from July 2013 and to this date no one has a clue what that code means.
P0451 - Evaporative Emission Control System Pressure Sensor Range/Performance
Read more: http://engine-codes.com/p0451.html#ixzz2xpJ6ZYo8
Faulty Evaporative Emission System (EVAP) Pressure Sensor
- Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
- Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
This happens to turbo cars who use the EVAP connector for boost control via an EBCS.
It is a code the tuner can just "remove check mark" in Ecutek and it won't appear again.
P0456 is related.