po641 chevy silverado 2007 what color is the 5v ref wire at the ecu

Question

Cleared code ran good for a few hours back to reduced power po641. What color is the 5v reference wire at the ecu harness connection? Can one shorted sensor in the curcuit cause reduced power?

Answer 1

P0641 5-volts reference 1 circuit

Yes one sensor can be shorting out causing reduce power, For the first inspection disconnect the ECM and inspect the pins for any corrosion or loose pin at its connection and terminal, The color for the 5 volt refernce is Grey/White. The camshaft is Dark blue.The APP is White/Black. What the 5 volt reference 1 are MAP (manifold absolute pressure),Fuel tank pressure (FTP).A/C refigerant pressure sensor,APP sensor 2,Engine oil pressure (EOP),Camshaft position sensor.It is very highy suspectable that the ECM is faulty.