Monitor sensor reference A voltage

[l3elivE]

I have a 08 Duramax with a P0642 code. I was wondering if it's possible for me to monitor sensor reference A voltage with my flash scan V2.
Is it possible? If so what's the PID?
Thank you!


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[Move'n Up]

No I'm not aware of any way to do so.

That 5V circuit connects to the APP 1 Sensor, EGR valve sensor, Fuel Rail Pressure sensor and Oil Pressure sensor.
You Need to unplug each 3 wire sensor ONE AT A TIME , then see if your 5V line comes back steady when the ignition is switched on (don't try to start).