On Chevy Colorado 2006 what is Code P0641 mean

Question

Code reader says P0641 reference voltage "A" is open. Where does 5 volts come from: source

Answer 1

P0641 5 volts refference circuit

The source is from the ECM which supplys a 5 volts to the throttle position sensor, the (APP) accelerator pedal position sensor 2,the a/c pressure sensor ,the fuel tank pressure sensor