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DTC P0651 Sensor Reference Voltage "B" Circuit/Open DTC P0651 Circuit Description The engine control module (ECM) provides 5-volts to the following sensors: The boost sensor The accelerator pedal position (APP) sensor 2 The exhaust gas recirculation (EGR) vacuum sensor, if applicable. The barometric pressure (BARO) sensor. The air conditioning (A/C) refrigerant pressure

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Q: What is does the code P0651 reads on a 2003 Gmc Sierra?
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