P0651 Code - Sensor Reference Voltage 'B' Circuit/Open

Discussion in 'P - Powetrain Codes' started by fault code, Jan 30, 2018.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0651 Mean?

    This code indicates that a fault has been detected in the sensor reference voltage “B” circuit. The PCM or one of the other supporting control modules has detected this fault. These control modules may include (but are not limited to) the alternative fuel control module, the body control module, the antilock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module. The letter “B” isolates a particular area of the circuit more than a particular component or wire.

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    What are the common causes of P0651 ?

    A number of different things could potentially cause the P0651 code. The common causes include:
    • A faulty engine control module (EMC).
    • An open or shorted ECM harness.
    • Poor quality electrical connection in the ECM circuit
    • Shortened sensor on a 5-volt circuit.

    How do you troubleshoot P0651 ?


    If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.



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