P0651 - SENSOR REFERENCE VOLTAGE B CIRCUIT OPEN

POST UPDATED IN September, 2021

Description of DTC code P0651 Generic

OBDII DTC P0651 indicates that the vehicle’s computer has detected an open circuit on a particular sensor which is designated “B”. When the circuit is open, it may also indicate that it is absent. This sensor is associated with the automatic transmission or a differential. It is usually accompanied by another specific sensor code. This code indicates is that the circuit is open.

The reference voltage, which is usually 5 volts, is applied to the sensor via a switched circuit, plus a ground signal. Its resistance may be variable depending on the conditions to complete a circuit and provide the Powertrain Control Module (PCM) with an input voltage signal. If the PCM does not receive such a voltage signal, it is considered an open circuit.

Symptoms of fault code P0651 Generic

  • Illuminated check engine light.
  • Transmission malfunctions when shifting.
  • Transmission malfunction.
  • Malfunctioning speedometer.

Causes of OBD2 P0651 Generic

Reasons for setting the P0651 OBD2 diagnostic code:

  • The circuit may be open or a bad condition of the wires or connectors.
  • There may be blown fuses.
  • The system power relay may be faulty.
  • The sensor may be faulty.

Possible solutions of the DTC code P0651 Generic

To troubleshoot the P0651 OBDII fault code, consider the following:

  • Use the vehicle information source to determine both the location and function of the sensor. Then, inspect the fuses and their links to the fully loaded circuit. Replace blown fuses.
  • Check the system wiring and connectors for damage. Replace if necessary.
  • By using a multimeter, test the reference voltage and ground signal for the sensor. Also check the resistance, circuit, and continuity between the sensor and the PCM. Make the respective adjustments.

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