Description of DTC code P0651

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

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

Causes of OBD2 P0651

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

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.

Codes related to P0651

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