P0651 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0651 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0651 code.

OBD II Fault Code

• OBD II P0651

OBD-II Code Engine may not start is defined as a Sensor Reference Voltage "B" Circuit/Open

The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an issue with this signal, it will set code P0651.

Engine may not start Symptoms

• Engine may not start

Common Problems That Trigger the P0651 Code

• Engine sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue