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OBD II Fault Code

  • OBD II P0643

OBD-II Code Engine may not start is defined as a Sensor Reference Voltage "A" Circuit High

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 P0643.

Engine may not start Symptoms

  • Engine may not start

Common Problems That Trigger the P0643 Code

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