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What Does P0642 Code Mean?

OBD-II Code P0642 is defined as a Sensor Reference Voltage "A" Circuit Low

The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an incorrect output signal, it will set code P0642.

P0642 Symptoms

  • Engine may not start

Common Problems That Trigger the P0642 Code

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