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OBD II Fault Code

  • OBD II P063A

OBD-II Code Engine may not start is defined as a Generator Voltage Sense Circuit

The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P063A.

Engine may not start Symptoms

  • Engine may not start
  • Engine may stall

Common Problems That Trigger the P063A Code

  • Alternator failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue

Common Repairs Needed for the P063A Code

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