P063A OBD II Trouble Code Generator Voltage Sense Circuit

How to quickly diagnose and repair, and causes of a P063A electrical code that indicates a detected malfunction within the generator voltage sense circuit.

Symptoms of P063A OBD II Trouble Code

  • Battery warning lamp illuminated
  • The engine will not start
  • The engine will crank over slower than normal
  • Check engine light illuminated

Common Causes of P063A OBD II Trouble Code

  • Faulty alternator
  • Defective voltage regulator
  • Loose or damaged serpentine belt
  • Defective serpentine belt tensioner
  • Blown fuse or fuse-able link (if applicable)
  • Corroded or damaged connector
  • Corroded or damaged battery cable
  • Faulty or damaged wiring
  • Faulty PCM
  • Defective battery

Severity of P063A OBD II Trouble Code

The severity of this code can vary tremendously from just an illuminated check engine light or battery warning light on a vehicle that starts and runs to an automobile that will not start at all.