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Diagnose/P0503
P0503Medium SeverityEngine

Vehicle Speed Sensor High Input

What This Means

The vehicle speed sensor (VSS) voltage is above maximum threshold. This sensor provides critical information for speedometer, transmission shifting, cruise control, and ABS operation.

Common Symptoms

  • Speedometer not working or erratic
  • Transmission shifts erratically
  • Cruise control won't engage
  • ABS light may come on

Common Causes

  • Failed vehicle speed sensor
  • Damaged wiring or connector
  • Faulty instrument cluster
  • Transmission output shaft issue
  • PCM input circuit failure

Estimated Repair Cost

$100 – $400
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.