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Diagnose/P0123
P0123High SeverityFuel System

Throttle Position Sensor Circuit High Input

What This Means

The Throttle Position Sensor (TPS) voltage is above the maximum expected threshold. The TPS tells the computer how far open the throttle is, which is essential for proper fuel and ignition timing.

Common Symptoms

  • Engine surging or hesitation
  • Sudden idle speed changes
  • Vehicle may enter limp mode
  • Poor throttle response

Common Causes

  • Worn or faulty TPS
  • Damaged wiring or connector
  • Throttle body mechanical issue
  • Poor ground connection
  • Corrosion on sensor contacts

Estimated Repair Cost

$100 – $500
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.