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Diagnose/P2135
P2135Critical SeverityEngine

Throttle Position Sensor Voltage Correlation

What This Means

The two throttle position sensor signals inside the electronic throttle body do not agree with each other. Modern vehicles use redundant TPS signals for safety, and a mismatch triggers this code.

Common Symptoms

  • Reduced engine power / limp mode
  • Throttle unresponsive
  • Engine may not rev above idle
  • Multiple warning lights

Common Causes

  • Faulty throttle body/TPS assembly
  • Wiring damage to throttle body
  • Corroded throttle body connector
  • Carbon buildup on throttle plate
  • PCM issue

Estimated Repair Cost

$200 – $800
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.