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Diagnose/P2138
P2138Critical SeverityEngine

Throttle Position Sensor D/E Voltage Correlation

What This Means

The accelerator pedal position sensors are providing conflicting signals. Like the throttle body, the accelerator pedal uses dual sensors for safety redundancy.

Common Symptoms

  • Reduced power mode / limp mode
  • Accelerator feels unresponsive
  • Vehicle barely moves
  • Warning lights on dashboard

Common Causes

  • Faulty accelerator pedal position sensor
  • Wiring issue to pedal sensor
  • Corroded connector
  • Floor mat interfering with pedal
  • PCM input circuit fault

Estimated Repair Cost

$150 – $600
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.