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Diagnose/P0728
P0728High SeverityTransmission

Engine Speed Input Circuit High Input

What This Means

The engine speed input signal to the transmission controller voltage is above maximum threshold. This signal is critical for proper shift timing and gear ratio calculations.

Common Symptoms

  • Shift timing issues
  • Harsh shifts
  • Limp mode possible
  • Check engine light on

Common Causes

  • Signal circuit fault
  • Wiring damage
  • PCM output issue
  • TCM input failure
  • Connector problem

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.