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Diagnose/P0538
P0538Low SeverityEngine

A/C Evaporator Temperature Sensor Circuit High Input

What This Means

The A/C evaporator temperature sensor voltage is above maximum threshold. This sensor prevents the evaporator from freezing by monitoring its temperature.

Common Symptoms

  • A/C ices up
  • Inconsistent cooling
  • No A/C operation
  • Check engine light on

Common Causes

  • Faulty evaporator temp sensor
  • Wiring issue
  • Connector corrosion
  • Frozen evaporator
  • PCM circuit failure

Estimated Repair Cost

$75 – $350
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

Need This Fixed?

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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.