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Diagnose/P0490
P0490Low SeverityEmissions

Exhaust Gas Recirculation Control Circuit A Open

What This Means

The exhaust gas recirculation control circuit a open has been detected by the engine computer. This affects the emission control system and may cause increased tailpipe emissions.

Common Symptoms

  • Check engine light on
  • Failed emissions test
  • No driveability change
  • Diagnostic code stored

Common Causes

  • Faulty emission control valve
  • Wiring damage
  • Relay or fuse failure
  • Connector corrosion
  • PCM circuit issue

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.