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Diagnose/P0039
P0039Medium SeverityEngine

Turbo/Supercharger Bypass Valve Control Circuit Range/Performance

What This Means

The turbocharger bypass valve is operating but not within the expected performance range. The valve may be sticking or responding too slowly.

Common Symptoms

  • Inconsistent boost pressure
  • Power fluctuations
  • Turbo lag or surge
  • Check engine light on

Common Causes

  • Sticking bypass valve
  • Carbon buildup on valve
  • Weak vacuum actuator
  • Boost pressure sensor error
  • Partially blocked vacuum line

Estimated Repair Cost

$150 – $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.