Error code

OBD2 P0039

OBD2P0039
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Turbo/Super Charger Bypass Valve Control Circuit Range/Performance.

Severity

moderateCan be driven but performance issues may occur if the vehicle is pushed hard.

Summary

P0039 indicates an issue with the turbocharger or supercharger bypass valve control circuit range/performance, affecting how the engine manages boost pressure.

Symptoms

  • Loss of performance
  • Strange noises from the turbocharger
  • Detonation and cylinder misfires

Common Causes

  • BCS (Boost Control Solenoid) failure
  • Electrical problems such as open circuits, short circuits, loose connections, or corrosion

Diagnosis

  1. Check the fuse and wire harness between the ECM and BCS
  2. Unplug the BCS and check for resistance across terminals (10 Ω to 25 Ω)
  3. Perform a circuit check by unplugging the ECM and BCS, checking continuity and short circuits

Fixes

  • Replace faulty components such as the BCS or repair damaged wiring

FAQ

What should I do if my car has P0039?

It's recommended to check for electrical issues and replace any faulty parts like the Boost Control Solenoid (BCS).

Can I drive with P0039?

You can drive but performance may be affected, especially under hard acceleration.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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