OBD Guide
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P0039

Turbocharger/Supercharger Bypass Valve A Control Circuit Range/Performance

P0039 is an OBD-II diagnostic trouble code meaning: Turbocharger/Supercharger Bypass Valve A Control Circuit Range/Performance. Common causes: bypass valve actuator malfunction, damage to the wiring to the actuator. Estimated repair cost: $89–278.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$89–278 (est.)

Symptoms

  • Reduced engine power
  • Increased fuel consumption
  • Unstable operation at idle
  • Black smoke from the exhaust pipe
  • Whistling or unusual noises from the turbine
  • Check Engine Light Illuminates
  • Jerks when accelerating

Causes

  • Bypass valve actuator malfunction
  • Damage to the wiring to the actuator
  • Oxidation or corrosion of connectors
  • Bypass valve stuck
  • Rupture of vacuum hoses (for pneumatic systems)
  • Valve position sensor malfunction
  • Valve contaminated with carbon or oil
  • Valve mechanism wear

How to Fix

  1. Connect a diagnostic scanner and read all error codes
  2. Check the integrity of the wiring to the bypass valve actuator
  3. Inspect connectors for corrosion and oxidation
  4. Check the operation of the actuator using a multimeter
  5. Test the bypass valve for sticking
  6. Clean the valve from carbon deposits and dirt.
  7. If necessary, replace the actuator or the valve itself
  8. Check vacuum hoses and connections
  9. Clear error codes and test drive
  10. Recheck the system with a diagnostic scanner

Related codes

P0034P0035P0036P0037P0038P0040P0041P0042

Error P0039 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0039 code mean?

P0039 is an OBD-II diagnostic trouble code that indicates: Turbocharger/Supercharger Bypass Valve A Control Circuit Range/Performance

What causes a P0039 error code?

The most common causes of P0039 include: Bypass valve actuator malfunction; Damage to the wiring to the actuator; Oxidation or corrosion of connectors; Bypass valve stuck.

How do I fix a P0039 diagnostic trouble code?

To fix P0039: Connect a diagnostic scanner and read all error codes. Check the integrity of the wiring to the bypass valve actuator. Inspect connectors for corrosion and oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0039?

Do not drive — repair immediately

How much does it cost to fix P0039?

The estimated repair cost for P0039 is $89–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat