Critical Safety risk Powertrain-code

P0035

P0035 Turbo Charger Bypass Valve Control Circuit High

P0035 Turbo Charger Bypass Valve Control Circuit High

Pull over safely and book service immediately

This code is flagged as a safety risk and rated Critical. Avoid driving until a technician has inspected the vehicle.

Symptoms

  • Increased engine and/or transmission temperatures
  • Random noises from the turbocharger wastegate and/or hoses
  • Reduced engine performance
  • Black smoke from the exhaust system
  • Other turbocharger boost related codes, engine misfire codes, or knock sensor codes may also be stored
  • The spark plugs may be fouled
  • Hotter engine temperatures may also lead to cylinder detonation

Likely causes

  • A defective boost pressure sensor is possibly the most common cause of a stored turbocharger bypass valve control circuit high code
  • Turbocharger bypass valve failure
  • Collapsed, disconnected, or split vacuum lines (applicable for vacuum actuated bypass valves)
  • Turbocharger bypass valve actuator problems
  • A shorted or open circuit in the turbocharger bypass control sensor circuit
  • • Loose, corroded, or disconnected electrical wiring/connectors in the turbocharger bypass control/boost pressure sensor reference circuit
  • A bad PCM or boost controller

Repair approach

  1. 1 System controllers and components may be damaged if you fail to disconnect them from system circuitry prior to testing continuity with a digital volt/ohmmeter (DVOM)
  2. 2 Frequently, the boost control valve is condemned in error when the boost pressure sensor is actually the defective part
  3. 3 Exhaustive testing for individual system circuits and components will prevent misdiagnosis that may lead to unnecessary component replacement
  4. 4 To ensure that that system circuit voltage and continuity are within manufacturer’s specifications, I normally use a (DVOM) for testing. A system wiring diagram or manufacturer’s service manual (with diagnostic flow charts) will be indispensable
Labor estimate
2h typical
Range: 1h – 4h
Parts cost
$0 – $500
Range varies by year/make/model

Information shown is reference-grade and may vary by vehicle. Always have a qualified technician confirm the cause before any repair.