Toyota Trouble code P0035 Turbocharger/ Supercharger Bypass Valve Control Circuit High This diagnostic trouble code  is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may vary depending on the make and model. This code, in particular, indicates that a high boost condition or high boost pressure bypass valve circuit voltage has been detected.  This electronically controlled valve is designed to relieve excessive turbocharger boost pressure. The boost pressure control valve is then opened or closed as commanded by the PCM. If the desired boost pressure fails to coincide with actual boost pressure a turbocharger bypass valve control circuit high code will be stored and a service engine soon lamp may be illuminated. Turbo bypass control valves, which are electronically controlled, are monitored through a signal circuit to the PCM. Electronic valves are controlled directly by a voltage signal from the PCM; vacuum actuated valves are controlled using a vacuum control  solenoid. The vacuum service solenoid is typically supplied with constant engine vacuum. A voltage signal from the PCM initiates opening  of the solenoid to allow or restrict vacuum to the valve as required. Always consult the service manual for your vehicle  before attempting diagnosis. Toyota Trouble code P0035 Turbocharger/ Supercharger Bypass Valve Control Circuit High   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  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 Diagnostic and Repair Procedures A good starting point is always to check for technical service bulletins  for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis. Somewhere between nine and fourteen-pounds of boost pressure is typically the figure that most turbocharger boost controllers are programmed to effect. In order to maintain an acceptable degree of turbocharger boost pressure, the boost pressure bypass control valve is opened and closed to a calculated degree. I generally start with an inspection of all wiring and vacuum hoses related to the turbocharger and boost control system when attempting to diagnosis this code.