P0035 Turbocharger Bypass Valve Control Circuit High Signal

P0035 Turbocharger Bypass Valve Control Circuit High Signal

OBD-II DTC Datasheet

Turbocharger Bypass Valve Control Circuit High Signal

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic OBD-II transmission code. It is considered universal as it applies to all makes and models of vehicles (1996 and newer), although the specific repair steps may differ depending on the make and model.

Owners of these brands may include, but are not limited to, VW, Dodge, Saab, Pontiac, Ford, GM, etc.

When I find this code stored in a turbocharged vehicle, I know that the powertrain control module (PCM) has detected a malfunction in the turbocharger boost pressure wastegate control circuit. This electronically controlled valve is designed to relieve excessive turbocharger boost pressure. This code specifically indicates that a high boost condition or high boost pressure bypass valve circuit voltage has been detected.

While the boost controller is sometimes a stand-alone module, more often it is an integrated part of the PCM. The turbocharger boost controller (as the name suggests) is designed to calculate input from various engine and transmission sensors and use the calculations to determine how much boost pressure is required to run the engine at optimal levels at any given time or circumstance. Then the boost pressure control valve opens or closes when commanded by the PCM. If the desired boost pressure does not match the actual boost pressure (as adjusted by the PCM), the turbocharger wastegate control circuit code will be stored high and the service engine lamp may soon come on. The electronically controlled turbo bypass control valves are monitored via a signal circuit to the PCM. A high turbocharger wastegate control circuit code will be stored if the signal voltage falls below the programmed range for an unacceptable period of time.

The turbo bypass control valve, which is powered by a small electric motor, is the norm for most OBD-II equipped vehicles. However, there are several manufacturers that still use vacuum operated valves. The electronic valves are controlled directly by the voltage signal from the PCM; Vacuum operated valves are controlled by a vacuum control solenoid valve (or vacuum valve). The electromagnetic vacuum service solenoid is normally supplied with constant engine vacuum. The voltage signal from the PCM initiates the opening (and closing) of the solenoid to permit or limit the valve vacuum as needed. Always refer to the service manual (or equivalent) for your vehicle (turbocharger bypass control system specifications) before diagnosing.

Since the conditions for this code to persist could result in serious engine damage due to excessive or insufficient turbocharger boost pressure, this type of code should be checked at the earliest opportunity.

symptoms

Symptoms of a P0035 engine code may include:

• Excessive engine and / or transmission temperature
• Random noises from the turbocharger wastegate and / or hoses
• Reduced engine power
• Black smoke from the exhaust system
• Other codes related to turbocharger boost, engine misfire codes, or knock sensor codes may also be stored.
• Spark plugs can be dirty.
• Higher engine temperatures can also cause cylinder detonation.

reasons

Possible causes for this P0035 code include:

• A defective boost pressure sensor is possibly the most common cause of a stored high turbocharger wastegate control circuit code.
• Turbocharger bypass valve malfunction
• Broken, disconnected or split vacuum lines (applicable for vacuum operated bypass valves)
• Turbocharger wastegate actuator problems
• Short circuit or open in the turbocharger bypass control sensor circuit
• • Loose, corroded or disconnected electrical wires / connectors in the turbocharger / boost pressure sensor bypass reference circuit.
• Bad PCM or boost controller

Diagnostic and repair procedures

A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.

Typically the boost pressure is between nine and fourteen pounds, which is programmed for most turbocharger boost controllers. To maintain an acceptable turbocharger boost pressure, the boost pressure bypass control valve opens and closes to a certain extent (via an electrical signal from the PCM).

I usually start by inspecting all the wiring and vacuum hoses associated with the turbocharger and boost control system when I try to diagnose this code.

You can continue to read and write all stored DTCs and snapshot data, and then clear the codes from the system. If the code does not reset, then you know that it is unstable. Some vehicles will place the boost pressure bypass valve in the fully open position when this type of code persists; clearing the stored codes will also allow the system to return to normal operating mode before starting the physical test.

• System controllers and components can be damaged if you do not disconnect them from the system circuitry prior to checking continuity with a digital volt / ohm meter (DVOM).
• Often, the boost control valve turns out to be erroneous when the boost pressure sensor is actually a faulty part.
• Extensive testing of individual system circuits and components will prevent misdiagnosis that could lead to unnecessary component replacement.
• To ensure that the voltage and continuity of the system are within the manufacturer's specifications, I usually use (DVOM) for testing. A system connection diagram or manufacturer's service manual (with diagnostic block diagrams) is indispensable.

Related DTC discussions

• 2005 Mercury Mariner 3.0 L P0351, P0353, P00354Replaced these 3 coils. No codes after. The engine still runs intermittently. The coil is deactivated in position D and does not affect the operating condition. When the coils were disconnected in positions E and F, the motor became rougher. After disabling the coded codes again P0351, P0353, P0354 primary / secondary circuit ... 
• P0035 Turbosmart 2018 F150 EcoBoost Purge ValveHi I have installed a turbosmart purge valve on my 2018 f150 3.5 ecoboost and everything was perfect in summer, but in winter my engine caught fire with code P0035 Does anyone know how to fix this issue please? Thanks… 
• 2001 BMW X5 - P0035BMW X2001 5 3.0, Mileage: 125k I have a check engine light on and an error code "P0035 - Turbocharger Wastegate Control Circuit High". I haven't been able to figure out what this means - can anyone help with this code? I recently replaced all the O2 sensors on the car and cleaned... 

Need more help with your p0035 code?

If you still need help with DTC P0035, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.