Fault code P0035 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0035 – Turbo Charger Bypass Valve Control Circuit High

P0035: Causes, signs and repairs

Error code P0035 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the turbocharger bypass valve control circuit. This DTC P0035 indicates a problem with the turbocharger bypass valve or its control system. For various manufacturers, this fault code may also be referred to as "Turbocharger Bypass Valve Control Circuit".

What causes can this error code have?

Defective turbocharger bypass valve
Damaged cable connections to the bypass valve
Loose or corroded plug connections
Defective engine control unit (ECU)
Vacuum hose leaks
Mechanical blockage of the bypass valve
Electrical short circuit in the control circuit
Defective position sensor on the bypass valve

Which symptoms occur in parallel with error code P0035?

Loss of power: Significantly reduced engine power, especially at higher engine speeds
Poor acceleration: The vehicle accelerates sluggishly or jerkily
Irregular idling: Engine runs unevenly at idle speed
Increased fuel consumption: Noticeably higher consumption than usual
Whistling noises: Unusual noises from the engine compartment
Black smoke: Dark exhaust emissions, especially when accelerating

How to fix the problem of error code P0035?

The repair requires a systematic diagnosis of the turbocharger bypass system.
Replace the defective turbocharger bypass valve completely and then carry out a functional test
Repair or replace damaged cable connections to the bypass valve and insulate all connections properly
Clean all plug connections thoroughly, treat them with contact spray and ensure that they are firmly seated
Check all vacuum hoses for cracks or leaks and replace damaged hoses completely
Carry out an ECU diagnosis and update the engine control software if necessary
Clean the bypass valve mechanically to remove deposits or replace it if irreparably damaged
Measure the electrical values in the control circuit and repair short circuits or interruptions

FAQ - Frequently asked questions about DTC P0035

Can I continue driving with error code P0035?

Short journeys are possible, but you should have the problem rectified as soon as possible. The turbocharger can suffer damage if the bypass valve is not working properly.

How much does it cost to repair error code P0035?

The costs vary between 150-800 euros, depending on the cause. A new bypass valve costs around 200-400 euros, cable repairs are cheaper at 80-150 euros.

How do I recognize a defective turbocharger bypass valve on P0035?

Typical signs are loss of power, whistling noises and irregular engine running. A professional diagnosis with an OBD scanner confirms the defect.

Can I repair fault code P0035 myself?

Simple work such as cleaning the plug connections is possible. However, replacing the bypass valve requires specialist knowledge and should be carried out in a workshop.

How long does it take to repair error code P0035?

Depending on the cause, the repair takes 1-4 hours. Simple cable repairs are completed more quickly, replacing the valve takes longer.

Does error code P0035 reappear after the repair?

If the repair is carried out correctly, the code will not normally reappear. Regular maintenance of the turbocharger prevents recurring problems.

Vehicles in which error code P0035 occurs most frequently

Error code P0035 is a turbocharger-specific trouble code and can occur in all vehicles with turbocharging, but is most common in the following vehicles:

Audi: A3, A4, A6, Q5, TT (2008-2018)
BMW: 1 Series, 3 Series, 5 Series, X1, X3 (2010-2019)
Ford: Focus, Mondeo, Kuga, EcoBoost models (2012-2020)
Mercedes-Benz: A-Class, C-Class, E-Class, GLA (2014-2021)
Volkswagen: Golf, Passat, Tiguan, Touran (2009-2019)
Peugeot: 308, 508, 3008, 5008 (2011-2020)
Renault: Megane, Scenic, Kadjar (2013-2021)
Opel: Astra, Insignia, Mokka (2012-2019)
If code P0035 occurs in your vehicle, you should first check the plug connections and vacuum hoses before replacing the bypass valve. A professional EOBD diagnosis can help to identify the exact cause and avoid unnecessary repair costs.

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