Turbo and forced inductionGeneric OBD-II codeUrgency: Garage soon
Code P2261: turbo bypass valve: mechanical fault
What code P2261 means
The ECU has detected an incorrect signal from the turbo or supercharger bypass valve, the one that diverts excess pressure when you lift off the accelerator. It applies to turbocharged or supercharged cars.[1]
It is a generic code, but its definition may vary depending on the manufacturer, and there is not much public information about it.[1]
Original definition (SAE J2012): Turbocharger/Supercharger Bypass Valve - Mechanical[1]
Causes of P2261
From most to least likely, according to the sources.
Symptoms
- Engine warning light on.[1][2]Engine warning light: faults that cause it
- The car may go into limp mode and limit power.[1]Limp mode: faults that cause it
- Low turbo pressure and loss of power when accelerating.[1][2]Less power: faults that cause it
- Abnormal turbo noise during operation.[2]Turbo whistle: faults that cause it
- Higher fuel consumption and uneven revs.[2]Uses more fuel: faults that cause it
How to diagnose P2261
In order: from the most likely and cheapest to check to the most expensive.
- 1Read all the codes: it may appear alongside other boost pressure codes, which give additional symptoms.[1]
- 2Do not assume the valve has to be replaced just because of the code: sometimes replacing a vacuum pipe is enough.[1]
- 3Inspect the vacuum hoses and pipes, and the valve's wiring and connector.[1][2]
- 4Check the valve's solenoid and the boost pressure sensor.[2]
- 5Look up the procedure specific to your car in a repair database, because general information is limited.[1]
Can I keep driving with P2261?
Garage soon
The car may go into limp mode with limited power. The sources say nothing more specific, so take it to a garage without delay.[1]
Documented faults related to P2261
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Turbo: the most serious faults by engine and car
- High severityFrequency: Very frequent1.6 HDiTurbo failure through lack of lubrication (carbon deposits and union filter)On the 16-valve 1.6 HDi/TDCi engines (2004-2011) the turbo can seize because carbon deposits from the oil clog the mesh filter in the union that feeds it. It is a serious, repeat fault: if only the turbo is replaced without cleaning the circuit, it fails again.Repair (garage): €700–€1,050
- High severityFrequency: Very frequent2.0 Ingenium diéselTurbocharger failureYes: according to several sources, the turbo is the component that causes the most faults on the 2.0 Ingenium diesel. It fails across a very wide mileage range (from around 35,000 to over 140,000 km) and, if it breaks up inside, it can send oil or metal into the engine and destroy it.Repair (garage): €2,600–€3,000Appears at around 35,000 km
- High severityFrequency: CommonBMW N47Turbo and wastegate valve failureThe N47's turbo does not usually fail from general wear, but because of failure of the wastegate valve, which regulates boost and can seize or lose adjustment, sending fuel consumption soaring; oil leaks from the turbo itself are also common.Repair (garage): €900–€1,800
- High severityFrequency: CommonOM651Variable-geometry turbo failure and its pneumatic actuatorThe OM651's variable-geometry turbo tends to fail at the pneumatic actuator (cracks, loss of calibration) before the turbo itself. Symptoms range from a gradual loss of power to permanent limp mode, with whistling or smoke if the problem progresses.Repair (garage): €500–€3,000
Frequently asked questions
What does the turbo bypass valve do?
It diverts excess boost pressure when you lift off the accelerator, to protect the turbo and the intake system.[1]
Does the valve have to be replaced?
Not necessarily. Sometimes replacing a vacuum hose is enough; on some cars, cases have been resolved by replacing the valve's solenoid or the wastegate control solenoid.[1]
Can I drive with P2261?
You can get to a garage, but the car may limit power. Do not push the engine.[1]
How much does it cost to fix?
CarWiki estimates €150-300 for replacing the valve and €50-150 for repairing vacuum hoses, as a reference in Germany; the real cost depends on the car.[2]
Will I pass the MOT with code P2261?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[3]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- P2261: Turbocharger/Supercharger Bypass Valve (Mechanical)CarParts.com · Technical documentation · consulted 29 October 2026
- OBD DTC Fehlercode P2261CarWiki · Technical documentation · consulted 29 October 2026 · in German
- Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish