P10A4 on Volkswagen: How to Diagnose & Fix
Intake Air Regulating Flap - Mechanical Malfunction
1 Volkswagen model · 1 documented issue · $200-$900 repair
P10A4 on Volkswagen by model: symptoms, diagnosis and fix
The 1.4 TSI 160 PS 'twincharger' (EA111, supercharger + turbo) suffers two related, well-documented faults. The supercharger drive uses a magnetic clutch built into the water pump that can fail to engage, giving a squeak/tick and weak low-rpm boost. Separately the supercharger bypass/changeover valve flap sticks or fails, logging fault code P10A4 and causing a sudden flat spot, loss of low-end power and limp mode, sometimes with the EML on. The 160 PS twincharger is also known for high oil consumption. VW fitted an upgraded water pump/clutch and revised valve on cars from around 2011.
Common Symptoms
- Squeak/tick from supercharger area
- Weak or absent low-rpm boost
- Sudden flat spot / power loss
- Limp mode
- Engine management light
- High oil consumption
How to Fix
For the magnetic-clutch/boost fault, fit the upgraded water-pump-with-supercharger-clutch assembly (post-2011 part). For P10A4, replace the supercharger changeover/bypass valve actuator with the revised part and clear the code. Monitor oil level regularly given the engine's oil-consumption tendency. The non-supercharged 1.4 TSI 122 PS does not have these specific supercharger parts.
Sources for this issue (3)
P10A4 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P10A4 mean on a Volkswagen?
P10A4 stands for "Intake Air Regulating Flap - Mechanical Malfunction." P10A4 is a manufacturer-specific Volkswagen/Audi (VAG) code, defined by the Ross-Tech wiki as "Intake Air Regulating Flap: Mechanical Malfunction" (VAG fault code 004260). It means the engine control module has detected that the intake air regulating/swirl flap in the intake manifold is not moving correctly or its actuator is mechanically stuck or out of position. The fault commonly forces the engine into limp mode, limiting RPM to around 3000 and causing reduced power and hesitation under acceleration. On Volkswagen it is documented across 1 model: Scirocco.
What are the most common causes of P10A4?
The most common causes of P10A4 are: Failed or seized intake air regulating/swirl flap actuator motor in the intake manifold, Carbon buildup or debris jamming the flap mechanism (common on direct-injection TSI/TFSI engines), Disconnected or leaking vacuum line operating the flap (on vacuum-actuated systems), Faulty intake manifold runner control assembly requiring full manifold replacement, Damaged wiring, corroded connector, or poor electrical contact to the flap actuator, On some 3.0L supercharged Audi engines, a faulty Supercharger Control Valve (J808). The specific cause varies by vehicle.
How much does it cost to fix P10A4 on a Volkswagen?
Published repair estimates on Volkswagen range from $200 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P10A4 on a different make?
View P10A4 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.