P2015
PowertrainIntake Manifold Runner Position Sensor / Switch Circuit Range/Performance Bank 1
The intake manifold runner position sensor or switch circuit has a fault. Modern engines often have flap valves inside the intake manifold that change runner length or close off cylinders for low-load efficiency, this sensor reports their position back to the ECU. P2015 means that position feedback isn't working correctly.
ⓘ Information only. This page provides general educational information about fault code P2015. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does P2015 mean?
P2015 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Intake Manifold Runner Position Sensor / Switch Circuit Range/Performance Bank 1.
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms commonly associated with this code
Symptoms that drivers often report alongside this code. Not all may apply to every case:
- • Engine warning light
- • Rough idle, sometimes with a hesitation or stumble at low revs
- • Reduced power, particularly noticeable from low rpm
- • Worse fuel economy
- • On VAG TDIs and BMW diesels especially: limp mode if the manifold flaps have physically broken
- • Sometimes a faint metallic rattle from the intake manifold area at idle
Possible causes
Causes commonly associated with P2015, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Failed manifold flap actuator motor (the small electric motor that drives the flaps)
- 2. Manifold flaps physically broken or seized from carbon buildup, common on VAG TDI engines from 2007-2012
- 3. Failed position sensor reading inaccurately or with no signal
- 4. Wiring damage at the actuator connector, often from heat exposure
- 5. Connector corroded or backed out
- 6. On some BMW diesels: the intake manifold itself fails internally and needs full replacement
How mechanics typically diagnose
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training.
- 1. Visual inspect the actuator and connector for damage, oil contamination, or corrosion
- 2. Test the actuator motor electrically against spec, resistance and operation should match manufacturer values
- 3. Read live data on flap position commanded vs actual; the flaps should respond predictably to commands
- 4. Listen at the manifold for any rattling at idle that suggests the flaps are loose or broken inside
- 5. On VAG TDI, this is a known issue, the manifold can usually be replaced as a unit with cleaned or new flaps; specialist independent diesel garages often have refurbished units cheaper than dealer parts
Common questions about P2015
Why is this so common on VAG TDIs? +
The intake manifold on common-rail TDI 2.0 engines from around 2007-2012 has plastic swirl flaps inside that, over time, get coated in carbon and oil residue from the EGR system. The flaps can stick, break off, and even drop into the cylinders in worst cases. It's well-documented and most VAG diesel specialists have seen hundreds of them. Don't ignore the warning, broken flaps falling into the engine cause catastrophic damage.
Can I just disable the flaps? +
Some tuners offer 'swirl flap deletes', which physically remove the flaps and modify the ECU map to ignore them. Whether this is technically legal varies, MOT failure if your test centre checks emissions strictly. The bigger risk is removing them changes low-speed running behaviour, the flaps exist for a reason. Cleaning or replacing is the cleaner solution.
How urgent is this? +
Medium urgency on most cars. Drivability is fine in the short term but worsens over weeks. On VAG TDIs particularly, get it diagnosed promptly; broken flaps falling into the engine are catastrophic.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →