P003ATurbocharger/Supercharger Boost Control A Position Exceeded Learning Limit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The electric boost actuator A positions the variable turbine vanes or the wastegate and reports its position through a sensor. In a learning run, for example with the engine warm at idle or after switching off, the control module drives the actuator to its mechanical end stops and stores the sensor values as reference. P003A is set when a learned end position or the total travel lies outside the permitted limits. Typical reasons are worn or sticking vanes or linkage, a faulty actuator, a broken actuator lever, or a replacement actuator that has not been learned in. A usually denotes the first turbocharger in the exhaust flow.
- What you may notice
- Check engine light on
- Reduced power mode
- Underboost or overboost codes possible
- Sometimes no noticeable symptoms
- Likely causes
- LikelyElectronic actuator or its control module faulty
- PossibleVane mechanism, sector gear or linkage worn or sticking
- PossibleReplacement not learned in, or learning run aborted (e.g. low voltage)
- RareActuator lever broken
- RarePosition sensor or its wiring faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €400 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.