P2B93Wastegate Position Sensor A 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
- P2B93 concerns the learned closed position of electric wastegate A. The computer periodically drives the valve onto its seat and stores the sensor value found there; Ford's patent US9243553B2 explains why: linkage length drifts with temperature and the reference must be refreshed. GM documents the code for the 2.7L L3B (19OBDG03D) and in the 2025 table 25OBDG03B: it fails when the raw closed position learned is above 85 %, or when no valid closed position has ever been learned while the engine runs above 1000 rpm with a stable valve and coolant at least 80 degrees Celsius. It is Type A with one trip. The usual reasons are a worn seat, a bent or stretched linkage or a replaced charger not yet adapted; this differs from P2B81, which judges how the valve follows.
- What you may notice
- MIL in the first trip
- Boost slightly low because the valve does not fully close
- Likely causes
- LikelyWastegate linkage bent, stretched or wrongly adjusted
- PossibleWastegate flap or seat worn so the valve travels too far
- PossibleTurbocharger or actuator replaced and relearn not completed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.