P2B7FTurbocharger/Supercharger Boost Control Module A Calibration Not Learned/Programmed
- 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
- P2B7F applies where boost control A is handled by its own electronic module, typically a smart actuator on the charger, and that module reports missing or invalid calibration data. Honeywell patent US7689376B2 describes such a controller holding a multi-point calibration measured for its individual turbocharger, and Melett notes for REA-type actuators that this data is unique to each unit, so swapped or new parts must be programmed or matched. The code therefore mostly appears after a module or charger replacement or an interrupted programming session. CARB 13 CCR 1968.2 lists turbocharger electronics as monitored parts and requires a CAL ID from reprogrammable emission-critical modules. No manufacturer documents P2B7F publicly. Module B uses P2B80.
- What you may notice
- Warning lamp right after a repair on the turbo system
- Reduced boost or emergency mode
- Likely causes
- LikelyNew or used module or charger fitted without programming or learn routine
- PossibleProgramming aborted, for example by low battery voltage
- RareModule has lost its stored calibration (internal fault)
- 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: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.