Powertrain, generic (extended)

P2B7F Turbocharger/Supercharger Boost Control Module A Calibration Not Learned/Programmed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

New or used module or charger fitted without programming or learn routine
Programming aborted, for example by low battery voltage
Module has lost its stored calibration (internal fault)

Symptoms

  • Warning lamp right after a repair on the turbo system
  • Reduced boost or emergency mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–400
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

boost control module aecm

Related codes

P2B80P0045P003AP2563

References: law.cornell.edu, patents.google.com, melett.com.