Powertrain, generic (extended)

P2B80 Turbocharger/Supercharger Boost Control Module B Calibration Not Learned/Programmed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2B80 is the counterpart of P2B7F for the second boost control module, which only exists where two chargers or two separately driven actuators each carry their own electronics. It is set when module B has no valid calibration or its learn step was never completed. On twin-charger engines a frequent trap is fitting modules or chargers on the wrong side: Melett points out that REA-style actuator calibration belongs to one specific turbocharger and cannot be moved, and Honeywell patent US7689376B2 shows calibration recorded per unit. CARB 13 CCR 1968.2 ties such reprogrammable modules to CAL ID reporting. No manufacturer documents P2B80 publicly. If both codes appear together, a programming or wiring issue in the engine computer is more likely.

Likely causes

Module B or its charger replaced without programming or learn routine
Modules or chargers fitted on the wrong side
Programming session aborted

Symptoms

  • Warning lamp after work on the second charger
  • Reduced power because boost on one side is limited

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 becm

Related codes

P2B7FP003BP2587

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