P2B7F
Turbocharger/Supercharger Boost Control Module A Calibration Not Learned/Programmed
The boost control module A reports that its calibration data is not present or not learned. Boost regulation falls back to default values until programming or adaptation completes.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
Ordered by how often each turns out to be the cause.
- Module replaced without programmingCommon
- Calibration memory corrupted after voltage dropPossible
Parts involved
- Boost Control Module A
- ECM
P2B7F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.