P2B80
Turbocharger/Supercharger Boost Control Module B Calibration Not Learned/Programmed
The boost control module B 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 B
- ECM
P2B80 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.