P2587
Turbocharger Boost Control Position Sensor B Circuit Range/Performance
Position sensor B is electrically intact, but the reading does not track sensor A or the actuator-command model. Often a misaligned redundant sensor or aged element on a second turbo.
- 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.
- Sensor mounting misaligned after serviceCommon
- Aged Hall elementPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Turbo Actuator Position Sensor B
- Turbocharger
P2587 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.