P259A
Turbocharger Boost Control Position Sensor B Performance - Stuck Low
Same condition as the A-side stuck-low fault, but on the second sensor / second turbo. Position sensor B reads stuck near the low end while the actuator is commanded.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
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.
- Actuator mechanically stuck near low endCommon
Parts involved
- Turbo Actuator Position Sensor B
- Turbo Actuator B
P259A 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.