P2590
Turbocharger Boost Control Position Sensor B Circuit Intermittent/Erratic
Position sensor B signal jumps or drops out — vibration on the actuator, oil mist contamination or chafed wiring near the hot 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.
- Vibration-induced chafing of the harnessCommon
- Oil mist on the sensorPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Turbo Actuator Position Sensor B
- Sensor Wiring
P2590 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.