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P2586

Turbocharger Boost Control Position Sensor B Circuit

General electrical fault on the turbocharger boost control position sensor B — second position sensor on the same actuator (redundant Hall) or on a second turbo (twin-turbo, sequential or two-stage). With B invalid the ECM cannot cross-check actuator A and falls back to limited boost control.

  • 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.

  • Open or shorted wiring to the position sensorCommon
  • Failed Hall elementPossible

Parts involved

  • Turbo Actuator Position Sensor B
  • Sensor Wiring

P2586 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.