Powertrain, generic (extended)

P2588 Turbocharger Boost Control Position Sensor B Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2588 is stored when the voltage from position sensor B of the second boost actuator drops below the lowest value a working sensor can deliver - most often a grounded signal line or a missing 5 V reference. No manufacturer documents P2588 publicly; the thresholds known for sensor A give the order of magnitude. Ford's 2023 diesel OBD summary flags P2564 below 0.15 V, and GM's 2009 Duramax table uses 0.277 V for 1 s once the engine has run 3 s. A shorted reference may also upset other sensors on the same supply. P2589 is the high-side fault, P2587 a position error with a usable signal, and P2564 the same low fault on sensor A. Power is normally reduced.

Likely causes

Signal wire of position sensor B shorted to ground
Lost or shorted 5 V reference supply
Failed position sensor B in actuator B

Symptoms

  • Malfunction indicator lamp on
  • Power reduced, boost held low
  • Further sensor codes if a shared reference is shorted

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

turbo actuator position sensor bsensor wiring

Related codes

P2586P2587P2589P2590P2564

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.