Powertrain, generic (extended)

P2598 Turbocharger Boost Control Position Sensor A Performance - Stuck Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2598 means the boost control position of turbocharger A, normally the vane or wastegate position reported by the actuator, appears stuck toward its low end: the measured value no longer follows the command although the signal is electrically valid. Ford's 2023 diesel OBD summary runs this check with closed-loop position control active above 500 rpm and flags a gap of more than 15 % in either direction lasting 25 s, with an extra variant during cold start. GM's 2018 table for its smaller diesels reads it as vanes jammed more open than requested (640 of 800 samples, Type A). GM bulletin PI1260 blames vacuum leaks for it on the 2014 Cruze with the 2.0 L diesel, and 17-NA-301 says a P2598 found at pre-delivery on 2017-2018 Cruze, Equinox and Terrain diesels may just be cleared. P2599 is the high-side partner. Expect reduced power.

Likely causes

Sooted or seized variable vanes that no longer follow the actuator
Vacuum leak or kinked hose on pneumatically driven actuators
Worn or failed electric vane actuator
One-off entry from unusual operation, e.g. after delivery transport

Symptoms

  • Engine warning lamp on
  • Lack of power under load, boost limited
  • Unusual turbo noise

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–2,200
Time0.5–5 h

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

Parts involved

turbo actuator position sensor aturbo actuator

Related codes

P2599P259AP2563P003AP0046

References: fordservicecontent.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.