Powertrain, generic (extended)

P2599 Turbocharger Boost Control Position Sensor A Performance - Stuck High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2599 is the high-side stuck fault for position sensor A: the turbocharger actuator stays at, or reports, a position beyond where it should be, while the sensor circuit itself works. GM documents it twice. On the 2014 Cruze 2.0 L diesel the ECM compares commanded and actual vane position and logs P2599 when the deviation runs past 10 % in the direction opposite to P2598 for 10 s. The 2018 table for GM's smaller diesels checks instead whether the vanes spring back to their fully open rest position once the actuator is released after a P0046; if the reading stays above 15 % (vacuum actuator) or 5 % (smart actuator), the code sets at once as Type A. GM bulletin PI1260 names vacuum leaks as a cause. P2598 is the low-side partner; wiring faults use P2562-P2566.

Likely causes

Vanes or wastegate stuck toward the closed position by soot or corrosion

Weak return spring or binding linkage that keeps the actuator from its rest position

Vacuum control solenoid or hose fault on pneumatic actuators

Defective actuator electronics on smart actuators

Symptoms

Engine warning lamp on
Overboost cut-out or noticeable power reduction
Black smoke or rough response under load

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

P2598 P259B P2563 P0046 P0234

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