P2599: Turbocharger Boost Control Position Sensor A Performance

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.

Medium severity. Can I keep driving?Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

Check the hoses, clamps, and intercooler
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Compare commanded and actual pressure in live data
Check the actuator's movement
Check the vacuum hoses and the solenoid valve
Check the oil and the turbo shaft play before replacing it

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P2599 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
5: Speed and idle
99: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2599?

Drive without demanding power and go to a repair shop soon. If you see a lot of blue smoke or hear a metallic noise, shut off the engine.

What causes code P2599?

The most common causes are: 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.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.

P2599: Turbocharger Boost Control Position Sensor A Performance - Stuck High