What are the common causes of P259F?

Wastegate actuator stuck at full travel. Boost control solenoid failed. Boost position sensor drift. Carbon binding the vanes on turbo A. Wiring fault in the boost control circuit.

Check boost control position live data on turbo A. Command the actuator through its range with a scan tool. Inspect the turbo A wastegate linkage for carbon or binding. Test the boost control solenoid and its wiring. Compare boost A position to the target. Clear the code and retest.

P259F

Turbocharger A Boost Control Position At High Limit

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P259F means Turbocharger A Boost Control Position At High Limit.

Check these first

Wastegate actuator stuck at full travel
Boost control solenoid failed
Boost position sensor drift
Carbon binding the vanes on turbo A
Wiring fault in the boost control circuit

What to do next

Check boost control position live data on turbo A
Command the actuator through its range with a scan tool
Inspect the turbo A wastegate linkage for carbon or binding
Test the boost control solenoid and its wiring
Compare boost A position to the target
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.