Code result
P259F
Turbocharger A Boost Control Position At High Limit
Moderate severity
What it means
The boost-control actuator on turbo A has been operating at the high end of its travel — the controller is saturated against the upper stop trying to bleed off boost. Indicates either a wastegate stuck closed, oversized turbo for the calibration, or commanded boost limits being exceeded by ambient conditions (cold dense air).
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Wastegate stuck closed
highOne of the most commonly reported causes for this code — check this first.
Related help
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