OBD-II code · Powertrain (generic, extended)
P259F Turbocharger A Boost Control Position At High Limit
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 with P259F?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyWastegate stuck closed
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–5 h
- Emissions test
- Likely to fail
- Parts involved
- Turbo Actuator A, Wastegate
Related codes
- P259ETurbocharger A Boost Control Position At Low Limit
- P25A1Turbocharger B Boost Control Position At High Limit
- P259CExcessive Time To Enter Closed Loop Turbocharger A Boost Control
- P259DExcessive Time To Enter Closed Loop Turbocharger B Boost Control
- P25A0Turbocharger B Boost Control Position At Low Limit
- P25A2Brake System Control Module A Requested MIL Illumination
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.