OBD-II code · Powertrain (generic, extended)
P259E Turbocharger A Boost Control Position At Low Limit
The boost-control actuator on turbo A has been operating at the low end of its travel for too long — the closed-loop controller is saturated against the lower stop trying to reach the boost setpoint. Indicates either a leak (wastegate held closed but boost still escapes) or commanded boost above what the engine can produce.
Is it safe to drive with P259E?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyBoost leak in the charge-air path
- PossibleFailing turbocharger that cannot produce target boost
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, Boost Control Loop
Related codes
- P25A0Turbocharger B Boost Control Position At Low Limit
- P259BTurbocharger Boost Control Position Sensor B Performance - Stuck High
- P259CExcessive Time To Enter Closed Loop Turbocharger A Boost Control
- P259DExcessive Time To Enter Closed Loop Turbocharger B Boost Control
- P259FTurbocharger A Boost Control Position At High Limit
- P25A1Turbocharger B Boost Control Position At High Limit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.