Powertrain
generic / SAE
P259C
Excessive Time To Enter Closed Loop Turbocharger A Boost Control
After start-up the boost-control loop on turbo A takes longer than the calibration limit to transition from open-loop to closed-loop control. Typically a slow-warming actuator (VGT vanes carbonised), a sluggish position sensor or a leaky pneumatic actuator that cannot follow setpoints quickly enough.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 9C
Possible causes
- Carbonised VGT vanes high
- Leaky pneumatic actuator medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 300–2200 €
- Estimated time: 1–5 h
- Component: turbo actuator a
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012