P00AF code meaning
Turbocharger/Supercharger Boost Control A Module Performance
Powertrain system Generic code P00xx codes Check engine light
What P00AF means
Boost control A here is an electronic actuator with its own electronics (a "smart" actuator), usually on the variable turbine geometry, with its own position sensor and controlled over a data bus or a pulsed signal. It checks itself and reports internal faults to the engine control module; documented examples are pattern errors, overcurrent and checksum errors. The control module cannot narrow down a fault inside the actuator further. P00AF is set when actuator A reports such an internal fault. Manufacturer bulletins recommend checking the vane mechanism for free movement and, if it moves freely, replacing only the actuator rather than the whole turbocharger.
P00AF at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P00AF
- Check engine light on
- Loss of power or limp mode with reduced boost
- Often stored with actuator position or boost codes
Common causes of P00AF
- Most likelyElectronics or motor inside the actuator faulty
- PossibleSector gear or vane mechanism sticking (soot, coking), causing overcurrent
- PossibleWeak supply or ground, corroded connector
- Less likelySoftware of actuator or control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Boost control actuator aTurbocharger vanes or wastegateActuator wiring
What each part of P00AF means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| AF | The exact fault in that area. |
What to do next
- Note P00AF and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P00AF
What does P00AF mean?
P00AF means "Turbocharger/Supercharger Boost Control A Module Performance". Boost control A here is an electronic actuator with its own electronics (a "smart" actuator), usually on the variable turbine geometry, with its own position sensor and controlled over a data bus or a pulsed signal. It is a generic code, so it means the same on every make.
Is it safe to drive with P00AF?
Drive gently and only to a workshop. With P00AF the car can go into limp mode (reduced power) to protect itself.
Will P00AF fail an emissions test?
Yes, it can. P00AF is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P00AF to fix?
Difficulty: hard. A typical repair takes 1.5 to 4 hours of work. This is a job for a workshop.
Will P00AF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.