P01FB code meaning
Turbocharger Outlet Pressure Sensor B Range/Performance
Powertrain system Generic code P01xx codes Check engine light
What P01FB means
Turbocharger outlet pressure sensor B is a second pressure sensor at a compressor outlet – for example one per turbo on twin-turbo engines or a second measuring point; sensor A has the codes P00F8–P00FC. It is a separate family from the boost pressure sensor: GM and Ford report the pressure ahead of the throttle under the boost sensor codes P0236–P0238. No manufacturer using the sensor B codes was found; FCA documents sensor A and a second outlet sensor. P01FB is the plausibility fault: the signal is electrically valid but does not fit. After a long stop all pressures should equal barometric pressure; while running the value is compared with a pressure modelled from airflow, speed and throttle – GM flags its boost sensor at deviations of roughly 25–30 kPa.
P01FB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P01FB
- Check engine light on
- Loss of power, boost limited
- Limp mode possible
Common causes of P01FB
- Most likelySensor drifting or stuck
- PossibleLeaking charge air hose or blocked pressure port
- PossibleContact resistance at the connector
- Less likelyFault in other model inputs (MAF, MAP)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Turbocharger outlet pressure sensor bSensor wiringEngine control module
What each part of P01FB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| FB | The exact fault in that area. |
What to do next
- Note P01FB 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 P01FB
What does P01FB mean?
P01FB means "Turbocharger Outlet Pressure Sensor B Range/Performance". Turbocharger outlet pressure sensor B is a second pressure sensor at a compressor outlet – for example one per turbo on twin-turbo engines or a second measuring point; sensor A has the codes P00F8–P00FC. It is a generic code, so it means the same on every make.
Is it safe to drive with P01FB?
Drive gently and only to a workshop. With P01FB the car can go into limp mode (reduced power) to protect itself.
Will P01FB fail an emissions test?
Yes, it can. P01FB 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 P01FB to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P01FB clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.