P25F2 code meaning
Turbocharger/Supercharger Boost Sensor C Circuit
Powertrain system Generic code P25xx codes Check engine light
What P25F2 means
A third boost pressure sensor, C, only makes sense on engines with several charging stages or chargers – for example a supercharger feeding a turbocharger, or a two-stage turbo system – where pressure is measured between the stages as well as ahead of the throttle. Which location carries the letter C is up to the manufacturer. P25F2 is the general circuit fault of this sensor, without separating low, high or implausible signals (those are P25F3 to P25F5); a networked sensor C would report lost communication as U060D instead. No manufacturer documents P25F2 publicly. For sensor A, GM-built Saab engines check the circuit all the time while the ignition is switched on and fall back to mechanical base boost with a clear loss of power, which is the likely reaction here as well.
P25F2 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 repairWhen cleared with a scanner
Symptoms of P25F2
- Check engine lamp on
- Reduced power, boost limited to base level
Common causes of P25F2
- Most likelyLoose, corroded or oily connector at boost sensor C
- PossibleSignal, 5 V reference or ground wire damaged
- PossibleBoost sensor C failed internally
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Boost pressure sensor cWiring harness
What each part of P25F2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| F2 | The exact fault in that area. |
What to do next
- Note P25F2 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 P25F2
What does P25F2 mean?
P25F2 means "Turbocharger/Supercharger Boost Sensor C Circuit". A third boost pressure sensor, C, only makes sense on engines with several charging stages or chargers – for example a supercharger feeding a turbocharger, or a two-stage turbo system – where pressure is measured between the stages as well as ahead of the throttle. It is a generic code, so it means the same on every make.
Is it safe to drive with P25F2?
Drive gently and only to a workshop. With P25F2 the car can go into limp mode (reduced power) to protect itself.
Will P25F2 fail an emissions test?
Yes, it can. P25F2 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 P25F2 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 P25F2 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.