P2E57 code meaning
Exhaust Pressure Sensor C Circuit High
Powertrain system Generic code P2Exx codes Check engine light
What P2E57 means
P2E57 reports a signal from exhaust pressure sensor C above the plausible ceiling. For sensor A Ford sets that ceiling at 4.80 V, on gasoline engines checked while the EGR monitor runs and with 5 s to fail, on 2023 diesels with 2 s; in Ford's gasoline transfer function 4.7 V already equals about 378 kPa. On a three-wire sensor a high reading usually comes from an open ground, a signal line in contact with the 5 V supply or a battery-fed circuit, or, depending on the input circuit, an open signal line pulled up inside the module. Soot or moisture in the sensing path rarely produce this electrical fault. No manufacturer publicly documents P2E57. After repair, clear the code and confirm that sensor C reads ambient pressure with the engine off. Low is P2E56, sensor A's high code P0473.
P2E57 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 P2E57
- MIL on
- Boost or EGR control in substitute mode, possibly less power
Common causes of P2E57
- Most likelyOpen ground circuit of sensor C
- PossibleSignal wire shorted to the 5 V reference or battery voltage
- PossibleOpen signal wire pulled high by the module input
- Less likelyInternally failed sensor C
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust pressure sensor cWiring harnessECM
What each part of P2E57 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 57 | The exact fault in that area. |
What to do next
- Note P2E57 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 P2E57
What does P2E57 mean?
P2E57 means "Exhaust Pressure Sensor C Circuit High". P2E57 reports a signal from exhaust pressure sensor C above the plausible ceiling. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E57?
Drive gently and only to a workshop. With P2E57 the car can go into limp mode (reduced power) to protect itself.
Will P2E57 fail an emissions test?
Yes, it can. P2E57 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 P2E57 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 P2E57 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.