Powertrain, generic (extended)

P2E57 Exhaust Pressure Sensor C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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 petrol engines checked while the EGR monitor runs and with 5 s to fail, on 2023 diesels with 2 s; in Ford's petrol 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.

Likely causes

Open ground circuit of sensor C
Signal wire shorted to the 5 V reference or battery voltage
Open signal wire pulled high by the module input
Internally failed sensor C

Symptoms

  • MIL on
  • Boost or EGR control in substitute mode, possibly less power

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust pressure sensor cwiring harnessecm

Related codes

P2E56P2E54P2E55P0473P047D

References: fordservicecontent.com, fordservicecontent.com, law.cornell.edu.