Powertrain, generic · Auxiliary emission controls

P044C EGR Sensor C Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. What EGR sensor C is depends on the maker: on Ford petrol engines from 2020 it is the DPFE sensor, which measures the pressure drop across an orifice in the EGR pipe (sensor A there is the valve position sensor); GM diesels assign it to the position sensor of a low-pressure EGR valve, but only within fault groups. P044C means its signal is below the lower limit. Ford petrol engines from 2020 set it below 0.25 V for 5 s – a value the sensor cannot produce, since 0.5 V already means −11 kPa – so the signal is shorted to ground, the 5 V supply is open or the sensor is faulty. EGR flow, hose and cooler checks are then suspended; MIL after two trips.

Likely causes

5 V supply of the sensor open or shorted to ground
Signal wire shorted to ground
Sensor faulty internally
Connector corroded or off

Symptoms

  • Check engine light on
  • Usually no change in driving
  • EGR readiness not set, EGR possibly switched off

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.3–1.5 h

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

Parts involved

egr sensor cdpfe sensorsensor wiringengine control module

Related codes

P044DP044BP044AP0405P0401

References: fordservicecontent.com, gsi.ext.gm.com, law.cornell.edu.