Powertrain, generic · Auxiliary emission controls

P044A EGR Sensor C Circuit

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. P044A is the general circuit fault of this sensor. No manufacturer document available to us uses it – Ford splits it into P044C/P044D – so the description follows CARB's requirement to check input circuits for continuity and range. Without the sensor, EGR flow and cooler checks are suspended.

Likely causes

Connector or wire to sensor C open or corroded
Sensor faulty
5 V reference or ground disturbed (with other sensor codes)
Engine module

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

P044BP044CP044DP044EP0409

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