Powertrain, generic · Auxiliary emission controls

P044D EGR Sensor C Circuit High

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. P044D means its signal is above the upper limit. Ford petrol engines from 2020 set it above 4.65 V for 5 s, beyond the measuring range that ends at 4.5 V (about +18 kPa) – typically an open sensor ground, a signal shorted to 5 V or positive, or a faulty sensor. EGR flow, hose and cooler checks are then suspended; MIL after two trips.

Likely causes

Sensor ground open
Signal shorted to 5 V or positive
Sensor faulty internally
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

P044CP044BP044AP0406P0402

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