Powertrain, generic · Auxiliary emission controls

P044B EGR Sensor C Circuit Range/Performance

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. P044B means its signal is electrically valid but implausible – for example a pressure difference with the valve closed, or no reaction when it opens. No manufacturer document available to us uses this code; Ford checks the DPFE plausibility under its own codes P139A–P139C (hoses swapped, front or rear hose off or blocked). EGR flow diagnosis is then suspended.

Likely causes

Pressure hoses off, swapped or blocked (soot, condensate)
Sensor zero point drifted
Orifice or EGR pipe coked
Contact resistance in the connector

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€30–250
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

P044AP044CP044DP044EP0401P0402

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