P044CEGR Sensor C Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Usually no change in driving
- EGR readiness not set, EGR possibly switched off
- Likely causes
- Likely5 V supply of the sensor open or shorted to ground
- LikelySignal wire shorted to ground
- PossibleSensor faulty internally
- PossibleConnector corroded or off
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.