P044AEGR Sensor C Circuit
- 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. 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.
- What you may notice
- Check engine light on
- Usually no change in driving
- EGR readiness not set, EGR possibly switched off
- Likely causes
- LikelyConnector or wire to sensor C open or corroded
- PossibleSensor faulty
- Possible5 V reference or ground disturbed (with other sensor codes)
- RareEngine module
- 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.