P044B code meaning
EGR Sensor C Circuit Range/Performance
Powertrain system Generic code P04xx codes Check engine light
What P044B means
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 gasoline 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.
P044B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P044B
- Check engine light on
- Usually no change in driving
- EGR readiness not set, EGR possibly switched off
Common causes of P044B
- Most likelyPressure hoses off, swapped or blocked (soot, condensate)
- PossibleSensor zero point drifted
- PossibleOrifice or EGR pipe coked
- Less likelyContact resistance in the connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR sensor cDpfe sensorSensor wiringEngine control module
What each part of P044B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 4B | The exact fault in that area. |
What to do next
- Note P044B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P044B
What does P044B mean?
P044B means "EGR Sensor C Circuit Range/Performance". Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. It is a generic code, so it means the same on every make.
Is it safe to drive with P044B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P044B fail an emissions test?
Yes, it can. P044B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P044B to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P044B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.