Diagnostic Trouble Code
P044E
Exhaust Gas Recirculation Sensor C Circuit Intermittent
Technical Description P044E
Exhaust Gas Recirculation Sensor "C" Circuit Intermittent/Erratic
What Does This Mean P044E?
This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models, 1996-newer. However, specific troubleshooting steps will vary depending on the vehicle.
On board diagnostics (OBD) trouble code P044E is a generic trouble code relating to an intermittent or erratic problem incurred in the "C" electrical circuit to the exhaust gas recirculation (EGR) valve.
The purpose of the EGR valve is to introduce a regulated amount of exhaust gas into the intake manifold. The purpose is to maintain cylinder head temperatures below 2500-degrees F. Nitrates of Oxygen (Nox) form when temperatures rise above 2500-degrees F. Nox is responsible for smog and atmospheric pollution.
The controlling computer, either the powertrain control module (PCM) or the electronic control module (ECM) has detected an abnormally low, high or non-existent signal voltage. Refer to a manufacturer specific repair guide to determine which is the "C" sensor in your exact vehicle.
The trouble code P044E refers to the same problem on all vehicles, however, there are many types of EGRs, sensors and methods of activation. The only similarity is that they all vent exhaust gas into the intake manifold to cool the cylinder head temperatures.
Introducing spent exhaust gas into the engine at the wrong time reduces horsepower and causes a rough idle or stall. With this in mind, computer programming only opens the EGR when the engine RPM is above 2000 and to close when under a load.
Related EGR sensor "C" trouble codes:
On board diagnostics (OBD) trouble code P044E is a generic trouble code relating to an intermittent or erratic problem incurred in the "C" electrical circuit to the exhaust gas recirculation (EGR) valve.
The purpose of the EGR valve is to introduce a regulated amount of exhaust gas into the intake manifold. The purpose is to maintain cylinder head temperatures below 2500-degrees F. Nitrates of Oxygen (Nox) form when temperatures rise above 2500-degrees F. Nox is responsible for smog and atmospheric pollution.
The controlling computer, either the powertrain control module (PCM) or the electronic control module (ECM) has detected an abnormally low, high or non-existent signal voltage. Refer to a manufacturer specific repair guide to determine which is the "C" sensor in your exact vehicle.
The trouble code P044E refers to the same problem on all vehicles, however, there are many types of EGRs, sensors and methods of activation. The only similarity is that they all vent exhaust gas into the intake manifold to cool the cylinder head temperatures.
Introducing spent exhaust gas into the engine at the wrong time reduces horsepower and causes a rough idle or stall. With this in mind, computer programming only opens the EGR when the engine RPM is above 2000 and to close when under a load.
Related EGR sensor "C" trouble codes:
Symptoms P044E
1
The service engine soon light will illuminate and the OBD code P044E will be set. Additionally, a second code relating to the EGR sensor failure may be set. Code P044C relates to a low sensor voltage and P044D relates to a high voltage situation
2
If the EGR pintle is stuck partly open, the vehicle will not idle well or stalls
3
Ping from detonation may be heard when under a load or at high RPM
4
No symptoms at all
Possible Causes P044E
1
Defective EGR sensor "C"
2
Defect in the wiring harness to the sensor
3
EGR pintle stuck in the closed position and a build up of carbon is preventing it from opening
4
Lack of vacuum to the EGR solenoid
5
Defective EGR solenoid
6
Defective EGR position sensor
7
Defective differential pressure feedback EGR sensor.