P044C - OBD Trouble Code

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When does the recirculation sensor indicate that the circuit low? What is OBD error code P044C? P044C is considered as the generic type of diagnostic code as it is applicable to all model and makes. But few repair steps will vary depending on your engine model. Though there are different designs of (Exhaust Gas Recirculation), they all operate in a similar manner.

The PCM is controlled by the EGR valve which allows a desired amount of exhaust gasses to be sent into the cylinders which burns with the air/ fuel mixture. As exhaust gas is an inert gas which displaces oxygen. When you inject it back into the cylinder, it will lower the combustion temperature which helps to improve the emissions of NOx (Oxides of Nitrogen).

A wire joint plugs into the valve and in turn is commanded by the PCM as needed. There can be 4 to 5 wires, 1-2 grounds, and 12-volt feed of ignition, 5- volt reference circuit and a circuit for feedback. Other systems are controlled by the vacuum. These connections are quite simple. The PCM controls the vacuum solenoid when it is activated and allows the vacuum to move through the EGR valve and open it. This type of EGR valve also has an electrical connector for the feedback circuit. The feedback circuit of the EGR system will allow the PCM to see if the pintle of the EGR valve is moving smoothly. If the EGR, “C” circuit detects either the voltage or its position to be low, then the code P044C will be set. You can also refer to the repair manual of your vehicle to locate the “C” sensor.

What causes this problem with the Exhaust Gas Recirculation Sensor "C" Circuit Low?

• Short to ground either in the reference circuit or EGR signal.
• Short to voltage either in the signal circuit or the EGR ground.
• Very poor EGR valve.
• A very poor wiring issue with the PCM due to resistance or loose terminals.

1. Wiring issues - A loose connection or damaged wires can cause OBD error P044C in your system. Replace the faulty wires to avoid this error.
2. Powertrain Control Module - Is your PCM having a poor wiring issue due to resistance or loose terminals? Then it’s time to replace them with best components from Parts Avatar.
3. Wiring Harness plugs - If the plugs of your wire joints are not properly connected, faults can rise in your engine system. Repair or replace them with best ones.
4. EGR Ground Signal Circuits - Are your circuits loosely connected to the ground? Visually inspect the component and fix the loose connection.

Interested to know more about the symptoms OBD code P044C? If yes, then you are at the right place. We at Parts Avatar have listed out few common symptoms associated with Exhaust Gas Recirculation Sensor "C" Circuit Low problem.

Common Symptoms

• The engine refuses to accelerate
• Excessive leak in the exhaust
• Exhaust is either rich or lean
• Reduced fuel efficiency

Have a look at some ways with which you can correct the P044C code:

The engine management computer will get signal from the oxygen sensors as to how much amount of oxygen is present in the exhaust, which can be used to determine and control the ratio of the fuel. The red voltmeter lead should be connected to the IMRC valve power wire and the black voltmeter lead should be attached to the ground while the valve is disconnected. Apply dielectric silicone compound around the connector cavity (compound which is used for spark plug wires and bulb sockets) and reassemble them.

In order to diagnose the Engine error Code P044C, you have to check for faults in your engine. Some of them are mentioned below

• If the feedback indicates that the valve responds and is moving properly, then there may be an irregular problem.
• During cold weather, the moisture may freeze and can stick to the valve. The problem will disappear once the engine warms up.
• Even carbon or other rubbles can stick to the valve. If the EGR valve does not respond, then disconnect the EGR harness connector with the help of a scan tool.
• Keep the engine off while the key is ON. With the help of a voltmeter, check for 5 volts on the EGR valve. If there is 12 volts other than 5, then repair the short to voltage.
• Connect a test light to the battery voltage if there is no voltage connect and examine the 5 Volt reference wire. If the test light is well – lit, then the 5 Volt reference circuit is shorted to the ground which needs repairing. If it does not light, then check for any opening.
• There may be a fault with the PCM, if there is no 5 volt reference. However, there can be other codes too. If there is 5 volt in the reference circuit then jump the 5 volt to the signal circuit of the EGR.
• Now there should be 100 percent in the EGR position of the scan tool. If there is no connection, then test the light which connects the battery voltage and examine the EGR signal circuit. If there is illumination, then there will be a short to the ground. So repair as required.
• Check for any opens in the EGR signal circuit, if there is no illumination and repair as needed. After a jump, you have to ring the 5 volt reference circuit to the EGR circuit with the help of a scan tool.
• Check if there are any poor terminal tension at the EGR connector. If the wirings are proper, then you have the pair the EGR valve.
• Command the EGR valve On, if you have access to a scan tool.

Common Mistakes When Diagnosing the P044C Code

• Fault in the EGR valve.
• Fault in the Powertrain Control Module (PCM).
• Problem with wiring.