What is the P0544 fault number? What is the Exhaust Gas Temperature sensor circuit malfunction (Bank 1, Sensor 1)? How can I fix the fault code P0544? What are the symptoms and causes for the P0544 fault code
What is the P0544 Fault code? What does it mean
P0544 is an indication that the powertrain controller module (PCM), has detected a problem in the exhaust gas temperature sensor circuit. If the voltage signals coming from the exhaust gas temperature sensor and the PCM exceed their programmed range, fault code (P0544) is activated and the check engine lamp comes on.
“Bank 1” In the code description, refers to the engine row with the cylinder 1 and “Sensor 1” Refers to the “up” EGT sensor located in front of the catalytic convertor. The EGT sensor is located between gasoline vehicles’ exhaust manifolds and the catalytic convert in diesel vehicles. It is usually near the turbo exhaust inlet for turbo vehicles.
EGT sensors are used to monitor the exhaust gas temperature and protect catalytic converters from excessive heat. It is found in the majority of new gasoline and diesel engines. It is made up of a heat-sensitive resistor that transmits exhaust heat to the PCM and converts it to an electrical voltage. It typically has two cables. One wire is used as ground and the other to receive the 5 volt reference from the PCM. Grounding resistance decreases as exhaust gas temperature rises, while the voltage signal goes up. If the PCM detects a voltage signal from an exhaust gas temperature sensor that is too high or lower, it will change the engine timing and fuel mixture to bring it back within acceptable limits and protect the catalytic convert. The data from the EGT sensor can also be used to determine DPF renewal in diesel vehicles.
The P0544 fault code can affect vehicles of all makes and models, including but not limited to: Volkswagen, Mercedes-Benz. Audi, Land Rover. Renault. Opel. Nissan. Jeep.
What causes the P0544 Fault code?
The following are the most frequent causes of the P0544 fault code:
- – Corroded wires or connectors that are loose, corroded or damaged to the EGT sensor.
- – Short circuit in ground cable from EGT sensor and PCM
- Pressure problems can be caused by improper exhaust application, sub-industry use or poor quality components
- – Excessive exhaust leakage at the sensor’s intake
- – Defective EGT sensor (Bank 1, Sensor 1)
What are the symptoms for P0544 fault code?
You may experience the following symptoms if your vehicle has the code P0544:
- – Turn on the engine light (often without other symptoms).
How to Fix the P0544 Fault Code
Inspecting the exhaust gas temperature sensor, and all its circuits, is the first step. If the connectors and wires are not damaged, it is best to disconnect the sensor and check its resistance with a digital OHMmeter. An EGT sensor that is properly working will have resistance of approximately 150 ohms. Replace the sensor if it has a resistance lower than 50 ohms.
Use a heat gun or hair dryer to heat the sensor and then monitor it using an ohmmeter. As the sensor heats up, its resistance should decrease and then increase as it cools down. A sensor that is not working properly should be replaced.
When repairing this code, the most common error is to mistakenly believe that the EGT sensor and oxygen sensor are connected. It is not a good idea to replace the oxygen sensor. This will not solve the malfunction code.
You can make the following repairs to fix the P0544 fault code
- – Repair and replacement of short or open circuit cables or connectors that are damaged, melted, or corroded to the EGT sensor
- – Fixing ground wire issues in EGT sensors
- – Test and replacement of the EGT sensor if necessary
- – Repair leaks in exhaust system
- – Reprogramming or replacement for a defective PCM
How serious is the P0544 Fault code?
Although P0544 is not intended to interfere with or stop vehicle operation, it can cause electrical and voltage problems. The PCM depends on the sensor for optimal functions. The code can cause exhaust system overheating and damage to the catalytic converter if it is not followed. This can lead to much higher repair costs.
