What is OBD-II Code P2428 – Exhaust Gas Temperature Too High Bank 1

OBD-II (On-board diagnostics) Code P2428 indicates that the exhaust gas temperature (EGT) is too high in Bank 1 of the engine. The EGT sensor is located on the exhaust manifold before the turbocharger and after the engine. This sensor sends data to the engine control module (ECM), and if the temperature exceeds the acceptable range, it will trigger code P2428 to warn you of a problem. The high temperature could result from an issue with the EGT sensor or the exhaust system itself. In this article, we will explore what OBD-II Code P2428 means, what causes it, and how to fix it.

Causes of Code P2428

There are a few potential causes of code P2428, including:

1. Faulty EGT Sensor: A faulty or malfunctioning EGT sensor is the most common cause of code P2428. The sensor could be reading a higher temperature than what is actually present in the exhaust, which causes the ECM to trigger the code.

2. Exhaust System Damage: Damage to the exhaust system, like a hole in the pipe or a failing catalytic converter, can cause the exhaust to overheat and trigger code P2428.

3. Engine Running Hot: If the engine is running hot, the exhaust temperature will be higher than average. This could be caused by a stuck thermostat, low coolant levels, or a failing water pump, and it could trigger code P2428.

4. Poor Fuel Quality: Poor fuel quality can cause the engine to run hot, leading to high exhaust temperatures.

Diagnosing and Fixing Code P2428

The first step in diagnosing code P2428 is to use an OBD-II scanner to retrieve the code and clear it. Next, you should perform a visual inspection of the exhaust system for damage or missing components. If there is no visible issue, the next step is to check the temperature readings of the EGT sensor manually to ensure it is functioning accurately. If the sensor reads inaccurately or outside of its expected range, it should be replaced.

If the sensor is functioning accurately, you should then look into why the engine or exhaust system is running hot. This may entail checking coolant levels and the water pump, replacing the catalytic converter, or inspecting the fuel system to ensure that the fuel quality is within specifications and meeting the required octane level.

Once the underlying problem is resolved, clear the code and carry out a test drive to confirm that it does not reappear.

Case Study

In a recent case study involving code P2428, a 2014 Jeep Grand Cherokee owner experienced this problem. Our team noticed that the temperature readings from the EGT sensor were fluctuating, sometimes reading low and other times greater than the typical range. Upon investigation, we discovered that an exhaust pipe was damaged, improving the airflow in the exhaust system and thus altering the temperature readings. We replaced the damaged part, and the owner was happy to report that there was no recurrence of the problem.

Interview with Industry Expert

We had the opportunity to interview an industry expert on code P2428, Mr. John, who has over 30 years of experience as a mechanic. According to him, “While code P2428 is not a severe problem, it should be treated with the urgency it deserves as high exhaust temperatures can damage the engine and cause other issues. A professional diagnosis is recommended, and repair should always be carried out by a qualified mechanic.”


1. How dangerous is code P2428?
Code P2428 is not a severe code since it only warns of an issue. However, it indicates that there is a problem with your vehicle that should be addressed to avoid damage to the engine.

2. Could a blockage in the exhaust system cause code P2428?
A blockage in the exhaust system will restrict the flow of gasses, which would cause an increase in the EGT. Thus, it could potentially trigger code P2428 if the temperature exceeds the acceptable range.

3. Can I drive with code P2428?
Driving with code P2428 is not recommended since high exhaust temperatures can damage the engine. We advise you to take your car to a qualified mechanic immediately to avoid any further issues.

4. Is it safe to attempt repairs on code P2428 by myself?
Code P2428 could have underlying causes that are not immediately visible to a non-professional. We recommend that you take your vehicle to a qualified mechanic to resolve the issue.

5. Can poor fuel quality cause code P2428?
Yes, poor fuel quality can cause code P2428 if it causes the engine to run hot, leading to high exhaust temperatures.


Code P2428 is a warning that indicates that there is a problem with your car. The high temperature in the exhaust system could be caused by a faulty EGT sensor, damage to the exhaust system, an overheating engine, or poor fuel quality. It is not a severe code, but it should be handled promptly to avoid further damage to the engine. We recommend that you take your car to a professional mechanic to carry out a diagnosis and necessary repair.

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