Will P0128 Code Clear Itself? Discovering the Thermostat Failure

Is your car displaying the "check engine" light with a P0128 code? If so, don't panic - there's a good chance that the issue can be resolved relatively easily. In this post, we'll discuss the thermostat failure that can cause this code and outline some steps you can take to troubleshoot it yourself. So read on to learn more about the P0128 code and what you can do to fix it!

P0128 code highlights

• Level of urgency:High
• Possible culprits:thermostat problems, issues with engine coolant temp sensors
• Price for repair:$100 - $450
• If neglected:Engine won't work efficiently
• DIY repairs:Possible but complicated
• Can you drive?Carefully

What is a thermostat, and what does it do in a car engine cooling system?

A thermostat is a temperature-regulated valve that controls the flow of coolant in a car engine cooling system. The thermostat is located between the engine and the radiator, and it opens and closes to regulate the flow of coolant.

When the engine is cold, the thermostat is closed to prevent coolant from flowing through the radiator. This allows the engine to warm up faster. Once the engine reaches its operating temperature, the thermostat opens to allow coolant to flow through the radiator. This helps to keep the engine from overheating. Therefore, the thermostat is an essential component of a car cooling system, and it helps to ensure that the engine operates at its optimal temperature.

The P0128 code and what it means for your car

The P0128 code is a diagnostic trouble code (DTC) for "Engine Coolant Temperature Below Thermostat Regulating Temperature." This code indicates that the engine coolant temperature is not getting hot enough, fast enough.

The thermostat is designed to open at a specific temperature to allow coolant to flow and to close when the engine has reached operating temperature. If the thermostat gets stuck in the open position, it will cause the engine to run too cold. This can lead to decreased fuel economy and increased emissions. If the thermostat gets stuck in the closed position, it will cause the engine to overheat. Either way, it's important to have the P0128 code diagnosed and your car repaired as soon as possible.

Common symptoms of a failing or failed thermostat in a car engine cooling system

• Overheating engine. One of the most common symptoms of a failing or failed thermostat in a car engine cooling system is an overheating engine. The thermostat is responsible for regulating the flow of coolant through the engine, and when it fails, coolant is no longer able to circulate properly. As a result, the engine begins to overheat, leading to severe damage. In most cases, a mechanic will be able to tell if the thermostat is failing by examining the engine coolant level and temperature gauge. If the coolant level is low and the temperature gauge is reading high, then it is likely that the thermostat is the cause of the problem.
• Coolant leaks. Another common symptom is a coolant leak. If the thermostat housing develops cracks or leaks, coolant will escape, and the engine will not be able to maintain proper operating temperatures. Most leaks occur at the housing gasket or O-ring seal where the thermostat mounts to the engine. A small drip can turn into a large puddle quickly, so it's important to check your coolant level regularly and top off as needed. If you see a coolant leak, take your car to a mechanic as soon as possible to have the thermostat replaced. It's a relatively inexpensive repair that can save you a lot of money down the road.
• Poor engine performance. A failing or failed thermostat in a car engine cooling system can cause the engine to perform poorly for a number of reasons. First, the thermostat controls the flow of coolant through the engine. If the thermostat is not working properly, the coolant will not flow through the engine at the correct rate. This can cause the engine to overheat, leading to poor performance. Additionally, a failing thermostat can cause the engine to run too cold. This can also lead to poor performance as well as increased fuel consumption. In order to avoid these problems, it is important to have a functioning thermostat in your car's engine cooling system.
• Poor fuel economy. A failing thermostat may also lead to poor fuel economy. An overheated engine can damage various components and lead to higher fuel consumption. Furthermore, a failed thermostat may cause the engine cooling system to work harder than necessary, which can also lead to increased fuel consumption. Therefore, a failing or failed thermostat can have a significant impact on fuel economy.
• Engine shutdown. A failing thermostat can cause the engine to overheat and shut it down completely. In some cases, the thermostat may also fail to close properly, which can cause coolant to leak from the cooling system. As a result, the engine may run cooler than normal, which can also lead to engine shutdown.

If you notice any of these symptoms, it is important to have your car checked by a qualified mechanic as soon as possible.

Causes of thermostat failures

• Loose or damaged radiator cap. In order for a car's engine to run properly, it needs to be kept at a stable temperature. To achieve this, the engine is cooled by a mixture of water and antifreeze, which is circulated through a system of hoses and radiators. The radiator cap is an important component of this system, as it helps to regulate the pressure and prevent coolant from leaking out. Sometimes, however, a loose or damaged radiator cap can cause coolant to escape, leading to engine overheating and a P0128 failure. In order to prevent this problem, it is important to regularly check the condition of your radiator cap and replace it if necessary.
• A problem with a thermostat Another common cause of P0128 failures is a problem with the thermostat itself. A faulty thermostat may fail to open, preventing coolant from flowing through the engine and causing the engine to run too cold. In some cases, a thermostat may become stuck in the open position, resulting in an overheated engine.
• Dirt and obstruction. A dirty or obstructed cooling system can also cause the engine to run too cold, triggering a P0128 failure.
• Coolant leaks. Finally, a very common cause of P0128 failures is a coolant leak. Even a small leak in the coolant system can cause the engine to malfunction.

How to troubleshoot the thermostat in your car

If you're having trouble with your car's thermostat, there are a few things you can do to troubleshoot the problem:

• First, check the coolant level in the radiator. If it's low, then the thermostat may not be opening properly, causing the engine to overheat.
• Another possibility is that the cooling fans are not coming on when they should. This can be caused by a faulty fan switch or a bad wire. If the engine is overheating, then the thermostat may be stuck in the closed position. In this case, you'll need to replace it.
• Finally, make sure that the radiator hoses are not collapsed or blocked. If they are, then coolant won't be able to circulate properly, and the engine will overheat.

By troubleshooting the problem, you can narrow down the cause and get your car back to running smoothly.

How to replace a faulty thermostat

If your car's thermostat is faulty, it can cause a number of problems. You already know that the engine may overheat, the "check engine" light may come on, and the car may run rough. What we will focus on here is the replacement process. Luckily, replacing a faulty thermostat is a relatively easy repair that you can do yourself. Here's how:

• First, locate the thermostat housing. It is usually located near the radiator.
• Once you've found it, unscrew the housing and remove the old thermostat.
• Next, install the new thermostat in the housing and screw the housing back in place.
• Finally, fill the radiator with coolant and start the engine.
• Let it idle for a few minutes to allow the thermostat to warm up and then check the temperature gauge to make sure it's reading correctly.

By following these steps, you can easily replace a faulty thermostat in your car.

What are the costs of repairing or replacing a thermostat in a car engine cooling system?

Replacing a thermostat is not a difficult task, but it can be pricey. The cost of the thermostat itself will vary depending on the model of the car, but it is typically between $100 and $300. More expensive cars may require you to pay as much as $500 for a thermostat. In addition, labor costs can range from $50 to $200, depending on the complexity of the job. As a result, repairing or replacing a thermostat can be a significant expense.

Conclusion

A thermostat is an important part of your car's engine cooling system. If it fails, it can cause a variety of problems that will affect the performance and longevity of your vehicle. If you are experiencing any of the symptoms of a failed or failing thermostat, be sure to troubleshoot and replace it as soon as possible. By doing so, you'll help keep your car running smoothly for years to come.