Why oil pressure light comes ON when engine is hot? It’s a terrifying feeling knowing that something could be seriously wrong with your engine.

As a car owner, the last thing you want to see is a warning light indicating a potential engine problem, especially when you’re far from home. While an illuminated oil pressure light usually signifies a low or droppin’ oil pressure issue, the fact that it comes on only when the engine is hot can seem more mysterious. However, there is usually a simple explanation for this puzzling occurrence.

In this blog post, I’ll explain the most common causes of an oil pressure light turning on solely when the engine is warm or hot and provide some easy steps you can take to diagnose and fix the problem.

Oil Pressure Light And Its Importance

Before we dive into why your oil pressure light might come on when your engine is hot, let’s first understand what this warning light indicates and why it’s so important.

The oil pressure light is a crucial warning system for your car’s engine. It is connected to a sensor that measures the pressure in the engine’s oil system. If there is an issue with the oil pressure, the light will turn on to alert you that something needs attention.

A low or dropping oil pressure can be caused by various issues, from a leak in the system to an old and worn-out oil pump. Ignoring this warning sign could lead to significant engine damage, so addressing the problem as soon as possible is essential.

Reasons of Why Oil Pressure Light comes ON When Engine is Hot?

Now that we understand the importance of the oil pressure light let’s take a look at some of the common reasons why it might turn on only when your engine is hot:

Low Oil Level

One of the most common causes of an oil pressure light coming on when your engine is hot is simply a low oil level. As the engine heats up, the oil thins out, making it more difficult for the pump to maintain adequate pressure.

This can occur when the oil level is below the recommended amount, leading to a decrease in oil pressure and triggering the warning light. It is essential to regularly check and maintain the proper oil level to ensure optimal engine performance and prevent potential damage.

Oil Viscosity

Another factor that can contribute to a low oil pressure when the engine is hot is the viscosity or thickness of the oil. As mentioned, the oil thins out as the engine heats up and becomes less dense. If you are using an oil with a higher viscosity than recommended for your car, it may not be able to maintain sufficient pressure in warmer temperatures. This can cause the oil pressure light to come on when the engine is hot.

It is crucial to use the type of oil recommended for your car’s engine and to change it regularly according to the manufacturer’s guidelines. This will ensure that your engine has the proper lubrication and maintains consistent oil pressure, even when operating at higher temperatures.

Faulty Oil Pressure Sensor

The oil pressure light may come on when your engine is hot due to a faulty oil pressure sensor. This sensor can become worn out or damaged over time, causing it to send incorrect readings to the car’s computer system and trigger the warning light.

Suppose you have ruled out other potential causes, such as low oil level or viscosity issues. In that case, it is worth having your oil pressure sensor checked and replaced by a certified mechanic.

Oil Pickup Tube Clogged

Another possible reason for an oil pressure light coming on when the engine is hot is a clogged oil pickup tube. This tube is responsible for drawing in the oil from the bottom of the oil pan and sending it to the engine. Over time, debris or sludge can build up in the tube, obstructing proper flow and causing a pressure drop.

If this is the case, thoroughly cleaning the oil pickup tube may be necessary to restore proper oil pressure. It’s essential to regularly change your engine oil and use high-quality filters to prevent buildup and clogging in the pickup tube.

Oil Filter Issues

Like a clogged oil pickup tube, a dirty or old filter can restrict oil flow and cause pressure problems. If your oil pressure light comes on when your engine is hot, it’s worth checking and potentially replacing your oil filter.

Low-Efficiency Level Of Engine

Finally, the last reason your oil pressure light may come on when the engine is hot is low efficiency. This can occur when there are worn-out or damaged components in the engine, such as bearings or seals, causing excessive friction and heat.

As the engine heats up, this friction can lead to a drop in oil pressure and trigger the warning light. In this case, having your engine inspected by a professional mechanic and replacing any worn or damaged parts to restore proper functioning is crucial.

Learn about What Causes Engine Surging And How To Fix?

Steps To Fix The Oil Pressure Light Issue

Now you may know why oil pressure light comes ON when engine is hot. If you notice your oil pressure light coming on when the engine is hot, here are some steps you can take to diagnose and fix the problem:

Check the Oil Level

The first and most crucial step in maintaining your engine’s performance is regularly checking the oil level. Doing so ensures your engine is properly lubricated, reducing friction and wear on its components.

If the oil level is below the recommended amount, it is essential to top it up promptly with the proper oil type to ensure optimal engine function and longevity. Regular oil checks and maintenance are vital to keeping your engine running smoothly for years.

Check For Leaks

If the oil level is at the recommended amount, it’s a good idea to check for leaks in the oil system. This can include inspecting the oil pan gasket, valve cover gasket, and other potential areas where oil leaks.

If you find any leaks, it’s essential to address them promptly to prevent further loss of oil and potential engine damage. Regularly checking for leaks during routine oil changes and maintenance is also a good idea.

Inspect the Oil Pressure Sensor

If you have ruled out low oil levels and leaks as potential causes, inspecting the oil pressure sensor may be necessary. This can usually be done by a certified mechanic using specialized oils to test the sensor’s functionality.

If the sensor is faulty, it can be replaced to restore proper readings and prevent false alarms from the oil pressure light.

Clean or Replace the Oil Pickup Tube

In cases where a clogged oil pickup tube is causing low oil pressure when the engine is hot, it may be necessary to clean or replace the tube. A mechanic can usually do this during a routine oil change, and it’s essential to use high-quality filters and regularly change the oil to prevent future clogging.

Inspect Engine Components

If all other potential causes have been ruled out, inspecting the engine components for any worn or damaged parts may be necessary. This can include bearings, seals, and other critical elements contributing to the engine’s efficiency.

If any issues are found, they must be replaced promptly to prevent further damage and maintain optimal engine performance. Regular maintenance and inspections can help catch these problems early on and avoid potentially costly repairs in the future.

Why is My Oil Light ON, but the Oil level is acceptable?

In some cases, you may notice that your oil pressure light is on, but when you check the oil level, it appears to be at the recommended amount. This can be confusing and concerning, but there are a few potential reasons for this occurrence.

• Faulty Oil Pressure Sensor: A defective oil pressure sensor can send incorrect readings to the car’s computer system, triggering the warning light even when the oil level is acceptable.
• Sensor Wiring Issues: In some cases, wiring issues or a loose connection can cause faulty readings from the oil pressure sensor. A certified mechanic can inspect and repair any wiring problems to fix this issue.
• Electrical Problems: In rare cases, the oil pressure light may come on due to electrical problems in the car’s computer system. This can be diagnosed and fixed by a professional mechanic.

In any case, it is essential not to ignore an oil pressure light, even if the oil level appears fine. It’s always best to properly diagnose and address the issue to prevent potential damage to your engine. Regularly checking the oil level, maintaining proper maintenance, and promptly fixing any problems can ensure your engine runs smoothly and efficiently for years.

How Do I Know If My Oil Pump Is Bad?

The oil pump is a critical component of your engine that ensures proper circulation and lubrication of the oil. If you suspect that your oil pump may be wrong, here are some signs to look out for:

• Low Oil Pressure: A failing oil pump can lead to a drop in oil pressure, causing the warning light to come on. This may also cause other symptoms, such as engine noise, rough idling, and reduced performance.
• Engine Overheating: The engine can overheat without proper lubrication from the oil, leading to potential damage. If your engine temperature rises above normal levels, it could be a sign of a bad oil pump.
• Metallic Clanking Noise: A damaged or failing oil pump can cause metal-on-metal contact in the engine, leading to a clanking or knocking noise. If you hear this type of sound, it’s essential to have your engine inspected promptly.

If you notice any of these signs, having your oil pump inspected and replaced is crucial. Neglecting a lousy oil pump can lead to severe damage to your engine and potentially costly repairs.

FAQs

Q: Is it safe to drive with the oil pressure light on?

A: It is not recommended to drive with the oil pressure light on, as this can indicate a potentially serious issue with your engine’s lubrication system. It’s best to have the problem properly diagnosed and addressed before continuing to drive.

Q: Why oil pressure light comes ON when engine is hot?

A: When the oil is heated, it becomes thinner and can result in lower oil pressure. In some cases, this may trigger the oil pressure light to come on. It’s important to regularly check for leaks and ensure your oil levels are always at the recommended amount.

Q: How often should I check my oil level?

A: It’s recommended to check your oil level at least once a month and before long trips. If your car is burning through oil faster than usual, check the status more frequently.

Q: Can low oil pressure damage my engine?

A: Low oil pressure can lead to severe engine damage if not addressed promptly. Without proper lubrication, the engine can overheat and cause wear and tear on critical components.

Q: How can I tell if my engine oil needs to be changed?

A: Following the manufacturer’s recommendations for oil changes is essential, typically every 5,000-7,500 miles. You can also check the color and consistency of the oil – if it appears da k and sludgy, it’s time for a change.

Additionally, pay attention to any strange noises or changes in engine performance, as this could indicate the need for an oil change. Regular maintenance and attention to warning signs can keep your engine running smoothly and avoid potential issues with low oil pressure.

Final Words

If you find the oil pressure light comes ON when engine is hot. Keeping an eye on your car’s oil pressure is necessary for maintaining the health and longevity of your engine. By regularly checking the oil level, addressing any issues promptly, and following the manufacturer’s recommendations for maintenance, you can prevent potential damage from low oil pressure and keep your vehicle running smoothly.

If you are unsure about the cause of an illuminated oil pressure light, it’s always best to consult a certified mechanic for proper diagnosis and repairs. By staying proactive and addressing any issues promptly, you can ensure that your car’s engine remains in top condition for years to come. Remember, regular maintenance is critical to preventing costly repairs in the future. 

Thanks for reading! If you have any other questions or concerns about your oil pressure, please comment below or schedule an appointment with your trusted mechanic. Stay safe and keep your engine running smoothly!