Car Overheating Check Engine Light

Last Updated on June 22, 2023 by Ryan

If the car’s check engine light is on and it is also overheating, then this could indicate a serious issue with the vehicle. The most common cause of both of these symptoms is a problem with the cooling system. This could be due to an issue with the radiator, water pump, thermostat or any other component in that area.

If coolant levels are low or if there is an obstruction causing poor circulation, this can lead to the engine running too hot and triggering the check engine light. To correctly diagnose and repair this issue you should take your car to a qualified mechanic as soon as possible so they can evaluate what needs to be done.

If your car’s check engine light is on and you’re also experiencing signs of overheating, it is important to take action immediately. Overheating can cause long-term damage to your engine and other components in your vehicle. Make sure to pull over as soon as possible and turn off the engine until one of our qualified technicians can take a look at it and diagnose the problem before further damages occur.

Most Common Symptoms of Bad Engine Coolant Temperature Sensor | Signs of failing ECT sensor

Check Engine Light Still on After Filling Coolant

If the check engine light remains on even after you’ve filled up your coolant, it is likely that there’s an underlying issue with your vehicle. It could be a faulty sensor or hose, which can cause the warning light to illuminate. If this happens, it’s important to take your car into a mechanic as soon as possible in order to identify and address any potential problems before they become more serious.

Check Engine Light Cooling System

The check engine light (CEL) is a warning indicator that often comes on to alert motorists about potential issues with the cooling system, such as when coolant levels are low or when the radiator fan isn’t working correctly. If your CEL has illuminated, it’s important to have your vehicle inspected by a qualified mechanic to determine the cause and get any necessary repairs completed before continuing to drive.

Symptoms of Engine Damage from Overheating

When an engine overheats, it can cause serious damage to internal components. Some of the most common symptoms of this type of damage include a decrease in performance and power, white or blue smoke from the exhaust pipe, rough idling, knocking noises coming from the engine, oil contamination with coolant or watery residue on spark plugs and plug wires, misfiring cylinders, grinding noises when starting up the engine and corrosion around cooling system components. It is essential to address these problems immediately before further damage occurs.

Can Coolant Leak Cause Check Engine Light

A coolant leak can cause your check engine light to come on. This is because the coolant leaking from the system can lead to reduced engine performance and possible damage due to overheating. It’s important to have a professional inspect for any leaks as soon as possible when you see your check engine light go on, since a small leak now could result in major repair expenses later if left unchecked.

Car Overheating Check Engine Light


How Do I Know If My Engine is Damaged from Overheating?

If your engine has overheated, it is important to inspect the condition of its components. Signs that your engine may have sustained damage include a burning smell, oil discoloration or sludge in the pan and radiator, excessive smoke coming from the exhaust pipe, visible coolant leaks near the engine block or hoses and a knocking sound when trying to start it up. If you observe any of these signs then it is likely that your engine has been damaged from overheating and needs repairs before starting again.

Additionally, if there are any unusual noises such as squeaking or grinding coming from within the engine itself then this could be an indicator of further damage as well.

How Do You Fix a Car That Overheats?

If your car is overheating, the first step in addressing this issue is to identify the cause. Common causes include a low coolant level, an old or defective radiator cap, clogged hoses and radiators, damaged fans and fan belts, faulty thermostats, or a broken water pump. Once you have identified the source of your overheating problem you can begin to address it by adding coolant if necessary and checking for blockages that could be causing poor circulation.

If more extensive repairs are needed such as replacing hoses or a water pump then it’s best to take your car into an auto repair shop where they can diagnose and fix the issue quickly and safely.

How Much Does It Cost to Fix an Overheated Engine?

The cost to fix an overheated engine depends on the severity of the issue and which components need to be replaced. Generally, you can expect labor costs in the range of $50-$100 per hour, plus additional parts such as gaskets or hoses that might be necessary. If your engine has suffered extensive damage due to overheating—including warped cylinder heads or a seized crankshaft—then it could run into hundreds or even thousands of dollars for repairs.

The best way to ensure a quick and affordable repair is by taking proactive steps like checking your coolant levels regularly so you can catch any potential issues before they become serious problems.


In conclusion, car overheating and the check engine light are both signs of potential trouble with your vehicle. If you encounter either one of these issues, it’s best to take your car to a mechanic as soon as possible in order to prevent any further damage from occurring. By taking swift action, you can avoid costly repairs and keep your car running smoothly for years to come.


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