Do you perceive a burning smell coming from your car? It’s always a bad sign, and you should act immediately.
You may perceive a burning smell in your vehicle for several reasons. These include brake overheating, electrical issues, burning oil, coolant leaks, faulty heater, etc. Burning smells are often a sign of an underlying problem in the car.
Some of these issues may vary from very severe to mild. For instance, if the burning smell is caused by an electrical problem, that constitutes a fire hazard, and you should immediately shut down the car to fix the issue.
On the other hand, you may perceive a burning smell from applying the brakes too hard when driving fast. This issue is less serious than those mentioned earlier.
In this article, I will help you identify some of the causes of burning smells from cars, ranking them from severe to mild. In addition, I will identify the types of burning smells and recommend remedies to eliminate the smell from your vehicle. Have a great read!
What Is Burning Smell From Car?
The burning smell from a car is no different from any other burning smell. It is generally Smokey, and well, burnt.
But in a vehicle, the smell can vary depending on what is burning in your car. In fact, if you know how to differentiate them, you can spot what is wrong, just by taking in the burning smell from car.
If the burning smell from car has a hint of candy or maple-syrup like sweetness, it may be the coolant. Or, if it smells like soot or fumes, your vehicle may have an exhaust leak. But, no matter what the smell is, the burning smell from car is not a situation to take lightly.
It means that the issue has gone to its extremes and has taken its most dangerous form. In almost all such cases, you should not drive the vehicle.
If the driver does not heed this strong final warning, he or she will have to deal with huge repair bills, but, more importantly, also a hazard to their life.
So, before we start digging into the types of burning smell from car, let us list out and learn about the causes. This will also prepare us to deal with them, if and when it happens.
Types of Burning Smell from car
Another way to identify the cause of a burning smell from a car is by the type of burning smell you perceive from your vehicle. Some burning smells are like burning rubbers or burning papers. Here are six types of burning smells and their meaning:
#1. Burnt Rubber Smell.
If your car smells like burnt rubber and shakes, then the cause is most likely a slipping belt. The belt of your car is mostly made of rubber and is responsible for transferring power from the engine to other components.
It mostly synchronizes the movement of the camshaft. When the belt slips, friction occurs, and the vehicle begins to shake.
Other causes of the burning rubber smell include friction on a tire, a bad AC compressor, etc. A new car may also smells like burning rubber, but this should only be temporary.
#2. Burning Plastic smell.
A Burning plastic smell should be taken very seriously and indicates wiring issues in the car. In addition, a blown fuse, short wire, or other electrical issues are the major cause of this smell.
Sometimes the burning plastic smell may be caused by irregular voltage from a bad battery or alternator, or rats and rodents may eat the wirings, causing them to be short.
#3. Burning oil smell.
This smell typically comes from outside of the vehicle. This is when oil leaks from the engine and comes in contact with the hot part of the engine.
Oil leaks are easy to spot as they leave stains and puddles where they occur. You may perceive the smell from the exhaust, engine parts, valve cover, drain plug, etc. Oil leaks should always be addressed!
#4. Acrid smell.
Acrid smells are stronger and awful smell in car. They are the smells you perceive from a seized brake caliper or rotor and the clutch.
When these parts are seized or not working properly, there is increased friction and overheating. The smell is also comparable to burning newspaper or heated metal. Once noticed, I recommend you should address the issue quickly.
#5. Burnt toast smell.
If your car heater smells like burnt toast, the vents are clogged with dirt and must be thoroughly cleaned.
Another cause of the burnt toast smell could be electrical shorts. Overheated insulation and burnt wear should be attended to urgently as it can result in fire.
#6. Burnt Marshmallow or sweet smell.
Burnt marshmallows or sweet smells come from heated fluids such as transmission, coolants, and steering fluids. These smells are more pleasing but can be hazardous to health.
To understand these smells, if you perceive a marshmallow-like burning odor, you should check for a steering fluid leak in the car.
Also, inspect your vehicle for coolant leaks if you perceive the sweet syrup smell. And if you perceive a tart smell in the car, you most likely have a transmission fluid leak.
Common Causes of a Burning Smell in Cars
A vehicle has a large number of electrical, mechanical, and electronic systems in it. Some of these components can fail to the extent that it grows into a fire risk.
Burning smell from car can mean the failure of any of these components. So it is necessary that we understand what can possibly go wrong in these cases.
It is not easy to diagnose the root cause of a burning smell. But having a fair knowledge about all the causes can make the process easier, and prepare you better to deal with it.
In fact, it will also prevent you from using unfavorable methods to deal with the issue which can create an even more dangerous situation.
So here is a list of things that may have gone wrong, if there is a burning smell from car.
#1. Electrical Short Circuit.
It is to no one’s surprise that electrical short circuits appear at the top of this list. These are the most common cause of automotive fires. This has become more illuminated as electric vehicles capture more and more of the limelight.
Instances of electric car fires are found across the world but with proper thermal management software and secured connections, EVs are believed to be no worse than internal combustion-powered cars when it comes to fire risks.
But the fact is, IC-engine powered or an EV, every car is prone to electrical fires. Outdoor machinery like a car deals with all the natural elements, rain, sun, or snow.
The insulation from these elements can wear away after long years of operation, exposing the critical elements of the electric circuit.
Electric short circuits can be caused by many other factors as well. These include fitting improper aftermarket accessories, rodent bites, accidents, and more. But whatever the cause is, electrical short circuits can wreak havoc under the skin of your car.
The burning smell from car caused by an electrical short is quite distinguishable. It produces a peculiar burning smell from car that can be quite strong.
If the short is large enough, it can also emanate smoke into the cabin (which might help if you know how to get rid of smoke smell in car). If you ignore these symptoms, a local short can burn the surrounding areas and damage more components.
#2. Burning Smell From Car Brakes.
This is something you may have already experienced. Brakes use friction to stop the vehicle. When the brake pads press onto the rotor, it is no wonder that it will produce a lot of heat. Hence, some burning smell from car will show up.
This becomes especially apparent when you perform hard braking at high speeds. This time, the pressure and the resultant friction are so high that the smell is also exponentially potent.
The heat on the rotor and brake pads can be elevated to such levels that you can even see smoke coming out of them.
But this is a common occurrence and a part of the standard working procedure of the vehicle brakes. If the brakes overheat and produce a bit of smoke, stopping the vehicle to cool it off will do the job.
If it is not that serious, you can keep driving, and the passing air can easily cool them. But this kind of burning smell from car can be a little too risky on certain occasions. This happens when you have a stuck brake.
#3. Broken Accessory Belt.
The accessory belt or serpentine belt of a car is an important component that utilizes the power from the engine to run your water pump, AC compressor, and power steering pump if your car has a hydraulic power steering.
With such an important duty on its shoulder, it is understandable that if it fails, it brings all these systems down.
But when does it create a burning smell from car? The belt, if broken can get stuck between the pulleys and brush against other components. This smells like burning rubber because that is what it is made of.
Serpentine belts are to be replaced at prescribed intervals. A failure in that can end up eating into the life of the belt and wear it out till the point it breaks.
As the belt breaks, it can not only burn out to create a burning smell but also cause the peripherals to stop working. You may not have power steering support if your vehicle has hydraulic power steering. This can make it hard to steer.
You will also lose the air conditioning, as the AC compressor takes power from the engine through the serpentine belt. But this is merely an inconvenience than a problem. The most unsafe outcome from this is connected to the water pump for car.
As the water pump supplies coolant through the engine, a failure in its operation can easily overheat the engine. Driving for long with a broken belt can severely overheat the engine. This will add more to the burning smell from car.
It is necessary to monitor the health of your serpentine belt and replace it whenever necessary. Taking a risk with the same is never a thing to tolerate.
#4. Fluid Leaks.
Fluid leaks can be the reason for different kinds of burning smells, depending on which fluid is leaking. But with any kind of fluid, you should not ignore the burning smell from car. Beyond the smell, it can also mean disaster for many different components in your car.
The major fluids that can leak and create a burning smell from car include the coolant, engine oil, transmission fluid, or power steering fluid if your vehicle has a hydraulic steering setup.
Most of these fluids have their own distinctive smell. This makes it easy to spot the issue quickly.
For instance, if you get a maple syrup-like smell from your car, you can be certain that it is coolant burning.
But it does not always mean a leak. If you overfilled the coolant and it came in contact with the hot engine parts, it can ignite and burn. A leak will have the same effect as well.
But if the burning smell from car has hints of oil burning, it is obviously engine oil. The engine oil can leak from anywhere in the system.
It can be from a drain plug or from a valve gasket or any other component. But the oil burns when it comes in contact with the hot engine parts, especially the exhaust manifold.
The burning smell is not just an odor here. In this case, it is an early indication of a catastrophic engine failure. If a driver ignores this and drives the vehicle with no oil in it, the engine will overheat and fail.
#5. Exhaust Leak.
The exhaust of a vehicle carries the burnt fuel and gases out of the engine and into the atmosphere. Any leak in this path will obviously let these gases out prematurely.
These gases may seep into the cabin and cause you to feel a particular smell. But it is more than just a burning smell from car. Instead, you will experience the smell of leaked gas.
More than the smell, an exhaust leak can contain a greater danger. Pollutants. As the exhaust gases contain carbon monoxide, it is toxic to inhale it. It becomes even more acute in a completely closed space like the cabin of a car.
If you suspect an exhaust leak, the first thing to do is roll down the windows. This will prevent the carbon monoxide concentration from spiking to dangerous levels. Stop the vehicle safely and tow it to the nearest garage or dealership.
#6. Burnt Clutch.
Here is one cause that is exclusive to stick shifts. A common burning smell from such cars is the clutch burning in a stick shift.
If you drive a manual transmission-equipped vehicle on a steep slope, you may have to play with the clutch pedal to eke out enough torque to climb it. This is more evident in engines with less power.
In these situations, drivers use a technique called half-clutching, which burns the clutch. This is not a recommended way to drive on a slope but in some situations, it may be necessary.
The burnt clutch can produce a distinctive burning smell. But this is nothing to worry about, at least at that moment. But continuing to drive on the half clutch can wear out the clutch quicker than it is used to.
#7. Debris Inside Heater.
If you experience a burning smell from car only when you turn the heater on, you can be sure of finding something inside it.
It can be insects (it helps to learn how to get roaches out of car), candy wrappers, old rags, paper bits, or even Q-tips that some people use to clean the vents.
Anything caught inside the heater vents can burn when the heater is on. This will create a burning smell that is easily noticeable inside the cabin. A thorough clean of the air conditioning system can get rid of this issue.
#8. Old Fluids.
The fluids in a car are slated to be changed after stipulated intervals. Be its motor oil, power steering fluid, coolant, or any other fluid, none of them is excepted from this mandatory procedure.
Even the transmission oil, which is usually “filled for life” may need a change after many years of operation.
Leaving these fluids unchanged for longer than recommended, will degrade their efficiency.
This drastic drop in their efficacy can end up damaging your vehicle. Especially if it is the engine oil or coolant, old fluids like these may not be able to cool the car properly, hence overheating it.
An overheated engine, transmission, etc. can be the source of a burning smell from car. Replacing the fluids as per the manufacturer’s specified intervals is extremely important. Adhering to these guidelines can prolong the life of your car.
#9. Burning Smell From Car AC Compressor.
The compressor forms the heart of the air conditioning system, and any failure in its operation will cause the complete system to collapse.
This can also trigger a burning smell from car, especially when you turn on the air conditioning system. In almost all vehicles, the AC compressor is driven via an accessory belt.
We have discussed in detail how a worn-out accessory belt can end up creating a burning smell from car. The same applies to the AC compressor as well. If the compressor sticks, its pulley will not rotate along with the belt.
This holds up the belt, which will then brush against the stuck pulley. Friction from this fast movement will cause a lot of heat and of course a burning smell from car.
A stuck belt is not the only way a faulty AC compressor can create a burning smell. In some cases, the AC compressor may not get stuck at all. It will keep on getting driven by the belt even when it has a problem inside it.
The damaged components will keep on spinning inside the compressor assembly. The vigorous spinning of these can generate an awful lot of friction, and heat as a result, burning them. A burning smell from the car is expected in this case as well.
#10. Tire Smoke.
Well, this is one burning smell from car that at least some of us intentionally enjoy. Throwing too much power to the tires, more than what it can handle will end up spinning them without going anywhere.
Some of us call it burnout, some others call it a waste of rubber, depending on how you look at it.
No matter what you call it, it will produce a burning smell from car. Apart from the waste of rubber, it produces more wear to your clutch, and brakes, and is nothing short of a spectacle.
But this can also be triggered unintentionally. Especially if you are driving a stick shift with an underpowered engine on a slope.
This will need a lot of revving (if you know how to rev a car) and proper balancing from the clutch. If done wrong, the tires can screech on the ground with no friction and produce smoke.
This was a comprehensive list of possible causes of burning smell from car. Armed with this information, you will be able to conduct a preliminary diagnosis.
If it is a minor issue, maybe you can get your DIY gloves on and get to work. But in most cases, you will need a trained mechanic to sort the issues out and ensure the long life of your vehicle.
How do you fix the Burning smell from the car?
There is no one way to fix the burning smell coming from your car. You will need to rely on the knowledge you have gained from this article, including your ability to diagnose the cause and trace the smell.
You can follow these easy steps to help you diagnose and fix the burning smell in your car:
- Identify the type of smell: You should ask yourself what kind of smell you perceive from your car. Some of the smells have been discussed above.
- Identify the cause of the smell: Once you have identified the type of smell, it will help you pinpoint the exact cause of the smell. For instance, burning oil odor may be traced to oil leaks from the valve cover gasket, etc.
- Check short circuits: If you perceive burning plastic or wires, the first step is to inspect the electrical components and wiring for shorts or damage.
- Check for Fluid leaks: Fluid leaks have been identified as one of the causes of the burning smell in the car. Check for transmission fluid leaks, steering fluid leaks, and other leaks that may occur in the car.
- Inspect and replace damaged components: Inspect wiring, electrical components, clutch, brake pads, and other components you suspect may be causing the burning smell. You may need to replace these parts.
Preventing Burning Smells in the Future
Regular maintenance is the key to avoiding burning smells when using your car’s heat.
Here are some preventative tips:
- Stick to a Maintenance Schedule: Follow your car manufacturer’s recommended service intervals to keep all components in good condition.
- Inspect the Heating System: Periodically check the heater core, cabin air filter, and related components for dirt or damage.
- Monitor Fluid Levels: Keep an eye on oil, coolant, and other vital fluids to prevent leaks.
- Clean the Engine Bay: Remove dirt and debris to reduce the risk of burning smells from contaminants.
How Much Does It Cost to Fix a Burning Smell?
Fixing a burning smell costs $100 to $2,500 based on the broken part. An oil leak fix runs $150 to $600. A new serpentine belt costs $100 to $300.
New brake pads cost $150 to $400 per axle. A full clutch job costs $500 to $2,500. A heater core fix costs $500 to $1,200. An electrical fix costs $100 to $200 just to find the short.
| Car Problem | Cost to Fix |
|---|---|
| Oil leak repair | $150 – $600 |
| Belt replacement | $100 – $300 |
| Brake pad replacement | $150 – $400 |
| Electrical diagnosis | $100 – $200 |
| Clutch replacement | $500 – $2,500 |
| Heater core fix | $500 – $1,200 |
Can I Still Drive with a Burning Smell?
You can drive only if the smell is very faint and fades fast. You must stop driving if you smell sweet syrup or plastic.
These smells mean a bad fire risk. An oil smell means drive a few miles to a shop. A brake smell means pull over and wait 30 minutes. Call a tow truck if you feel unsure at all. Read AAA car safety tips for more help on the road.
FAQs.
Q: Can overheated brakes cause a burning smell?
Yes. Brakes naturally generate heat, especially during heavy stopping or downhill driving. However, a persistent burning smell may indicate dragging brakes or a stuck brake caliper keeping constant pressure on the rotor.
If the smell doesn’t fade quickly or your vehicle pulls to one side while braking, have your braking system checked by the technicians at Firestone Complete Auto Care.
Q: Could a recent oil change cause a burning smell?
Yes. Sometimes a small amount of oil spills onto engine components during an oil change and burns off once the engine heats up.
This smell is usually temporary and fades after a short drive. However, if the odor persists for several days, there may be an oil leak or an improperly sealed filter, which should be inspected.
Q: Why does my car smell like burning after sitting in traffic?
Stop-and-go traffic places additional heat and stress on your engine, transmission, and brakes. If your cooling system, belts, or brakes are already struggling, the extra heat buildup may make burning smells more noticeable.
Persistent odors in traffic can be a warning sign that a component is overheating or beginning to fail.
Q: Where can I get my car inspected for a burning smell?
If your car smells like burning, the technicians at Firestone Complete Auto Care can help identify the source. Inspections can uncover issues such as fluid leaks, worn belts, dragging brakes, or electrical faults before they become more serious repairs.
Final Words
Burning smell from car often indicates serious issues with the vehicle, like short circuits, leakages, damaged transmission, etc.
Promptly addressing the issue helps prevent further damage to the car and avoid costly repairs. We recommend regular vehicle maintenance, such as oil and fluid changes, to help identify problems before they develop.