ESP BAS Light – Why Is It On (And How To Reset It For Good)?


The ESP/BAS light indicates issues with the Electronic Stability Program (ESP) and Brake Assist System (BAS) in vehicles. When illuminated, it suggests potential problems with the car's traction, stability, or brake assist functions.

Causes can range from wheel speed sensors, and steering angle sensors, to brake fluid levels. It's crucial to address this promptly to ensure safe driving. Regular maintenance and checks can prevent unexpected illumination of the ESP/BAS light.

Paul Hadley

This article was recently reviewed by car expert Paul Hadley to ensure it is as accurate and helpful as possible.

Are you suddenly noticing the ESP BAS light appearing on your dash? Are you worried that something is wrong with your electronic stability program? While it might just be a warning light, the ESP BAS light concerns the stability of your vehicle, and thus, your safety.

There might be a wide number of reasons why this light may pop up on your dash… It could be a bad steering angle sensor, a faulty wheel speed sensor, a malfunctioning brake switch, or worn-out brake components. The ESP BAS light is the message you get when your brake and stability control system isn’t working as it should.

This light should not light up so often. It usually turns on when the emergency brakes are engaged by the vehicle. But this light is on all the time, it’s a sign that your ESP system needs attention. In this article, we are going to get through all of the causes why this light appears, and the possible fixes concerning the ESP BAS light.

We’re also going to learn some troubleshooting methods (and how to reset the light) or how you can take care of this issue by yourself with a simple OBD2 scanner tool (and learning how to use OBD2 scanner).


Before we get into more complex issues, we need to clear out some basic things first. This light is one of the many warning lights that are found on the dash. This light is created for the specific purpose of giving you immediate alerts and warnings. Or, simple visual cues to signify action or input.

Since it flashes it means that something is engaging. If the light doesn’t turn off it means that the system is not disengaging, and potentially something is wrong with it.

When this specific light is turned on. It means that there is something wrong with the electronic stability program or the brake assist program. It may be something very serious or it may be something really simple to fix. That’s why it needs to be diagnosed first.

The important thing is that you shouldn’t run your car with the light turned on for long. After you have noticed that this light is turned on, you should be making an appointment at the mechanic’s shop as soon as possible.

ESP Light On Dash

When this light is turned on, your safety is jeopardized. I’m saying this because your electronic stability control system and the anti-lock brakes may not engage in an emergency. This will make your vehicle not able to handle the situations on the road as it used to.

This may cause late braking or no braking in some situations. For example, if you are driving behind someone on the road and they hit the brakes all of a sudden. You can clearly see that they’re braking and you start to brake, in response.

Then you will notice that nothing happens, and you might hit that person’s car from behind. So, when you get this light turned on. The best idea is to fix it as soon as possible and drive without worries. Now let’s see what causes this light to appear in the first place.

Electronic Stability Control (ESP) & Brake Assist System (BAS)

Before we get into discussing what the ESP BAS light is, here’s an explainer of what the ESP (electronic stability program) and BAS (brake assist system) respectively do…

1. Electronic Stability Program

The Electronic Stability Program (ESP) is a critical automotive safety technology that helps drivers maintain control of their vehicles, especially under unpredictable driving conditions. This ingenious system is designed to detect and prevent vehicle skidding, thereby reducing the risk of accidents.

It’s not just an upgrade on the antilock braking system (ABS) or the traction control system; it’s an integral system that significantly enhances your vehicle’s safety profile. The ESP actively monitors the vehicle’s direction and compares it with the driver’s steering wheel input.

If the system detects a discrepancy—meaning the vehicle isn’t going where the driver intends—it springs into action. It can individually brake each wheel, thereby correcting the vehicle’s course and keeping it on the intended path.

This feature is especially beneficial on slippery roads or during abrupt maneuvers, helping to maintain the vehicle’s stability and prevent potential skids.

1.1 Symptoms and Causes of ESP Failure

ESP failure is typically indicated by a warning light on the vehicle’s dashboard, often represented by a car icon with skid marks. When this light is illuminated, it signifies that the system has detected an issue, possibly making your vehicle less safe to drive.

Several issues can lead to the malfunctioning of the ESP system. Sensor failure is a common culprit, as the ESP relies heavily on data from various sensors to function correctly. These include wheel speed sensors, steering angle sensors, and lateral acceleration sensors. If these sensors provide inaccurate data or fail completely, the ESP system might malfunction.

Other possible causes include faults in the ABS module, as ESP and ABS are tightly interlinked. A problem in the brake system, such as worn-out brake pads or low brake fluid, could also lead to ESP failure.

1.2 Diagnosing and Repairing ESP System

Diagnosing an ESP issue often starts with using a scan tool to read the fault codes stored in the car’s computer. These codes can give a mechanic a good starting point for the diagnosis.

Once the problematic component is identified, it’s either repaired or replaced. In some cases, simply cleaning and re-calibrating the sensors can fix the problem. Other times, components such as the ABS module might need to be replaced.

In all cases, it’s critical to rectify any ESP issues promptly to ensure the vehicle’s safety.

2. Brake Assist System

The Brake Assist System (BAS) is another crucial vehicle safety feature that’s designed to enhance regular braking. While it doesn’t replace the driver’s braking method, it complements it by providing additional braking pressure when necessary, especially during emergency braking situations.

When a driver presses the brake pedal quickly and forcefully, the BAS perceives it as an emergency situation. In response, it increases the brake force beyond what the driver is applying, thereby shortening the stopping distance and potentially preventing a collision. It’s an active assistant that enhances the braking efficiency in critical moments.

2.1 Symptoms and Causes of BAS Failure

A malfunctioning BAS will typically trigger a warning light on the dashboard, often represented by the letters “BAS.” When this light illuminates, it signifies that the system has detected an issue.

BAS failure can occur due to various reasons. Faulty brake sensors are common culprits, as they monitor the speed at which the brake pedal is pressed and send signals to the BAS. Brake fluid leaks or low brake fluid levels can also affect the system’s performance.

Additionally, issues with the ABS module can cause the BAS to malfunction since these systems are interconnected.

2.2 Diagnosing and Repairing BAS System

A fault code scan is usually the first step in diagnosing a malfunctioning BAS. The scan tool will display the codes stored in the car’s computer, which can guide the mechanic toward the problematic component.

Depending on the root cause of the problem, fixing a BAS issue might involve replacing faulty sensors, topping up or replacing brake fluid, or replacing the ABS module.

As with the ESP, it’s crucial to promptly address any BAS issues to maintain the vehicle’s safety. Repairing or replacing these systems can range from a few hundred to a few thousand dollars, depending on the severity of the problem. However, the cost is justified considering the essential role these systems play in vehicle safety.

So, while it may seem inconvenient when your ESP or BAS light comes on, remember these systems are there to keep you safe. Always take these warning lights seriously and get your vehicle checked by a professional as soon as possible.

What Causes The ESP Light To Come On

There can be plenty of reasons why the ESP BAS light is popping up on your dashboard. By scanning the car’s computer, you can learn a lot and diagnose the problem.

Many secrets can unravel If you have a proper diagnostic tool in your hands. You can get these tools for a cheap price on Amazon and you can diagnose these issues by yourself.

You need some will and free time to learn these things. If you are not into DIY stuff, you can just take the car somewhere where they have one of these tools and they can help to diagnose the problem for you.

Before we get into troubleshooting. Let’s first go through all the major reasons why the car behaves in this strange way.

ESP BAS Light, Possible Causes #1: Steering Angle Sensor

Cars these days are filled with advanced electronics and incorporate different sensors. Because of this many models are plagued by problems. And that’s the case with this sensor. A very simple thing that causes many headaches.

The problem with the steering angle sensor is one of the most probable reasons why you will see the ESP BAS light on your dashboard. This steering wheel sensor is designed to help your steering wheel to work in perfect harmony with the wheels on the ground. This sensor helps insure your wheels are all turning in the right direction.

This sensor is placed inside your steering rack. When an issue occurs may cause the sensor to lose contact, and the ESP BAS light to start appearing on the dash. If the light turns on, it may mean that there is no contact with the sensor, and if it shuts off it means that the contact is engaged again.

You can notice this when you are driving over bumps, or when you are driving through potholes. This sensor is a pain to be taken care of. The best thing to do is to check the connections if they are good. Take an ohmmeter and check the connections. If the readings are good then it’s something else. If the readings are bad, the sensor is broken.

How To Recalibrate The Steering Angle Sensor

You can try to recalibrate the sensor. You can do this by turning the wheel from side to side a couple of times, this will help the sensor to be recalibrated (from lock to lock). If it doesn’t help, it means that the sensor is dead and needs to get replaced.

You can also get an OBD scanner or an auto code scanner in order to reset this sensor through a car code scan. Just give it a quick scan and then check the results that will come up. Fix the errors. It should be ok if the calibration was required and recalibrated, if doesn’t recalibrate, you will need to find a replacement with a new OEM part.

The good news is that this sensor isn’t a pain to replace. If you want to replace it yourself, you need only one wrench. The first thing to do is to unplug your battery. After you make sure that there isn’t power in the car. You can be safe that the airbag won’t explode in your face and you can focus on removing this sensor.

Steering Angle Sensor Replacement

The second thing to do is to remove the airbag from the wheel. You can do this by pressing a clip on the back side of the wheel. After the airbag pops out then you can focus on removing the steering wheel.

First, lock your steering wheel in the dead center. Then get a torque wrench to remove the main bolt that holds the wheel. After you removed the bolt, take a marker and mark the wheel position. This is necessary if you want your wheel to be perfectly straight.

Then remove the wheel, and after that remove the clock spring. The sensor we are looking for is attached to the back part of the clock spring. Remove the bad sensor and replace it with a brand-new one. Then connect everything as it was before. Then mount your wheel and torque the bolt to the right spec.

After these steps, mount the airbag and when it clicks, it means that is ok. Then power on the battery. If you still getting the ESP BAS light then get a code reader and reset the codes. Restart the car and now it should be ok and you are ready to go.


ESP BAS Light, Possible Causes #2: Bad Wheel Speed Sensor

On every wheel of your car, there’s something called a speed sensor that is measuring your average speed. These sensors are part of the ESP BAS systems. The speed sensor makes sure that your wheels are spinning at the right speed.

This helps the ESP BAS system to know when you are losing traction. Loss of traction may happen if you drive on ice, rocks, and similar unstable surfaces.

When you are driving on these surfaces, your sensors are reading different values. The ESP system will start working and put pressure on the wheel that loses traction. This will help to return the stability of the vehicle and keep the vehicle on the road.

This action will turn your ESP BAS light on, but only for a moment. After it disengages it should turn off again and it should stay that way. If the light doesn’t turn off, maybe one of the wheel sensors is bad.

How To Diagnose A Bad Wheel Speed Sensor

Take an OBD scanning tool and connect it to your car computer. Scan the car and some errors should pop up. In the errors, it should be the name of this sensor. The diagnosing tool will tell you on which wheel is this sensor failing and you will have a clearer idea about what you need to do next.

Bad Wheel Sensor Replacement

The sensor is placed right behind your braking discs. It is really easy to get close to it and replace it. It’s not a labor-intensive task and you can do it at your home. To replace the sensor, you will need some tools. These include a ratchet with a socket set, a new wheel speed sensor, a car jack, and safety stands.

Always make sure your new sensor is compatible with your vehicle model. Here’s a quick summary of what this process looks like:

Removing the Old Sensor

Step 1: Start by safely jacking up your car and securing it with safety stands. Never work under a vehicle supported only by a jack.

Step 2: Once the car is secure, locate the faulty sensor. It’s usually mounted near the brake assembly, often with a wire leading to it.

Step 3: Remove the sensor by loosening it with your ratchet and socket. Be careful not to damage the nearby parts.

Installing the New Sensor

Step 1: With the old sensor out, it’s time to install the new one. Position it in the spot where the old sensor was removed.

Step 2: Secure the new sensor in place with your ratchet and socket. Ensure it’s tight but avoid over-tightening, as this could cause damage.

Step 3: Once the new sensor is installed, lower your car safely from the jack stands.

ESP BAS Light, Possible Causes #3: Bad Brake Switch

Something simple as a bad brake switch may also be one of the culprits for this problem. These brake switches are known to go bad on a regular basis. Although manufacturers claim that they last forever. It is a big possibility that once in a while you will need to change it.

How these switches works are pretty straightforward. This switch has a role to turn on the back brake lights when you apply your foot on the brake. This switch is necessary to work. so other people that are behind you will know if you are coming to a stop.

If your brake lights won’t work (like not turning off) it is very probable that someone will hit you from behind. Because of this, please keep this sensor in check.

This sensor is built for this purpose, when it fails will let you know that it’s time to replace it. That’s why the ESP BAS light is turned on and you need to diagnose the issue as soon as possible.

Replacing this sensor is an easy task. It is not labor-intensive work to find it and you don’t need to remove many parts like with other sensors.


Brake Switch Sensor Replacement

First, you need to diagnose the issue with the OBD scanner tool. After you diagnosed the issue get a new sensor. These are not as expensive as other sensors. The sensor is located right above your brake pedal. Just unplug it, and plug the new one in. Reset the codes and you are ready to go.

Here’s a summarized and simplified rundown of what this kind of replacement job entails:

  1. Disconnect the car battery. This ensures safety while working on the vehicle.
  2. Locate the brake switch sensor. It’s typically near the top of the brake pedal.
  3. Disconnect the wiring harness connected to the brake switch sensor. A flathead screwdriver may assist here.
  4. Remove the faulty brake switch sensor. Depending on the vehicle, this may require a wrench.
  5. Install the new brake switch sensor in the same position.
  6. Reconnect the wiring harness to the new sensor.
  7. Reconnect the battery, then start the car and check the brake lights. If they function correctly and the ESP BAS light is off, the problem is resolved.

ESP BAS Light, Possible Causes #4: Worn Out Rotors, Pads, Calipers

These three components are known to go bad and cause the ESP BAS light to show on the dash. Especially frozen or sticking brake calipers. The calipers apply pressure on the pads and could freeze (if they’re old) and cause the light to pop up. Also, worn-out brake pads (you need to change these often) are one of the common issues that cause these problems.

Pads are fairly cheap and easy to find. After all, brake pads don’t always last that long. And at last, are the rotors. The rotors are important for your car to work properly. The rotors can last for 30,000 miles with no problem. Instead of replacing them, you might also consider turning the brake rotors, too.

So, consider that while you’re planning a brake pad and rotor replacement. But they know to warp if too much heat is applied to them. They can also wear and make your brakes unusable. So, changing them on time will be a good idea.

Doing a brake job DIY is a fairly easy process. But first, you need to get familiar with these parts. Watch some YouTube videos on how this work is done on your exact car. Learn more about how these parts go inside and also learn about the overall process of doing a brake job.

What Is A Brake Job

After you did this, you can go to your local AutoZone or any other parts store and look for new brake pads to change into and rotors for your specific car. These need to be specific in order for this to work. If they are not, you will have to return them and replace them. After you got the parts, it is time to get your hands dirty.

Jack up the car and remove the wheels. Unbolt the caliper. This is usually two small bolts from behind and after you remove the bolt. Hang the caliper onto something. You don’t want to leave the caliper like that hanging (unless you’re replacing the brake calipers).

That’s because the brake lines may break (and require replacement). Then unbolt the rotor and bolt the new rotor in. That is if you’re absolutely sure that you can tell that you need new rotors. Also, do give some thought to racier drilled and slotted rotors. Give it a little tap with the hammer if it doesn’t want to come off.

Worn-out brake pads are fairly easy to solve. Just unclip the old brake pads (they shouldn’t always last that long) and apply the new pads inside the caliper. Bolt-on the caliper and you are good to go. While you’re here, be wary of the brake pad material thickness that’s left. If the caliper is stuck. Things may be a bit messy and you will need a tool to flush your braking fluid.

How To Replace The Brake Pads, Brake Rotors, And Brake Calipers

Just for context, here’s a quick rundown of what a replacement job entails:

1. How to Replace Brake Pads

Make sure the issue lies with your brake pads. Look for symptoms like squeaking sounds, less effective brakes, or a warning light on your dashboard. For this job, you’ll need a jack, jack stands, a lug wrench, a C-clamp, and your new brake pads.

Step 1: Safety First

Start by parking on a flat surface. Use the parking brake to ensure the car won’t move while you’re working.

Step 2: Loosen the Lug Nuts

Use your lug wrench to slightly loosen the lug nuts on the wheels.

Step 3: Lift the Car

Next, use the jack to lift the car, then place the jack stands underneath to keep it stable.

Step 4: Remove the Wheel

Completely unscrew the lug nuts and remove the wheel to expose the brake system.

Step 5: Replace the Brake Pads

Loosen the caliper bolts to remove the caliper. Then, remove the old brake pads and replace them with new ones. Apply brake grease on the back of the pads to prevent squeaking.

2. How to Replace Brake Rotors

Let’s move on to replacing brake rotors. These are essential for slowing your car down when you brake. You’ll need a jack, jack stands, a lug wrench, and your new brake rotor.

Step 1: Safety First

Repeat the safety procedures as mentioned above.

Step 2: Remove the Brake Caliper

Once the car is stable and the wheel is removed, you’ll see the brake caliper. Remove this to expose the brake rotor.

Step 3: Replace the Brake Rotor

Remove the rotor by unscrewing the bolts holding it. Replace with the new rotor and tighten the bolts.

3. How to Replace Brake Calipers

Finally, let’s go over how to replace brake calipers. These components apply the necessary force to your brake pads. For this, you’ll need a jack, jack stands, a lug wrench, a line wrench, a C-clamp, and your new brake caliper.

Step 1: Safety First

As always, safety is a priority. Follow the same safety measures.

Step 2: Remove the Brake Caliper

Once the car is raised and the wheel removed, locate the brake caliper. Use the line wrench to disconnect the brake line.

Step 3: Replace the Brake Caliper

Attach the new brake caliper, connect the brake line, and then install new brake pads and rotor if necessary. Make sure everything is tight and secure.

Can You Drive With The ESP BAS Light On

Driving with the ESP BAS light turned on is not safe, and you should not do it. This issue needs to be resolved as soon as possible, in order to keep yourself safe on the road. It may be something simple, but it may be something really concerning. Your ESP system needs to work properly all the time because you never know when you are going to need it.

A bad ESP system may lead you into an accident with big consequences. Traction is necessary for the car to stay on the road. And if these sensors are not working you may lose traction while you’re cornering, or on the snow. You never know what type of driving conditions you may across while you are driving. You need to be always prepared for these things.

Electronic Stability Control Repair Cost

When it comes to price, repairing the ESP BAS light can be a costly job to do. This system is relying on many sensors that need to function, to do its job properly. Depending on what went wrong, the cost may vary.

1. ABS Pump

If the ABS pump went bad you may find yourself having a hard time and it’s going to hurt your pocket. Depending on the make of your vehicle, it may come to a steep price of $800 and it can go up to $1000 to get this work done on your car.

You can save money if you find an old part in good condition. Second-hand ABS pumps usually cost around $200-300 depending on the make and model. If you go with a new one then you will need to pay around $500-600.

Also, the labor will cost you around $200 depending on where you take your car. If you decide to swap the pump by yourself, you will only pay for the ABS pump. I personally wouldn’t recommend you to go for a used part, since you never know when it can fail on you again. Get a new OEM part that will serve you for a long time.

2. Sensors

In order to make your ESP function properly, you will also need working sensors. If one of them has a malfunction you need to replace it as soon as possible. It’s unfortunate that these sensors aren’t cheap and they may cost you a decent amount of money. Money that you already planned to spend on something more fulfilling.

These sensors usually cost $200 and up. Depending on the make and model they can go high. So, the best idea is to search for your sensor from the part number. Because many Lamborghinis for example have Audi parts. So, if you find the Audi part or VW part you will pay a lot less to replace it. So, keep this in mind.


3. Brake Pads And Rotors

Brake calipers, brake discs, and brake pads. These parts are also a necessity when it comes to braking and controlling your car on the road. Warped discs may ruin your braking distance and they are a major cause for ESP BAS light to appear on the dash.

The calipers are rarely replaced, but sometimes they can get stuck and they need to be changed. They may cost from $200+ per brake caliper. Discs are cheaper coming at around $100+ per wheel.

Brake pads are really cheap at $25+ each, but you definitely shouldn’t go for the cheapest options. These are pads made from bad materials (unlike organic or ceramic brake pads). Then again, you don’t really need super-expensive carbon ceramic brake pads, either.

And, they’re known to start squeaking after you install new brake pads and cause some unpleasant grinding noise when braking (even if the pads are fine). So, go for a more quality brand in order to avoid some headaches.

How To Reset ESP BAS Light

The Electronic Stability Program (ESP) and Brake Assist System (BAS) are crucial components in modern cars. These systems work in tandem to enhance your vehicle’s stability and assist in braking, respectively.

When your ESP BAS light comes on, it signals that there’s an issue with these systems. While it can be an annoying sight, it’s crucial to understand that this is your car’s way of telling you something needs attention.

Before we dive into the resetting process, remember, if your ESP BAS light is on, it could be an indication of a significant issue with your vehicle’s stability or braking systems. Therefore, it’s imperative not to ignore the signal and seek professional assistance if necessary.

It’s important to note that resetting the ESP BAS light without diagnosing and resolving the root cause is not advised. However, sometimes, the light can trigger due to a temporary glitch or after a battery replacement, and a simple reset can rectify this. If the light comes back on after resetting, it’s highly recommended to have your car checked by a professional.

1. The Simple Steering Wheel Method

The first method for resetting your ESP BAS light involves no special equipment, just a careful use of your steering wheel.

  1. Start Your Engine: Get into your car, start the engine, but keep it in park. Ensure you’re in a safe and flat location where you can do this comfortably.
  2. Turn the Steering Wheel: Gradually turn your steering wheel all the way to the right until it can’t go any further. Next, turn it all the way to the left.
  3. Repeat: Repeat the above step two to three times. This process is designed to recalibrate the steering angle sensor.
  4. Reset: Finally, straighten your wheels to a normal position and turn off your car. Wait for a minute and restart your engine. Your ESP BAS light should have turned off.

2. Using an OBD2 Scanner

If the simple steering wheel method doesn’t work, it’s time to bring in some technology. For vehicles manufactured after 1996, an OBD2 scanner can be a useful tool to diagnose and reset error codes, including your ESP BAS light. Here’s how:

  1. Locate the DLC Port: This is typically found underneath and to the left of your steering wheel.
  2. Connect the OBD2 Scanner: Once located, connect your OBD2 scanner to the DLC port.
  3. Navigate the Scanner: After you’ve connected your OBD2 scanner, enter the necessary information and navigate to the “systems” or “control unit” section.
  4. Find and Erase Codes: Locate ESP BAS within your scanner’s menu and select “erase codes” or “reset codes.”
  5. Monitor: After performing the above steps, the warning lights should disappear. If your ESP BAS light reappears, it indicates that the problem hasn’t been resolved and needs further attention.

3. After the Reset

If you’ve successfully reset your ESP BAS light, it’s crucial to keep a close eye on your dashboard. If the light reappears, don’t ignore it. Visit a trusted automotive professional to diagnose and rectify the problem.

Remember, your ESP and BAS systems are critical safety features in your vehicle. While this guide provides steps to reset your ESP BAS light, it’s essential to understand that this is a temporary solution to a potentially larger problem. If your light comes back on, it’s an indication that your car’s safety systems need professional attention.

4. Cautionary Notes

These instructions are intended for informational purposes and do not replace professional automotive advice. If you’re unsure about any aspect of this process or if the ESP BAS light comes back on after a reset, seek help from a qualified professional.

Your car’s ESP BAS light is a crucial indicator of potential problems with your vehicle’s safety systems. While you can reset the light, it’s essential to ensure that any underlying issues causing the light to illuminate are properly addressed. As always, your safety is paramount, so when in doubt, reach out to a professional.

Jeep ESP BAS Light: Facts You Need to Know

  • The ESP BAS light on a Jeep provides better control over the vehicle in adverse conditions and indicates trouble in the Electronic Stability Program or Brake Assist Program.
  • If the ESP BAS light stays on for a prolonged time while driving, it indicates an issue with the Jeep, and it should not be ignored to avoid any danger or greater permanent damage.
  • Defective brake switch, defective wheel speed sensors, and defective steering angle sensors are specific reasons why the ESP BAS light turns on.
  • The brake switch activates the brake lights while driving and warns other vehicles when the vehicle will slow down. The wheel speed sensors track the spinning rate of the wheels and recalibrate them when they move at different speeds. The steering angle sensors move the wheels to the left and right using the steering wheel.
  • To turn off the ESP BAS light on a Jeep, the problem needs to be identified first, whether it is with the steering wheel sensor, wheel speed sensor, or brake switch.
  • To fix the defective steering angle sensors, turn on the engine of the Jeep, turn the steering wheel twice to the right and then two times to the left, and return the steering wheel to the center so that the tire faces forward.
  • Defective wheel speed sensors and brake switches can easily be replaced with new ones at an affordable cost.

ESP BAS Light: In Conclusion…

The ESP and BAS systems are an important part of your vehicle’s overall safety. With these systems, thousands of crashes are avoided on a daily basis. And also, many people are still alive because of them.

Having a working safety system is essential in your vehicle. If you see an ESP BAS light that lightens up and doesn’t turn off, it means something went bad and you should take care of it. If you are into mechanics, you can get an OBD scanner and diagnose the issue. Check out the codes and search for them online. You will find plenty of solutions.

If some sensor is bad then you need to replace it. If the ABS pump went bad then you should replace it with a good used one or a brand-new pump. To go for a new part is the best thing to do.

If the brake rotors are bad and all warped and the caliper is stuck replace them with new ones. Don’t go cheap and try to get these parts used. Since they are for sale, it means that something is wrong with them. Yet, if they’re not too badly damaged, you could resurface the brake rotors.

The bottom line is, you should never leave unsolved problems in your car. Take care of all the systems and you will save more money in the long run. Because if you delay these things. You will pay more when the issues spread over time.

Frequently Asked Questions

If you’re still curious to learn more about the ESP BAS light, our FAQs here might help…

What Does ESP Stand For

In your car, ESP stands for Electronic Stability Program. Some vehicles might label or name this system differently, such as ESC (electronic stability control) or VSC (vehicle stability control), and so on. But in general, the ESP is a computerized system that keeps track of your car’s movement and can take control if needed to ensure that it could safely travel down the road. For example, let’s say that your car is losing traction and slipping out of control. In this instance, the ESP combines the function of a car’s traction control system and anti-lock brakes. In doing so, the ESP can intervene to apply braking force, or control how much power goes to each wheel, and more.

What Is The Meaning Of 4MATIC

If you’re familiar with Mercedes or own one of its cars, then you might’ve heard the term 4MATIC before. This is what Mercedes calls its all-wheel drive system. Essentially, it functions to deliver your engine’s power and torque not only to the front or rear wheels alone. But, 4MATIC allows power and torque to be split across all four wheels. This can help to improve traction significantly compared to powering just two wheels (either front or rear-wheel drive). You’ll especially notice the difference in grip if you’re driving while it’s snowing outside, over a frozen road surface, or even taking your Mercedes off-road. Other automakers’ AWD systems also have similarly catchy names as 4MATIC.

How To Reset Dashboard Lights

The easiest way to reset dashboard lights – which are prompted to appear by your car’s ECU (its central computer system) – is by disconnecting the battery. So, pop open the hood, and remove the negative terminal of your car’s 12V battery. Now deprived of a power source, leave it be for 10 minutes. This should be more than enough time for the ECU to be drained of any residual power, thus resetting it completely. Finally, reconnect the negative battery terminal, and turn your ignition on again. It’ll help to take your car out for a short test drive afterward. Last, but not least, check to see if any warning lights (such as the check engine light) are lighting up again after the reset.

What Does BAS Stand For

Some cars come with something called BAS or BA. They both stand for Brake Assist System or Brake Assist, which was first pioneered by Mercedes. Their primary function is as an aid for the car’s regular braking system in the event that it detects an emergency braking. It does so by reading signals and input from your accelerator sensor, brake sensor, and ECU. Therefore, when you press the brakes hard to try and avoid something, the BAS can detect that something is amiss. As such, the BAS will prompt the ECU to start increasing braking pressure – in some cases, beyond the nominal pressure threshold of an ABS system. With that in mind, that should help you to brake more effectively.

How To Reset ESP BAS Light

Should you notice an ESP BAS light error lighting up on your dashboard, just know that you can do something to make it go away. In some instances, all it takes are some simple steps to reset the ESP BAS light entirely. First, start up your vehicle, and shift into Park. Once that’s done, turn the steering as far as you can turn it to the right. Then, repeat the latter process, but this time, turn all the way to the left. Repeat it a few times, before then turning off the ignition. Finally, try restarting your car again, and see if the ESP BAS light is still there. Typically, these simple steps should reset it, but otherwise, you might need to conduct a more thorough diagnosis.

What Is ESP

Electronic Stability Program (ESP) is a computerized technology that improves a vehicle’s stability by detecting and reducing loss of traction. When ESP detects loss of steering control, it automatically applies the brakes to help ‘steer’ the vehicle where the driver intends to go. Braking is automatically applied to wheels individually, such as the outer front wheel to counter oversteer, or the inner rear wheel to counter understeer.

What Is ESP on Mercedes

In Mercedes-Benz vehicles, the Electronic Stability Program (ESP) functions to control the car’s traction. It detects if the vehicle is losing grip and automatically applies the brakes to help stabilize the vehicle and keep it on its intended course. Additionally, if the vehicle starts to spin, the ESP reduces engine power and applies the brakes to individual wheels to help regain control.

What Does the Car with Squiggly Lines Light Mean

The car with squiggly lines light is the symbol for the vehicle’s Electronic Stability Program (ESP) or traction control system. When illuminated, it means the system has been activated due to poor traction, or it may indicate a malfunction within the system itself. It’s typically accompanied by the vehicle feeling slightly unresponsive or behaving differently than normal to prevent skidding or slipping.

Can Worn Brake Pads Cause ABS Light to Come On

Yes, worn brake pads can cause the Anti-lock Braking System (ABS) light to come on. The ABS system relies on input from various sensors to function correctly. As the brake pads wear down, the distance between the brake pad and the rotor changes, which can cause the wheel speed sensors to provide inaccurate data, triggering the ABS light.

What Causes the ESP Light to Come On

The ESP light can come on due to several issues including a malfunctioning wheel speed sensor, steering angle sensor, or brake pressure sensor. It can also illuminate if there’s an issue with the brake switch or if the system detects abnormal tire pressure. In some cases, a faulty battery or damaged wiring can also trigger the ESP light.

How to Reset Traction Control Light Jeep Wrangler

To reset the traction control light on a Jeep Wrangler, first, turn the ignition on without starting the engine. Press the ESP OFF button for at least four seconds but no more than 10 seconds. Release the button, then start the engine. If the light still doesn’t reset, a diagnostic scan tool may be required or there could be a more serious issue that needs professional attention.

What Does the ESP Program Do

The Electronic Stability Program (ESP) enhances the vehicle’s stability by detecting and minimizing skids. When the ESP identifies a loss of steering control, it automatically applies the brakes to specific wheels, helping direct the vehicle where the driver intends. The ESP may also reduce engine power until control is regained.

Where Is the ESP Sensor Located

The ESP sensor, more accurately called the steering angle sensor, is typically located in the steering column behind the steering wheel. It measures the direction and rate of rotation of the steering wheel, providing critical data to the ESP system. However, the exact location can vary based on the vehicle’s make and model.

How to Reset Traction Control Light Ram 1500

To reset the traction control light on a Ram 1500, first, turn the ignition to the ‘on’ position but don’t start the engine. Then, fully press the gas pedal, slowly, three times within 10 seconds. Now, turn the ignition off. The light should be reset when you restart the vehicle. If the light remains on, there may be a problem requiring professional diagnosis.

How to Reset Traction Control Light Dodge Journey

To reset the traction control light on a Dodge Journey, you can try turning the vehicle off and restarting it. If the light stays on, the next step would be to try the ‘gas pedal’ method similar to the Ram 1500. If the light continues to stay on, there may be a fault in the system and it’s advisable to take it to a professional for inspection.

How to Reset Electronic Stability Control

Resetting the Electronic Stability Control (ESC) typically involves turning the vehicle off and back on. In some vehicles, there’s a dedicated button to manually turn the ESC on and off. However, if the light remains on after restarting, there could be an issue with the system that needs professional attention.

Why Does My Car Say Brake in Red Letters

If your car’s dashboard displays ‘Brake’ in red letters, it’s a warning indicating a potential issue with the braking system. It could mean that the parking brake is still engaged, brake fluid levels are low, or brake pads are excessively worn. More serious issues could include a leak in the brake lines or a failure in the brake system. It’s recommended to have your car inspected immediately when this warning appears.


  • Mark Erwin (industrial designer) Says

    Very thorough and very well written. I would just add that brake rotors have a minimum thickness specification and that repairs done to steering, brakes and suspension is always done to both sides of a vehicle. Expensive brake pads have a gum or glue to stop the brake pad Squealing. Cheap brake pads do not have this but you can buy it just look up disc break antisqueal on the internet.

    • Zack Norman Says

      Thanks for the comment, Mark Erwin (industrial designer)!

      Cheers for the added insight and explanations! Agreed 100% with this; hope a fellow commenter will find your guidance useful, too 🙂

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