Can I Jump Start a Kona Electric? Top Tips to Follow. 12v battery reset Hyundai

Can I Jump Start a Kona Electric? Top Tips to Follow!

Every driver suffers from a flat battery at some stage, and the go-to solution is a boost start from a donor vehicle, but what if you drive an EV? Can we just jumpstart a Kona EV to get it running? I’ve been a mechanic for 25 years. Let’s look at the dos and don’ts of jump-starting your Kona EV. Kona Electric 12V battery can be jumped. The high-voltage battery can’t be charged using jump cables. In this article, we’ll look at how you can jump your Kona, why you need to, and items that need to reset after jumping.

How to Jump-Start a Kona EV

Unlock the car

Well, that sounds straightforward enough. However, your 12V battery is dead, and it controls the locking and unlocking of your car. The locks are now unresponsive to your Smart key. Thankfully your Smart key also includes a mechanical key.

To remove the mechanical key:

Then proceed to unlock the car. There is a keyhole on the driver’s door handle. Don’t forget to reinsert the key back into the fob. It’s not fully in until you hear a click.

Release the Hood

You can access the hood release lever now that your car is unlocked. This is located on the driver’s side to the left of the dead pedal. (or foot plate). It has a small illustration on it of the car with the hood open.

Pull it towards you. It may be a little stiff, depending on how much it has been used. The hood will lift open slightly. The is a further hood latch in the center of the hood. Lift the hood slightly and slide the internal latch to the left.

The hood will now release. Ensure that the hood is propped open correctly using the hood bar on the engine’s left. It fits into a small hole towards the top left of the hood.

Connect the Battery Pack / Booster

Now we are ready to check our 12V. First, remove the caps from the battery. It’s located at the front and to the right. Don’t touch anything that has bright orange cables. This signifies high voltage.

Under the caps are a red terminal and a black terminal.

A battery charger/booster pack is the best way to revive your Kona EV. Follow the procedure below:

  • Connect the Red to Red
  • Connect the Black (-) to Black (-)
  • Your battery charger will give you a reading of the voltage in your battery if it’s a digital booster.
  • Turn on the battery pack
  • When charged to 12V, disconnect the cables in the reverse order.
  • Black and Black (-)
  • Red and Red

The voltage should always be 12.65 V. Jumping your car this way is actually charging your 12V battery.

You can alternatively jump your Kona from a gas-powered car, but it’s not recommended. It is done similarly, but the donor car must be left running to send a charge through the booster cables to your flat battery.

Charging in this way could take an hour or more depending on several factors, such as the size of the donor vehicle engine, how low your flat battery is, the temperature outside, etc.

Your 12V battery is not used to drive your vehicle but to power up ancillary components.

Things to Check after Jumping / Charging

Your car is hopefully now running fine. (If it’s not, go to the last section of this article). However, when your 12V battery goes dead or discharges, it can affect other components in the car.


After a dead battery jumps or recharges, your Windows may need to be recalibrated. You will know this because they won’t go completely up or down. If they do, then all is good, and you can jump to the next item.

Recalibration is easily done using the following steps:

  • Turn on the vehicle
  • In the driver’s seat press the window button to open
  • When completely open continue to hold down for 2 seconds
  • Pull the window button up and close it fully
  • Hold for 2 seconds
  • Repeat steps 2 3
  • Window now recalibrated

Each additional window may need to be recalibrated also. Move to each seat to complete this.

Sunroof Reset

If you have a sunroof in your Kona, it must be reset after a battery discharge. Again this is an easy fix.

  • Turn on Power (Hyundai recommends you reset the sunroof in Ready Mode)
  • Push the Sunroof lever forward to close completely
  • Release the lever
  • Push and hold for 10 seconds
  • The glass should tilt and move up and down momentarily
  • Hold until it stops moving
  • Within 3 seconds, check the sunroof is working correctly


Your clock may or may not be affected by the battery discharge. If it is:

Radio / Audio

The same can be said for your radio after a battery discharge. Your presets or favorite stations might have disappeared.

Climate Control

Your Kona’s Auto Climate Control might need to be reset:

  • Turn on Power
  • Press the Auto Climate Control Button
  • Select your preferred temperature
  • The car will then acquire that level and remember it for future journeys

Why Was Your 12V Battery Flat?

Now that we are up and running again, we must find the root cause of the flat 12V.

It’s generally caused by open doors/tailgates and interior lights left on. If you have the Bluelink App, this will actually tell you that a door or tailgate is open. But you might not always use or check the Bluelink App after you return home.

So how does a door being open drain a 12V? As you know, when a door is open, the interior lights usually come on; during the daytime, you might not notice that they are on.

When you return to your car the next morning, you realize that your 12V is now flat.

I often find it’s not the driver’s door that has been left open but a passenger or rear door. If small children can leave the car themselves, the door might not close completely. The doors of modern cars car are heavy, and they don’t fully close with a child’s push.

Also, older children, i.e., teens with ear pods, are so preoccupied they don’t shut the doors properly, and the battery gets drained.

Or it could simply be an object blocking the tailgate latch from fully closing. It happens.

The other possible reason your battery is drained is that you were listening to music, but the car wasn’t running; audio will kill a 12V.

However, your battery may have discharged because it’s not functioning correctly. I wrote a post about Kona no-start, which you may find helpful – Kona won’t start

12V batteries last about 3-4 years. After that time, they start to degrade. If you find that you have had to boost or charge your 12V a few times recently, you will likely need a replacement 12V.

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All new Kona EVs have an Auxiliary Battery Saver. This is where the onboard computer is monitoring your 12V. If it seems a little low, it gets a boost from the high-voltage battery.

You know that this is happening as the Hyundai Badge at the front of the car illuminates with a yellow dot.

If it has happened when you have been away from the car, there will be a notification to say, ‘Aux Battery Saver was used while parked. So why, then, would my battery be flat? Well, there might not be enough charge in your High Voltage for this to happen, and so your 12V will die.

If you find that you are returning to your car and seeing this message frequently, it is worth getting your 12V checked with your Hyundai dealer.

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What if the Jumping Didn’t Work?

The last thing we’ll look at is if your Kona EV doesn’t respond to a jump or boost. The 12V battery may have completely failed and will not respond to a boost. If this happens, you must get a tow truck to transfer you to a Hyundai Dealer for further investigation.

You must not try to push start your car. You may irreparably damage the drivetrain.

When you call the Tow truck company, you must inform them that your car is electric. An EV must be towed by a flatbed tow truck or a truck using dollies. It can’t be towed with two front wheels on the ground.

Before transferring your car to the tow truck, you must do the following.

  • Put the power button on ACC
  • Depress the Brake Pedal
  • Select Neutral (N)
  • Your car can now be moved to the flatbed

I’ve covered a few of the other common Hyundai issues which you hopefully won’t experience, but if you do, we have you covered with these posts:

If you are curious about other EV models, check out the EV FAQ category.

Do I Need to Reprogram My Car After Battery Replacement?

Almost all cars manufactured since the 1970s feature onboard electronics, ranging from the engine control unit (ECU) to engine and vehicle diagnostics systems, such as those made on the On-Board Diagnostics (OBD) standard.

These electronics feature processing power equivalent to a home computer’s and run on the electricity generated by your car battery. Knowing this, you may be wondering if you need to reprogram or reset the car’s computers after replacing the battery.

Learn how the battery interacts with your car’s computers and whether you need to reset or reprogram them after replacing the battery.

What Does My Car Computer Do?

The most commonly understood definition of a car computer refers to the Engine Control Unit (ECU) or Engine Control Module (ECM). Although some cars may feature additional computers, most vehicles have at least one ECU or ECM.

The primary role of your ECU is to read sensors like the engine speed and steering angle sensor, interpret data, and control specific elements of your engine to provide optimal engine performance.

Most ECUs control the air-fuel ratio and the engine’s idle speed (number of RPMs when the car is idling). ECUs also remember various settings and data points, such as your preset radio stations, ideal air-fuel ratios, or ideal shift points (if your car is automatic). It may also control your car’s anti-theft system.

What Happens When I Disconnect My Battery?

Disconnecting your car battery for regular servicing, such as swapping the battery for a new one or placing a car in long-term storage, should not cause permanent damage to your ECU, as long as you follow the correct procedure.

Depending on the ECU’s design, it may or may not remember some of your settings, such as your preset radio stations, for up to 72 hours. If your ECU controls the anti-theft system, disconnecting the battery may lock you out of your car.

Like desktop computers and most other electronics, disconnecting the battery cable for a short period will not fully reset your ECU due to the residual power remaining in the circuits. If you want to perform a full reset, wait at least 15 minutes before reconnecting the battery to ensure all residual power has been drained.

A full reset reverts your ECU to its factory settings and likely causes it to forget its learned ideal shift points and air-fuel mixing ratios. When driving shortly after a reset, you may experience rougher acceleration and shifting than usual.

Under normal circumstances, you don’t need to do anything else other than keep driving the car after resetting the computer. The ECU will eventually relearn its ideal settings and reprogram itself with use.

How to disconnect the battery yourself safely

Follow these steps to safely disconnect and replace your car battery:

  • Before starting, always use appropriate safety equipment like insulated gloves and safety goggles, and tools (socket wrenches).
  • Turn the ignition off, then follow the manufacturer’s recommended procedure to locate your car’s battery and fuse box.
  • When disconnecting the battery cable, always remove the negative terminal (black) first and the positive terminal (red) last.
  • Do not let the positive cable touch any metal surface in the engine bay.
  • If you’re disconnecting the battery for a replacement, you may now pull the old battery out and insert a new one.
  • When you’re finished, reconnect the cables in the reverse order you followed to disconnect them: positive (red) first, negative (black) last.

Does Resetting the ECU Fix the Check Engine Light?

Disconnecting your battery and draining the power to cause an ECU reset is one of the most common fixes for a check engine light that won’t go away on its own. Doing so is equivalent to a hard reboot on a desktop computer, which is a standard way to eliminate many common problems.

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Once you have drained all residual power from your ECU, reconnect the battery and start the car again. Drive 10-15 miles to allow the ECU to adapt and read data.

If your check engine light comes on again, your car might be suffering from a severe issue. Consider having your car diagnosed for trouble codes to determine whether you need to take it to a professional mechanic.

How to check for trouble codes yourself

If your car is relatively new and you own an OBD-II scanner, you can connect it to your car and check for engine trouble codes yourself, which can help you determine if your car has issues after replacing a battery.

Here are the steps to follow:

  • Locate your car’s OBD-II port, also called a Diagnostic Link Connector (DLC) port.
  • Turn off the vehicle, plug the scanner into the connector and check your scanner’s instructions; some models require you to turn the engine on, while others simply need the ignition.
  • Wait for the “Ready” notification, then enter the car’s VIN into your scanner.
  • Use your scanner’s “Scan” or “Read” function and look for active trouble codes.
  • Check your vehicle’s diagnostic code list to interpret the trouble codes.
  • Once finished, turn the car off and carefully unplug the scanner from the DLC port.

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How Long Should You Disconnect Battery to Reset ECU?

Everyone who drives has experienced the dreaded check engine light. You take your car to the mechanic who says nothing is wrong with your car. Great, you think. Now what?

You could pay for a full vehicle diagnostic, but you could also try resetting your car’s ECU.

To figure out if you need an ECU reset, we’ll define what an ECU is, what resetting an ECU can and cannot achieve, and teach you how to reset your ECU.

Understanding an ECU Reset

To understand what an ECU reset is, we must understand what an ECU is. An ECU, or engine control unit, is a piece of electronic equipment present in most cars and trucks that controls the engine’s actuators. An ECU reset recalibrates your engine control unit by wiping its memory of your engine’s performance.

Why Do You Need an ECU Reset?

For example, resetting an ECU can be used to reset an engine’s optimum idling RPMs. Your car’s computer may need to be replaced if your engine idle improves after an ECU reset. In contrast, an ECU reset that results in a rough engine idle may indicate a mechanical problem.

You can also use an ECU reset to reset faulty check engine lights or other dashboard warnings. Faulty dashboard lights can cause your vehicle to fail its yearly safety inspection. By resetting your vehicle’s ECU, you effectively erase the computer’s memory of any issues your car engine was experiencing. Be aware that resetting your ECU is not a permanent solution to faulty check engine lights, but it may help you pass a vehicle inspection.

How Long Do You Leave a Battery Disconnected to Reset ECU?

You should leave your car’s battery disconnected for a minimum of fifteen minutes and no longer than thirty minutes to reset an ECU. To disconnect a car battery, remove the negative power cable from the negative terminal of your car battery with the use of a socket or monkey wrench.

Does Unplugging a Car’s Battery Reset the ECU?

Unplugging a car’s battery will reset the ECU in older vehicles—makes from about 1980 to 2005. Newer vehicles use computers with more advanced memory systems that store engine information even when the computer is disconnected from power.

Do You Have To Disconnect Both Battery Terminals to Reset ECU?

You do not have to disconnect both of your car battery terminals to reset an ECU.

You may choose to disconnect both battery terminals to reset an ECU, but it is not required. All you need to do to reset your ECU is interrupt the power flow from the car battery to the car’s ECU. The most efficient way to disrupt the ECU’s power supply is to disconnect the negative cable from the negative terminal.

What Happens if You Disconnect the Positive Terminal First?

You must disconnect the negative terminal of your car battery first if you plan to reset your car’s ECU by disconnecting the battery.

Disconnecting the positive terminal of a car battery while the negative terminal is still connected can lead to battery arcing. Battery arcing is a dangerous condition where an electric current jumps a gap in a circuit. An arc can cause a powerful charge to be transferred from the car battery to other metal parts of your car, leading to hazardous sparks.

How to Disconnect a Battery to Reset ECU?

Resetting an ECU by disconnecting a car battery is a simple process that anyone can do. Please be aware that resetting an ECU usually takes anywhere from 30 minutes to an hour, so plan accordingly.

ECU Reset Tools Needed

You will need a socket or monkey wrench, a set of jumper cables, a rag or piece of cloth, and your car keys to reset your car’s ECU by disconnecting the car’s battery. Optional: gloves to prevent your hands from getting dirty.

Step 1

Locate your car’s battery. Disconnect the battery’s negative cable from the negative terminal using your preferred wrench. Isolate the negative terminal by placing a rag or piece of cloth between the battery terminal and the negative cable.

Note: the negative terminal is denoted with a minus (-) symbol and is usually color-coded in black.

Step 2

Take your jumper cable and connect one of its clamps to the isolated negative cable. Take your jumper cable’s other clamp and connect it to the positive terminal. Once the circuit is complete, wait for at least 15 minutes.

Step 3

After 15 minutes (or more) have elapsed, disconnect your jumper cables from the car battery. Reconnect your car’s negative power cable to the negative terminal of the car battery.

Step 4

Insert your car’s key into the ignition. Turn the ignition key until the car’s dashboard lights come on, but do not turn the engine over.

Note: When done correctly, the fuel gauge needles and dashboard lights of your car will activate, but the engine will not turn over.

Now turn the ignition key back to its starting position to turn the car off. Now turn the car back on, this time turning the engine over.

Let the car idle for fifteen minutes. Your car’s ECU is now reset and will recalibrate after driving a few hundred miles.

How Long Does It Take for a Car Computer to Reset?

The process to reset a car’s computer takes about an hour. Once a car’s computer has been reset, it will take a few hundred miles of driving for an ECU to rerecord the vitals of a car engine.

Can You Reset a Car ECU Without Disconnecting the Battery?

You can reset your car’s ECU without disconnecting your car battery.

The purpose of disconnecting a car battery is to remove an ECU’s power supply. ECUs, especially on older vehicles, are designed to reset after they have lost their power source. Removing the ECU fuse from your vehicle’s fusebox will achieve the same result as disconnecting your car battery: it will interrupt the ECU’s power supply.

How to Reset A Car ECU Without Disconnecting the Battery

First, make sure your car is off. Then locate your car’s fuse box. Fusebox locations vary between car makes and models, but most are located on the driver’s side of the car. Refer to your vehicle’s owner manual to expedite the location of your car’s fusebox.

Once you have located your car’s fusebox, remove its protective panel. Locate the fuse labeled ECU (In some vehicles, the fuse may be labeled ECM). After 15 minutes have elapsed, replace the ECU fuse and restart your car.

Author: Dave Johnston

Dave Junior is a hands-on automotive technician with experience in performing service, diagnostics, and repairs on domestic and imported vehicles. He enjoys writing and sharing his knowledge far and wide.

Hyundai Battery Discharging Warning

Hyundai vehicles may display a warning message alerting the driver that the battery is getting discharged. This error often comes when you start the engine on cold mornings or turn off the engine but keep the ignition on. For example, you continue to listen to the radio for at least ten minutes or more after shutting down the engine.

If the battery warning light on your Hyundai illuminates while driving, it is important to take immediate action. The warning light indicates that the alternator may not function properly, resulting in the vehicle relying solely on battery power. To prevent the further discharge of the battery, it is recommended to turn off any non-essential electrical accessories, such as the audio system, navigation, or air conditioning. It is important to have the alternator checked by a professional mechanic as soon as possible to prevent potential damage to the battery and other electrical components.

The “Battery Discharge Warning” displays on the Audio/Nav screen when the vehicle’s battery cannot maintain a specified voltage level under the existing conditions. If the engine is running, the battery discharges faster than charged. The problem can be a worn drive slip, defective alternator, bad ground connection, or excessive current demand by electronic devices.

Error messages

It is normal for this warning to come on if the engine is off but the ignition is left on for over ten minutes. Electrical consumers such as chargers plugged into the power outlet, seat heater, climate control, USB port, radio, and vehicle lights can discharge the battery at a high rate, leading to this message.

If you have most of these electronic consumers on when the engine is off, battery discharging warnings will come up much quicker.

The battery is getting discharged is a friendly reminder telling you to start the engine. The battery may die if you don’t start the engine or turn off the ignition. It can happen even in a new car.

To clear the battery getting discharged warning, start the engine to allow the alternator to recharge the battery. If you keep the ignition on, the battery will discharge to the point that you will not start the car and may need a jump start.

Battery Discharge Warning While Driving

If the battery discharge warning comes on when the engine is running, you have a problem that needs to be addressed. Common problems that can lead to Hyundai battery discharging include:


If the battery gets discharged too fast, a warning occurs when the engine is idle or driving. In many cases, the alternator may be the problem.

If the alternator is not generating enough electricity to power the engine and electronic consumers, it may need to be replaced.

The problem that causes this issue in most cases is a faulty voltage regulator. The voltage regulator is mounted on the back of the alternator. Even though you can replace just the voltage regulator, most auto repair shops recommend replacing the complete alternator as a unit.

Weak Battery

A weak battery is another common problem that can cause the Hyundai battery warning light to come on.

If the battery is not holding a charge or can no longer charge fast enough, you could end up with the battery is getting discharged on the dashboard or touch screen.

You can easily check if the battery is good with a car battery tester. A battery tester runs load tests on the battery to make sure the battery can hold a charge. Follow this guide to learn how to test your car battery yourself.

GPS System

The GPS module may get stuck in a Satellite searching mode, leading to the battery discharging at a high rate. One possible solution is to reset the GPS module by removing the GPS fuse for a few minutes.

On a Hyundai Elantra, you can reset the GPS by pressing the reset button for the GPS. Look for a reset button under the volume knob and hold it down for thirty seconds. The GPS will reboot and should operate normally.

Serpentine Belt

A worn serpentine belt or weak belt tensioner can be why a Hyundai shows the battery is discharged when driving.

Ground Connection

Another possible issue could be a poor ground connection. Check both battery terminals and ensure a good ground connection between the engine and frame.


Hyundai Battery Discharging Warning indicates that your Hyundai vehicle’s battery is not being charged properly and it’s discharging. This can happen when the alternator, the component that charges the battery while the engine is running, is not working correctly. As a result, the vehicle’s electrical systems will rely solely on the battery power, which will cause the battery to discharge quickly. In technical terms, this warning is caused by a malfunction or failure of the alternator, which is responsible for maintaining the battery charge. If this warning appears, it’s important to have your vehicle checked by a professional mechanic as soon as possible to prevent potential damage to the battery and other electrical components.

Frequently Asked Questions

What does it mean when it says battery discharging?

This means that your battery is losing voltage. You need to understand that your battery is discharging at a time when it is not directly charged. Battery discharging/draining can be an inactive or active process.

What would cause a car battery to discharge?

If the alternator is bad, it will cause the battery not to charge and let itself drain even when the car is running.If you leave the lights or the radio running without the engine running, it will cause the battery to drain and lose its voltage.

How much is a battery for a Hyundai?

You can get a replacement/new battery for around 45-250. Price may vary depending on the size, quality, and power.


We hope you find the Battery Discharging Warning Hyundai guide helpful. Check these troubleshooting and repair guides for more help on your Hyundai.


Rushit Hila, an ASE-certified engineer (G1 Automotive Maintenance and Repair), brings over two decades of hands-on experience in the automotive world to his writing. With a strong educational background, including a Master of Science in Engineering and a Bachelor of Science in Engineering, he has honed his skills and expertise through years of practical work. As a respected authority in the field, Mr. Hila is dedicated to offering insightful and valuable content that resonates with both vehicle owners and mechanics. View all posts

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