Why Battery Light And Brake Light On At Same Time?

While driving home from work tonight I noticed that the battery light and brake light on at same time. Even after shutting down the engine and restarting the light remains on.

If you are unable to find the reason, then you have reached the right place where we will help you out in getting the solution for this problem.

There are multiple sensors in your automobile monitor and they ensure that all of the systems are functioning properly or not.

Why Do You See Battery Light And Brake Light Flashing?

When there is a problem with your braking system, your brake light will illuminate/flash whereas the battery light will illuminate when there is a problem with your battery charging system.

1. Alternator Failure

When both the battery and brake lights turn on at the same time, it’s a sign that your alternator is about to fail. While the battery may still be charged, it may not be at the needed voltage of at least 13 volts.

2. Problem With Battery

One of the possible reasons for the battery and brake light coming on simultaneously is a bad alternator. If your alternator isn’t working properly, it can’t generate enough electricity to power both the car’s electrical system and its braking system. As a result, the battery and brake light will come on at the same time.

3. Brake Switch Issue

Another possible reason for the battery and brake light coming on simultaneously is a malfunctioning brake switch. When the brake switch malfunctions, it can’t send a signal to the car’s electric system when you press on the brake pedal. This can cause the battery light and brake light on at same time.

4  Low Voltage

Low voltage is also a possible cause of the battery and brake light coming on simultaneously. This results in low voltage for both lights – the brake signal from the switch isn’t strong enough to send power up through all that wire, so they are lit at once.

If we talk about a particular company like Nissan

The Nissan is a popular car, and one of the most common problems with it is that the battery and brake light will come on. This can happen for many reasons.

What To Do If Battery Light And Brake Light On At Same Time?

The best way to solve this problem is to fix an appointment with a mechanic and have them test the electrical system to determine what’s causing this issue.

If you follow the steps below, you’ll be able to detect if your alternator is not functioning properly:

  1. Get a hold of a voltmeter.
  2. Make sure the connectors on your battery are clean.
  3. Connect the battery connections to the voltmeter.
  4. While the engine is turned off, the voltage should be between 12.5 and 12.8 volts.
  5. Start the engine and look for higher voltage readings, ideally between 13 and 13.5 volts.
  6. Switch on your radio, lamps, and other electrical devices.
  7. Your reading should be similar to what it was previously.
  8. A lower result indicates that the battery is being undercharged by the alternator.
  9. If the number is greater, your alternator is overcharging the battery. If the results are incorrect, I recommend taking your automobile to a professional.

Will My Car Start If The Alternator Fails?

“It depends,” is the quick response. An alternator can overcharge, undercharge, or simply stop working. You will be able to drive your car for short distances in any of these conditions until your car battery is gone.

If you suspect that your alternator might be the problem, you can replace it yourself or take your car to a mechanic. If you choose to replace it yourself, be sure to purchase an alternator that’s compatible with your

If the brake switch is working properly, but there’s an issue with your car’s electric system, another possible cause is worn-out wiring and/or corrosion on the battery terminals.

How Much Will It Cost To Repair It?

The cost of replacing an alternator, like other automobile parts, varies based on the car’s age, model, and manufacture. However, expect to pay at least $250 for the part and an additional $200 for labour.

How Long Can I Drive With The Brake Light On?

If the brake light stays on, it means there is a problem with the braking system. You will need to take your car in for service. If you continue to drive with the brake light on, it could damage the braking system and cause an accident, but if we say roughly, you can drive at around 1000 miles, but this will be risky.

The same is true for the battery light – if it stays on, you need to take your car in for service. Driving with a lit battery light could damage the battery and cause it to fail.

If you are driving and either of these lights come on, pull over as soon as possible. It is recommended not to continue driving with these lights on. It’s dangerous and could lead to an accident.

If your car is starting to show signs that its battery might be failing, like difficulty starting up or a noticeable decrease in power, then it’s best to avoid driving it until the issue has been fixed because it could be dangerous.

Is It Safe To Drive With The Battery Light On?

In general, it’s usually safe to drive with the battery light on – as long as you’re not experiencing any other problems with your car that would indicate that it’s not functioning properly.

When it comes to the brake light, it usually comes on when there’s something wrong with the braking system, like a problem with the brake pads or fluid. If your car is experiencing any problems with its brakes, it’s best to have them fixed as soon as possible to avoid further damage because it is risky otherwise.

If you’re ever in doubt about whether or not it’s safe to drive your car, it’s always best to consult with a trusted mechanic or automotive technician. They’ll be able to inspect your car and solve the issue, then provide you with advice on what steps you need to take to get your car back up and running safely.


I hope, this article helped understand what might be the reasons causing the battery light and brake light on at same time. Last but not least, drive safely, follow all the traffic rules and if there is a red light. stop the car till turns green which means go, and the most important thing is never to drink and drive this might result in accidents. Must follow the important and basic steps on the road while driving.

If you have any doubts about the methods described above, let us know in the comments below, and we will get back to you.


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