What Does BMW E90 Battery Warning Light Mean

by Phil Borges // in Car

Many drivers of BMWs are familiar with the battery warning light. It’s not a particularly common light, but when it comes on, it can be concerning. What does this light mean, and what should you do when you see it? In this article, we’ll explore the meaning of the BMW E90 warning lights and offer some tips for dealing with it.

What does it mean when the battery light comes on in a BMW?

The battery light coming on in a BMW may mean different things, depending on the model of BMW. It serves as a warning to the driver that there is a problem with the battery or charging system. In some cases, it may just be a warning light and not an indication of a serious problem. However, if the light does not go off after the engine has been started, it could mean that there is something wrong with the battery, and it should be checked out by a mechanic.

To help you determine what causes the battery light to come on in your BMW, here is a list of some common reasons:

Defective battery: A defective battery is one of the most common reasons for the battery light to come on in a BMW. If the battery is not charging properly or if it’s not holding a charge, this will cause the light to turn on.

Bad alternator: The alternator is responsible for supplying power to the electrical system and keeping the battery charged. If the alternator is not working properly, it will not be able to keep the battery charged, and the light will come on.

Faulty wiring: If there is a problem with the electrical wiring, it can cause the battery light to come on. This may be caused by a short circuit or an open circuit.

Broken fuse: A broken fuse can also cause the battery light to come on. If there is a problem with one of the fuses in the system, it can disrupt the flow of electricity and cause the light to turn on.

Defective charging system: A defective charging system can also cause the battery light to come on. This may be caused by a faulty alternator, a bad wiring connection, or a problem with the voltage regulator.

If the light comes on while you’re driving, it’s important to pull over and turn off the car as soon as possible. Continuing to drive with the light on can damage the car’s battery and electrical system. Ignoring the warning light could result in damage to the battery or other components in the charging system. It is best to have the problem checked out by a mechanic to determine what needs to be done to fix it.

How do I reset my BMW battery light?

There are a few ways you could try to reset your BMW battery light. One way is to disconnect the negative terminal of the battery for about fifteen minutes and then reconnect it. Another way is to turn your ignition on and off three times, with the engine not running, within five seconds. If neither of those methods works, you could try jumping your car using jumper cables. If none of these methods work, then you may have a problem with your battery, and it would be best to take it to a mechanic.

A weak battery is not a good thing for your car, as it can lead to a number of other problems. A weak battery could cause your engine to start slowly or not at all. It could also prevent your car from starting in cold weather. If you have a weak battery, you should replace it as soon as possible.

How do I know if my BMW battery is dying?

The warning battery light on BMW is one of the most important indicators on your dashboard. When this light comes on, it means that there is a problem with your battery, and you need to take action. If ignored, this could lead to a dead battery and a lot of inconveniences. In order to avoid this, you should know what the light means and what you can do to fix it.

There are other telltale signs that your BMW battery might be dying, and these are:

  • If your car is sluggish to start or the engine cranks slowly, that’s usually a sign that the battery is getting low.
  • A car that won’t start, even when you jump start it, is a clear indication that the battery needs to be replaced.
  • When the dashboard lights dim or flickers when you start the engine. And if your BMW’s “check engine” light comes on, it’s likely because of a problem with the car’s battery or charging system.
  • The battery dies more quickly than it used to.
  • You hear a strange noise coming from your car’s engine when you’re trying to start it up.
  • When you test your battery, it’s below 12 volts. A healthy battery should read between 12.62 and 13.48 volts.
  • The battery itself is severely corroded. Corrosion prevents the battery from working properly and can even cause it to short out.
  • The battery is damaged or swollen that could lead to an explosion if not fixed or attended to.

If you’re experiencing any of these symptoms, it’s time for a new battery. You can either go to your local BMW dealership or an aftermarket car parts store. Whichever route you choose, make sure to get a quality battery and have it installed by a professional.


BMWs are known for their high-quality and reliable cars, but even the best can have issues from time to time. Car batteries in BMWs are not exempted from this. If you see the battery warning light turn on in your BMW, it is best that the issue is attended to as soon as possible.

Proper maintenance and care of your BMW battery can help prolong its life and avoid any potential problems. One of the best ways to take care of it is by scheduling a regular battery checkup. This will help ensure that your car’s battery is in good condition and can handle the demands of everyday use. The car battery service check can avoid potential problems and keep your BMW running smoothly.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.