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Home / Symptoms / Battery Light

Four common causes for a “battery” warning light on the vehicle and their related parts.

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Does Your Car's Dashboard Show The Battery Light On?

A car battery light is probably warning you the battery is weak, meaning its voltage is lower than it should be. Alternatively, it can be related to issues on the alternator, drive belt, or internal wiring. Commonly, it can also mean that the battery terminals are corroded.

Watch out: Addressing potential issues with your car's electrical system, be it battery faulty wiring or broken electrical components is crucial. Take the time to review your car's symptoms and consult with a technician for a proper diagnosis.

The most common causes for a battery warning light

The most common causes for a battery warning light are:

Faulty alternator: The alternator is the battery’s sidekick, helping your vehicle generate power to feed many electrical accessories without solely depending on the battery. However, since the alternator belongs to the charging system, it’ll trigger a battery warning light if it fails.
Faulty drive belt: The drive belt is a power-transmitting belt that rotates and generates electricity. Many of your vehicle’s electrical-related components rely on a drive belt, like the AC compressor, the alternator, etc. However, if any of these drive belts fail, your battery warning light pops up on the dashboard, since it means an issue in the electrical system.
Faulty serpentine belt: The serpentine belt works directly with your vehicle’s alternator and helps in feeding power to many electrical accessories and components. However, the serpentine belt can fail, slip out of place, or rip, leading to lower power production and triggering a battery warning light.
Faulty battery: The battery is your vehicle’s main source of power. A dead battery makes your vehicle stall and get stuck in place. The battery has many sensors, so if it develops an issue, a battery warning light pops up on the dashboard.
Faulty circuit wires: Every electrical-related component in your car needs proper wiring to send and receive signals and power. Therefore, if any wiring system fails, electrical components like the voltage regulator might stop receiving proper electrical power, resulting in different vehicle issues. In such cases, a dashboard battery light pops up on the dashboard.

Frequently Asked Questions

Is your car's dashboard displaying the battery warning light?

Your battery powers your car's ignition, computer, lights, radio, and climate control. The alternator helps recharge the battery, and it can't keep up with the electricity needs of the car whenever any of its components wear out. This causes the battery warning light to pop on the dashboard.

If you notice dimming lights, disabled cruise control, radio issues, air condition inefficiency, or issues starting the vehicle, save this information; they're essential if you go to an auto shop later.
Are your car's accessories not working anymore?

The drive belt powers all of your car's accessories, like the water pump, power steering pump, A/C compressor, and alternator. If the drive belt breaks, these accessories won't operate as usual, and you might lose their functions.

If you notice dimming lights, a squealing or grinding noise, radio issues, air condition inefficiency, no lights on the dashboard, or issues starting the vehicle, save this information; they're essential if you go to an auto shop later.
Do the warning light flashes intermittently?

The battery terminals connect the car's battery to all its electrical parts. If the terminals get corroded from acid, which is a common material in batteries, the connections can become loose, causing the battery warning light to flash on and off.

If you notice a check engine light on the dashboard, the radio clock resetting to 12:00, the vehicle shutting off unexpectedly, air condition inefficiency, or no lights on the dashboard, save this information; they're essential if you go to an auto shop later.
Are you experiencing accessory issues while the battery warning light is active?

The alternator drive belt connects the engine and the alternator to charge the battery. If the belt is loose, it can slip, making the alternator work harder. This can cause problems with other accessories like power steering, A/C, and the water pump and may lead to symptoms like hard steering, poor A/C performance, and overheating.

If you notice a check engine light on the dashboard, squealing noises, lights dimming, the vehicle harder to steer, or no lights on the dashboard, save this information; they're essential if you go to an auto shop later.
Does your vehicle crank slowly when you start it?

A car battery has 6 cells that work together to power your vehicle. As the battery ages, these cells start to degrade, resulting in decreased performance. During a battery test, the technician measures the battery's ability to produce a certain amount of amperage and voltage, comparing them to the battery's specifications. If the battery isn't producing enough power, it may cause the engine to crank more slowly when starting the car, and that's when the warning light may come on.

If you notice a check engine light on the dashboard, a battery warning, and dimming dash lights when starting the vehicle, save this information; they're essential if you go to an auto shop later.
Are there any other warning lights on the dashboard?

Your car's computer monitors all the electrical parts. If something is wrong, like a faulty wire in your car's electric charging system, the computer will turn on the check engine light and may display a message saying there's a problem with the charging system.

If you notice radio issues, disabled cruise control, dimming lights, weaker power windows' controls, A/C or heater malfunction, radio clock resetting to 12:00, or car shutting off unexpectedly, save this information; they're essential if you go to an auto shop later.

Typical fixes to address the cause(s)

These are typical processes and repair services that fix a check engine light issue

The most common cause: Faulty battery

The most common reason for a car dashboard to show a battery warning light is due to an issue with the battery itself. The battery depends on wiring, terminals, a good charge, and connections to properly send power to the rest of the vehicle. In most cases, batteries stop working due to aging and the natural life cycle. However, batteries can fail before expected if they start leaking, get corroded, develop internal issues, etc.

Symptoms it causes: Apart from the battery warning light on the dashboard you might also notice electrical issues, struggle to start the vehicle, dimming headlights, starting issues, etc.
High risk of priority: The battery is essential to keep the vehicle running and working fine. A faulty battery can lead to the loss of electrical safety systems like the power steering, ABS, and TCS. Plus, a failing battery might fail to power the vehicle, risking it to become stranded randomly.

How exactly does the battery develop issues?

The battery can develop issues for many reasons. For example, batteries can overstress by compensating if the alternator or serpentine belt is faulty — note that both the alternator and serpentine belt make the battery’s life easier by constantly giving it a little charge while the vehicle is running. Batteries can also develop leaks, especially if the battery is bad quality or if the battery hold-down is faulty and not tightening the case properly. Lastly, batteries can simply last their life cycle and stop working naturally, which typically takes between 3 to 5 years.

Go safe: Ask for a mechanic to inspect your vehicle’s battery and charging system to investigate the wiring, alternator, drive belts, serpentine belt, etc., and see if there’s further damage. Many shops do transparent vehicle inspections and lay out your options after investigating your vehicle’s conditions.

What’s a vehicle inspection? It’s “detective work” on your vehicle, checking its systems to see if anything prevents the car from working as expected. In this case, mechanics examine different parts of your vehicle to track what’s causing the battery to fail. They’ll also check the condition of components during their inspection, noting which are causing the problem and which got affected by it, recommending to replace them in order of priority.

Transparency example in a faulty battery service

A battery and charging system inspection is the most transparent process to understand why your vehicle’s battery is faulty. This is because many components in the charging system affect your battery, and if they fail, they might cause it to fail.

Let’s read an example of how this kind of inspection helps to service a leaking battery.

In a scheduled service, a customer stated their car’s dashboard was displaying a battery warning light on the dashboard constantly. The customer also mentioned that their vehicle was struggling a bit to start, and the headlights seemed to be dimming.

The technician went straight to the vehicle’s battery. After looking around the battery, the expert found that the base that was supposed to support the battery, known as the hold-down, was bent. The technician could manually slide the battery around, indicating that it wasn’t properly tight.

The battery was also showing leak signs, probably due to being banged around while the vehicle was driving. The case was damaged, and after measuring the battery voltage, the technician ruled that the battery was faulty.

Defective battery hold-down

In this case, the mechanic put the “Immediate Action” tag on the battery and the battery hold-down.

Similar Symptoms

Below are just a few examples of typical Symptoms and Fixes your car might be experiencing

Four common causes for a “check engine” light on the vehicle and their related parts.

Does Your Car's Dashboard Show The Battery Light On?

The most common causes for a battery warning light

Frequently Asked Questions

Is your car's dashboard displaying the battery warning light?

Are your car's accessories not working anymore?

Do the warning light flashes intermittently?

Are you experiencing accessory issues while the battery warning light is active?

Does your vehicle crank slowly when you start it?

Are there any other warning lights on the dashboard?

Typical fixes to address the cause(s)

The most common cause: Faulty battery

How exactly does the battery develop issues?

Transparency example in a faulty battery service

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Why Is My Car's Power Steering Warning Light On?