20 Dashboard Warning Lights You Need to Understand

Dashboard warning lights can be confusing, but they’re essential for keeping your car in good shape. Understanding what these lights mean can help you avoid costly repairs and stay safe on the road. In this article, we’ll break down 20 common dashboard warning lights you need to know about and explain what you should do when they light up.

Check Engine Light (Malfunction Indicator Lamp)

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The Check Engine Light is one of the most crucial dashboard indicators. It signals that your car’s engine management system has detected an issue, which could range from a loose gas cap to more serious engine problems. Ignoring this light can lead to more significant damage and costly repairs.

Battery Warning Light

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The Battery Warning Light alerts you to problems with the car’s electrical system, particularly the charging system. This light often indicates a failing alternator, a weak battery, or loose wiring. If ignored, you could find yourself stranded with a dead battery.

Oil Pressure Warning Light

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This light warns of low oil pressure in your engine, which could lead to severe engine damage if not addressed. Low oil pressure could be caused by a low oil level, a failing oil pump, or oil leaks. It’s crucial to stop driving immediately and check the oil level to prevent engine failure.

Brake System Warning Light

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The Brake System Warning Light indicates issues with your braking system, such as low brake fluid or problems with the anti-lock braking system (ABS). Given the importance of brakes for safety, it’s essential to address this warning promptly to avoid brake failure.

Tire Pressure Monitoring System (TPMS) Light


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The TPMS Light alerts you when one or more of your tires are underinflated. Proper tire pressure is vital for safe handling, fuel efficiency, and tire longevity. Ignoring this light can lead to poor vehicle performance or even a tire blowout.

Temperature Warning Light


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This light indicates that your engine is overheating, which can cause severe damage if not addressed. Overheating can result from a coolant leak, a failed thermostat, or a broken water pump. Pull over immediately to avoid engine failure.

ABS Warning Light

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The ABS Warning Light illuminates when there’s a problem with the anti-lock braking system. ABS is crucial for preventing wheel lockup during hard braking, helping you maintain control of the vehicle. Addressing ABS issues is essential for safe driving, especially in slippery conditions.

Airbag Warning Light

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The Airbag Warning Light signals a malfunction in the airbag system. If this light is on, your airbags may not deploy in the event of a collision, posing a significant safety risk. It’s important to have this system checked and repaired by a professional.

Power Steering Warning Light

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This light warns of issues with the power steering system, which can affect your ability to steer the vehicle safely. A failing power steering pump, low fluid levels, or electrical issues can trigger this light. Ignoring it could lead to a sudden loss of steering control.

Transmission Temperature Warning Light

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The Transmission Temperature Warning Light indicates that your transmission is overheating. High transmission temperatures can lead to transmission failure or expensive repairs. Causes can include low transmission fluid, a faulty cooling system, or heavy towing.

Fuel Level Warning Light

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The Fuel Level Warning Light reminds you when your fuel is running low. While it may seem trivial, running out of fuel can cause more than just inconvenience; it can also damage your fuel pump. It’s a simple reminder to fill up before it’s too late.

Door Ajar Warning Light

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The Door Ajar Warning Light alerts you that one or more of your vehicle’s doors are not fully closed. Driving with an open door can be dangerous, as it increases the risk of doors swinging open while the vehicle is in motion. This light ensures that all passengers are secure.

Seatbelt Warning Light


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The Seatbelt Warning Light reminds you to buckle up, which is the simplest and most effective way to protect yourself in a crash. Some vehicles also include an audible alert that continues until all seatbelts are fastened. This light plays a key role in passenger safety.

Traction Control Warning Light

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This light indicates that the vehicle’s traction control system is either active or experiencing an issue. Traction control helps prevent wheel spin during acceleration, especially in slippery conditions. If the light stays on, it may mean that the system is disabled, which could compromise safety.

Cruise Control Indicator Light

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The Cruise Control Indicator Light shows that the cruise control system is active. While not a warning light, it’s important to be aware when cruise control is engaged to maintain proper control over your vehicle’s speed, especially in changing traffic conditions.

Fog Light Indicator

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The Fog Light Indicator reminds you that your fog lights are on. Fog lights improve visibility in foggy or misty conditions, but they can blind other drivers if left on in clear weather. This light helps you avoid inadvertently dazzling other road users.

High Beam Indicator Light

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The High Beam Indicator Light shows that your high beams are on. High beams improve visibility on dark roads but can blind oncoming traffic if not switched off in time. This light ensures you’re aware of when to dim your headlights.

Washer Fluid Warning Light

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The Washer Fluid Warning Light alerts you when the windshield washer fluid is low. Clean windshields are crucial for visibility, especially during bad weather. Keeping your washer fluid topped off ensures you can clear your windshield of dirt, bugs, and other debris.

Glow Plug Indicator Light (Diesel Engines)

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The Glow Plug Indicator Light is specific to diesel vehicles and shows that the glow plugs are warming up to start the engine. If this light stays on after the engine has started, it could indicate a problem with the glow plugs or the engine’s starting system.

Adaptive Cruise Control Warning Light

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The Adaptive Cruise Control Warning Light indicates that the adaptive cruise control system is active or experiencing an issue. Adaptive cruise control automatically adjusts your speed to maintain a safe following distance from the car ahead. Understanding this light ensures you know when this feature is functioning or needs attention.

This article originally appeared in MyCarMakesNoise.

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Author: Dave Johnston

Dave 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.

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