Dashboard warning lights are there for a reason. Modern cars can display a wide range of dashboard warning lights, and understanding what they mean can help you react appropriately. While it can be tempting to ignore a warning light and hope that it disappears, doing so could allow a relatively minor problem to develop into a much more expensive or potentially dangerous fault.
Different warning lights have different levels of urgency. In general, a red warning light means you should stop as soon as it is safe to do so, while an amber warning light usually means the vehicle needs checking as soon as possible. However, the exact meaning can vary between manufacturers, so your vehicle’s handbook should always be checked if you are unsure.
With that in mind, here are five important dashboard warning lights every driver should know.
The engine temperature warning light, sometimes referred to as the coolant temperature warning light, normally indicates that the engine is overheating.
Of all the dashboard warning lights, an overheating warning is one that should receive immediate attention.
Overheating can happen for several reasons, including low coolant, a coolant leak, a faulty thermostat, a failed cooling fan or another problem with the cooling system.
If the red engine temperature warning light appears while driving, you should stop somewhere safe and switch the engine off. Continuing to drive an overheating engine can cause serious and potentially irreversible damage.
Once the engine has cooled sufficiently, you can check the coolant level and look for obvious leaks. Never remove a coolant reservoir or radiator cap while the engine is hot, as the cooling system may be pressurised.
If the coolant level is low, topping it up may temporarily resolve the warning, but the underlying reason for the coolant loss should still be investigated.
The engine oil warning light is another warning that should never be ignored.
Engine oil lubricates the moving parts inside the engine and helps prevent excessive friction and heat. An oil warning light can indicate low oil pressure, low oil level or another problem with the engine’s lubrication system. In some vehicles, it can also relate to oil temperature.
Regularly checking your vehicle and understanding dashboard warning lights can help you spot potential problems before they become more serious.
If the oil warning light comes on while driving, pull over somewhere safe and switch off the engine as soon as possible.
Once stopped, check the engine oil level using the procedure specified in your owner’s manual. If the level is low, you may need to add the correct oil for your vehicle.
However, if the oil level is normal and the warning remains illuminated, there could be a problem with the oil pump, oil pressure or another component. In this situation, continuing to drive could cause severe engine damage, so professional assistance may be required.
The battery warning light can be slightly misleading because it does not necessarily mean that the battery itself has failed.
Knowing what dashboard warning lights mean can help you recognise that a battery warning may actually indicate an alternator or charging-system problem.
When the vehicle is started, it is normal for several warning lights to illuminate briefly before going out. However, if the battery warning light remains on after starting or appears while driving, it can indicate a fault with the vehicle’s charging system.
Possible causes include a failing alternator, a worn battery, damaged wiring or an electrical connection problem.
If the charging system is not working correctly, the vehicle may eventually run out of electrical power and stop.
For this reason, you should avoid ignoring the warning light. If it appears while driving, find a safe place to stop and arrange for the charging system to be checked.
The brake system warning light is one of the most important dashboard warning lights because it relates directly to one of the vehicle’s most important safety systems.
A red brake warning light can have more than one meaning. On many vehicles, it illuminates when the parking brake is engaged. However, if it remains illuminated after the parking brake has been fully released, it can indicate low brake fluid or another braking-system problem.
If the warning light appears while driving, take it seriously.
If you notice reduced braking performance, unusual brake pedal behaviour or another brake-related problem, stop as soon as it is safe to do so and seek professional assistance.
It is particularly important not to continue driving simply because the brakes still appear to work normally. A warning light can indicate a fault that may become more serious.
The engine management warning light, also known as the check engine light or engine warning light, can indicate a fault with the engine or one of the systems connected to it.
Unlike some red warning lights, an amber engine management light does not always mean that you need to stop immediately. The exact meaning depends on the vehicle and the way the warning light behaves.
Potential causes range from relatively minor electrical or sensor problems to faults involving emissions systems, the engine or other components.
If the light stays illuminated after starting the vehicle, you should have the car checked as soon as possible rather than simply ignoring it.
Some dashboard warning lights may disappear after a restart, but this does not necessarily mean the underlying fault has been fixed.
If the engine management light is flashing, or the vehicle is also experiencing symptoms such as severe loss of power, misfiring or unusual noises, the problem may require more urgent attention.
A diagnostic scan can help identify the cause of the warning and determine what repairs are required.
The colour of a warning light can give you an indication of how urgently you need to act, although the owner’s manual remains the best source for your particular vehicle.
Red warning lights generally indicate a serious problem or safety issue. You should stop driving as soon as it is safe to do so and seek assistance where necessary.
Amber or yellow warning lights generally indicate that a system requires attention. You should have the vehicle checked as soon as possible.
Green warning lights generally indicate that a system is operating or has been activated rather than warning you about a fault.
Modern vehicles can have dozens of different warning lights, so the five covered here are only some of the most important ones to understand.
Learning the meaning of dashboard warning lights can also help you decide whether you can continue your journey or need to stop.
The more familiar you are with dashboard warning lights, the easier it is to recognise when your car needs immediate attention.
Dashboard warning lights are designed to alert you when your vehicle needs attention. Ignoring them can allow faults to become worse and potentially leave you facing a much larger repair bill.
If a red warning light appears, don’t assume that the car is safe to continue driving simply because it still feels normal. Find a safe place to stop and check your owner’s manual for the correct advice.
For amber warning lights, arrange for the vehicle to be checked as soon as possible, particularly if the car is behaving differently.
If you’re unsure what a warning light means, your vehicle’s handbook is the best place to start. You can also use a reputable automotive guide such as the RAC’s dashboard warning light guide for additional information.
Taking dashboard warning lights seriously can help you identify faults before they develop into more expensive problems. Paying attention to what your car is telling you can help identify problems early, potentially prevent further damage and, most importantly, help keep you and other road users safe.
Knowing what dashboard warning lights mean is a simple but important part of responsible car ownership.
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