What Do Your Dashboard Warning Lights Mean?

While modern car dashboards increasingly resemble futuristic wrap-around infotainment displays, the warning lights they show are not meant for entertainment—they provide essential information about your vehicle’s condition.

However, with so many different warning indicators appearing in today’s vehicles, it’s easy to lose track of what each symbol represents. Below is a simple guide to help you understand them.

 

Dashboard Warning Light Colours Explained

The colour of a dashboard warning light usually reflects how serious the issue might be. It’s also worth remembering that when you start your car, most dashboard lights will briefly illuminate as part of a system check. You only need to be concerned if they remain on after the engine starts.

The three primary colours include:

  • Red: Indicates an issue that requires immediate attention. If a red light appears, stop the vehicle safely and address the problem.
  • Amber/Yellow: Signals something that should be inspected or fixed soon.
  • Green: Shows that a particular system is active and functioning normally, so no action is required.

Critical Red Dashboard Alerts

  • Battery Voltage Low
  • Boot Open
  • Airbag Deactivated
  • Car Key Battery Low
  • Seatbelt Not Fastened
  • Handbrake On
  • Lane Assist Disabled
  • Engine Overheating
  • Bonnet Open
  • Object Ahead
  • Check Engine Oil
  • Parking Brake Engaged
  • Power Steering Failure

Amber Dashboard Warning Indicators

  • Powertrain Malfunction
  • Traction Control
  • Battery Range Low
  • Rear Window Heating On
  • ABS Malfunction
  • Automatic Windscreen Wiper On
  • Automatic Start-Stop: Engine Off
  • Tyre Pressure Low
  • Hill Start Assistance
  • Fuel Level Low
  • Fuel System Malfunction
  • Outside Temperature Low
  • Blind Spot Monitor Disabled
  • Electronics Malfunction
  • Slippery Warning
  • Headlight Height Adjustment
  • Enter Clutch
  • Lamp or Rain Sensor Malfunction
  • Air Filter Dirty
  • Air Suspension Malfunction
  • Rear Fog Lights On
  • Lighting Problem
  • Engine Malfunction
  • Emergency Run Active
  • Diesel Particulate Filter Failure
  • Washer Fluid Level Low
  • Shock Absorber/Suspension Malfunction
  • Key Is Missing
  • Speed Limiter Active
  • Parking Heater Switched On
  • Preheating Active
  • Windscreen Defroster Active
  • Water In Fuel

Green Dashboard Indicators

  • Adaptive Cruise Control Enabled
  • Cruise Control Engaged
  • Dipped Beam Turned On
  • Depress or ‘Hold’ Brake
  • Indicators Turned On
  • Side Lights Turned On

Blue Dashboard Indicators

  • High Beam Turned On

Meaning of Individual Dashboard Warning Lights

Red Dashboard Alerts

Battery Voltage Low

Indicates: If the battery voltage appears low, it may point to a problem with the alternator, drive belt, or electrical connections supplying power.

Remedy: Pull over safely and consider requesting roadside assistance. When battery voltage drops too much, important systems could stop functioning such as headlights, power steering, or ABS.

Boot Door Open

Indicates: The boot door may not be fully closed. Even if it looks shut, a loose latch could allow it to open while driving over bumps.

Remedy: Stop somewhere safe and ensure the boot is securely closed. If the warning continues, schedule a check for the sensor.

Airbag Deactivated

Indicates: This appears when the airbag system has been turned off, either intentionally when installing a rear-facing child seat or due to a fault.

Remedy: If the airbag was not purposely disabled, arrange an inspection at ESP Servicing to check the airbag system.

Car Key Battery Low

Indicates: Common in modern vehicles, this warning shows that the key fob battery is nearly drained. This can be inconvenient, especially for cars with keyless ignition.

Remedy: Contact ESP Servicing to replace the battery or receive guidance on how to replace the battery.

Seatbelt Not Fastened

Indicates: The driver or a passenger has not secured their seatbelt. The system activates when weight is detected on a seat.

Remedy: Stop the vehicle safely until everyone has properly fastened their seatbelt. If it appears to be a malfunction, have the seatbelt system inspected promptly.

Handbrake On

Indicates: The handbrake is currently engaged while the engine is running. If the light stays on even after releasing it, there may be a braking system issue or low brake fluid.

Remedy: Confirm the handbrake is fully released. If it remains stuck, roadside assistance may be necessary.

Lane Assist Disabled

Indicates: Vehicles equipped with ADAS systems use lane assist to help keep the car within its lane. If the system disables unexpectedly, sensor problems may be the cause.

Remedy: Have the sensors inspected promptly, as faults may affect other safety features.

Engine Overheating

Indicates: Overheating is usually caused by low coolant levels or a malfunction in the cooling system. Older vehicles may also experience this during extreme heat.

Remedy: Continuing to drive with an overheated engine can lead to severe damage. Stop safely and allow it to cool before contacting ESP Servicing for a coolant assessment.

Bonnet Open

Indicates: Similar to the boot warning, this suggests the bonnet is not properly secured and could potentially open while driving.

Remedy: Pull over safely and check that it is firmly closed. If the latch mechanism fails, roadside help may be required.

Approaching Car or Object Ahead

Indicates: This alert warns that your vehicle is getting too close to the car or object in front.

Remedy: Slow down and maintain a safe distance. If the warning appears without any obstacle ahead, visit ESP Servicing for sensor diagnostics.

Check Engine Oil

Indicates: There may be too little or too much oil in the engine reservoir, both of which can affect performance and lubrication.

Remedy: Inspect the reservoir with the dipstick and either top up or carefully drive to ESP Servicing to get the oil replaced.

Parking Brake Engaged

Indicates: The parking brake in your automatic vehicle is active. In many cars this is controlled by a button, though older vehicles may still use a cable-based handbrake.

Remedy: If the parking brake refuses to disengage, contact roadside assistance for towing and repair.

Door Open

Indicates: One of the vehicle doors is not properly closed. In many cars, a warning sound may accompany this light when driving.

Remedy: Stop safely and ensure all doors are fully shut. If the alert continues, book an appointment to inspect the door sensors.

Power Steering Failure

Indicates: Steering assistance has stopped working, making the wheel much harder to turn.

Remedy: If steering is still manageable, drive cautiously to a garage. Otherwise pull over safely and request roadside help.

Amber Warning Lights

Powertrain Malfunction

Indicates: A fault within the powertrain system where the engine may continue running but with reduced power.

Remedy: Visit a garage for inspection and avoid aggressive acceleration or braking while driving there.

Traction Control

Indicates: If this appears during rain or on slippery roads, it means the traction control system is actively helping maintain grip.

If it activates during normal driving conditions, the system may be experiencing issues with sensors or settings.

Remedy: If the light behaves unusually or fails to appear during startup, have the system checked at a service centre.

Battery Range Low

Indicates: The battery in an electric vehicle is running low on charge.

Remedy: Use GPS to locate the nearest EV charging station. If the issue continues after charging, there may be an underlying issue that requires professional inspection.

More details about electric vehicle batteries can also be explored.

Rear Window Heating On

Indicates: The heated rear window is currently active, typically used to remove condensation or frost.

Remedy: Turn off the heating when it is no longer needed. If the indicator behaves abnormally, a technician may need to inspect the system.

ABS Malfunction

Indicates: A fault in the ABS (Anti Lock Braking System).

Remedy: The brakes will still function, but without ABS support. It is advisable to have the system repaired as soon as possible to maintain safe braking control.

Automatic Windscreen Wipers On

Indicates: The automatic wiper system is active and detecting rain on the windscreen.

Remedy: Turn off the automatic setting if not needed. If the indicator remains on, there could be a fault and the system should be inspected.

Automatic Start-Stop: Engine Off

Indicates: The engine has temporarily switched off while the vehicle remains powered, often when waiting at traffic lights.

Remedy: The engine will restart automatically when you press the clutch or accelerator. This feature is common in modern start-stop vehicles.

Tyre Pressure Low

Indicates: The pressure in your tyres has fallen below the recommended level. Since 2014, vehicles have been required to include Tyre Pressure Monitoring Systems (TPMS) to alert drivers when this occurs.

Remedy: It is recommended to inflate the tyres at a petrol station or service centre. Before doing so, check the manufacturer’s recommended pressure as it may vary between summer tyres and winter tyres. More details can be found on the tyre pressure information page.

Hill Start Assistance

Indicates: When illuminated, this shows that the Hill Start Assist system is active and helping prevent the car from rolling backward on steep slopes.

This feature often works alongside ABS to help control braking when starting on an incline. If the ABS warning light appears in amber, the Hill Start Assist system may not function fully.

Remedy: If this light fails to appear — either automatically or when activated manually — it may indicate that the hill descent control system is not functioning correctly. In this case, take your vehicle to ESP Servicing so technicians can identify and resolve the issue.

Fuel Level Low

Indicates: As the name implies, this orange light appears when your fuel level is getting low. In many vehicles, an audible alert may also accompany the warning. Once the fuel gauge enters the red zone, most cars have roughly 20–30 miles of fuel remaining, though some models may allow up to 50 miles. However, driving with very little fuel for extended periods is not advisable, as it increases the chance of running out completely.

Remedy: Head to the nearest petrol station and refill your tank. If the warning light remains on after refuelling, it may indicate a fuel tank leak or an issue with the fuel level sensor.

Fuel System Malfunction

Indicates: When this orange light appears, it usually means the fuel filter needs attention. The filter contains a sensor that measures the amount of water collected inside it, and the warning is triggered when the water level becomes too high.

In some vehicles, a valve at the bottom of the filter automatically drains the collected water. If the light appears despite this, it could mean the valve is faulty or the drain is blocked.

Remedy: This warning should not be ignored, as water in the filter may eventually reach the engine. Visit ESP Servicing so the filter can be inspected and drained if necessary.

Outside Temperature Low

Indicates: This light appears when the outside temperature drops below 4°C. It serves as a reminder that road conditions could be icy or slippery. Some modern vehicles may also display a warning message such as “Roads may be icy”.

Remedy: Adapt your driving style to the conditions. Avoid sudden braking, keep a safe distance from other vehicles, and drive at a reduced speed when necessary.

Blind Spot Monitor Disabled

Indicates: This light shows that the blind spot monitoring system has been switched off.

Remedy: Turn the blind spot monitoring feature back on to remove the warning. Keeping it enabled can help improve awareness of vehicles in hard-to-see areas.

Electronics Malfunction

Indicates: This warning indicates a problem with the vehicle’s electronic systems. It should not be ignored because it can affect how the car operates or even cause it to stop functioning.

Remedy: If the vehicle stops working, contact roadside assistance immediately. Otherwise, drive carefully to a service centre where technicians can diagnose the fault.

Slippery Warning

Indicates: Similar to the cold weather symbol, this light warns that road conditions may be slippery due to ice, snow, or wet surfaces.

Remedy: Drive cautiously and reduce speed, as slippery roads significantly increase braking distance and accident risk.

Headlight Height Adjustment

Indicates: This light suggests that the headlight height may need adjustment. For example, if your car is heavily loaded, adjusting the headlight angle can prevent glare for other road users.

Remedy: Adjust the headlights downward to reduce glare and ensure safe visibility.

Enter Clutch

Indicates: This symbol appears when the start-stop system has turned the engine off. It only appears in vehicles equipped with this feature.

Remedy: Press the clutch pedal and the engine will restart, causing the indicator to disappear.

Lamp or Rain Sensor Malfunction

Indicates: This orange warning may signal a problem with the automatic systems controlling headlights or windscreen wipers. The sensors responsible for detecting rain or darkness may not be working correctly.

Remedy: Have the sensors checked by a professional at a service centre.

Air Filter Dirty

Indicates: This light indicates that the cabin air filter (also known as the pollen filter) may be clogged or dirty. When airflow is restricted, it can affect engine performance and overall efficiency.

Remedy: Replace the filter as soon as possible. If you’re unsure how to do it, visit a service centre for assistance.

Air Suspension Malfunction

Indicates: This warning signals a possible issue with the vehicle’s air suspension system, which controls ride height and comfort.

Remedy: Drive carefully to a garage or service centre where specialists can inspect and repair the suspension system.

Rear Fog Lights On

Indicates: This light shows that the rear fog lights are currently turned on. These should only be used when visibility drops below about 50 metres.

Remedy: Turn the fog lights off once visibility improves to avoid dazzling other drivers.

Lighting problem

Indicates: One of the vehicle’s bulbs may have failed or is malfunctioning. This could involve headlights, brake lights, or other external lights.

Remedy: Inspect the lights around the vehicle to determine which bulb needs replacing and fix it promptly.

Engine Malfunction

Indicates: A fault has been detected in the engine management system or related electronics. If the symbol flashes, it may indicate issues such as engine misfires.

Remedy: Check engine oil and coolant levels immediately and have a technician perform a diagnostic check.

Emergency Run Active

Indicates: The car has entered “limp mode”, allowing it to move slowly without causing further damage until you reach a safe location.

Remedy: If possible, drive cautiously to a garage. Otherwise, contact roadside assistance.

Parking Sensors Enabled

Indicates: This light appears when the parking sensors are active. These sensors detect nearby objects and provide audible alerts to help with parking.

Remedy: The light will disappear if you turn off the parking sensors.

Rain Sensor Active

Indicates: This indicator shows that the rain sensor is active and will automatically trigger the windscreen wipers when rain is detected.

Remedy: The light will turn off once the rain sensor feature is disabled.

Worn Brake Pads

Indicates: This warning appears when the brake pads have worn down significantly and may soon need replacing.

Remedy: Replace the brake pads promptly to maintain safe braking performance.

Brake Light Malfunction

Indicates: One or both brake lights may not be working properly due to a malfunction.

Remedy: Replace the faulty bulb or have it repaired at a service centre, as working brake lights are essential for safety.

Diesel Particulate Filter Failure

Indicates: This light appears when the diesel particulate filter (DPF) becomes clogged or fails. This component helps reduce emissions in diesel engines.

Remedy: Have the filter inspected as soon as possible to prevent further damage to the engine.

Washer Fluid Level Low

Indicates: The windscreen washer fluid reservoir is nearly empty.

Remedy: Refill the washer fluid so the windscreen can be cleaned effectively.

Shock Absorber/Suspension Malfunction

Indicates: A fault has been detected in the suspension or shock absorber system.

Remedy: Visit a garage promptly so the suspension system can be inspected and repaired.

Key Is Missing

Indicates: In vehicles with keyless systems, this light may appear if the car cannot detect the key.

Remedy: Locate the key or bring it closer to the vehicle so it can be detected again.

Speed Limiter Activated

Indicates: A speed limiter has been activated, preventing the car from exceeding a preset speed.

Remedy: Turn off the speed limiter to remove the indicator.

Parking Heater Switched On

Indicates: The parking heater is active, warming the car before driving.

Remedy: The light will disappear when the parking heater is switched off.

Preheating Active

Indicates: In diesel vehicles, the glow plugs are heating the engine before startup.

Remedy: Wait a few seconds before starting the engine so the preheating process can complete.

Windscreen Defroster Active

Indicates: The windscreen defroster is running to remove fog or ice.

Remedy: Turn off the defroster once the windscreen is clear.

Water In Fuel

Indicates: Excess water has been detected in the fuel filter.

Remedy: Have the fuel system inspected quickly to prevent possible engine damage.

Green Warning Lights

Adaptive Cruise Control Enabled

Indicates: A white symbol appears when adaptive cruise control is switched on, while a green light indicates the system is actively maintaining speed and distance.

Remedy: The light will disappear when cruise control is turned off.

Cruise Control Engaged

Indicates: The cruise control feature is currently active and maintaining a steady speed.

Remedy: Press the brake or accelerator pedal to deactivate it.

Dipped Beam Turned On

Indicates: This light shows when the dipped headlights are turned on, typically used at night or during poor visibility.

Remedy: Switch the headlights off when they are no longer needed.

Depress or ‘Hold’ Brake Pedal

Indicates: The brake hold function is active in some automatic vehicles, keeping the car stationary without continuous pedal pressure.

Remedy: Turn off the hold function to remove the indicator.

Indicators Turned On

Indicates: The vehicle’s turn signals or hazard lights are currently in use.

Remedy: Cancel the signal or switch off the hazard lights when finished.

Side Lights Turned On

Indicates: The vehicle’s side or daytime running lights are active.

Remedy: Turn them off manually if required.

Blue Warning Lights

High Beam Turned On

Indicates: The high-beam headlights are currently active, providing stronger illumination for dark roads.

However, these lights can dazzle oncoming drivers, so they should be switched off when other vehicles approach.

Remedy: Turn off the high beams when they are no longer necessary.

Keep an eye out for dashboard lights

Understanding the warning lights on your dashboard can help you respond quickly to potential issues and keep your vehicle operating safely.

Whenever a warning light appears, take appropriate action as soon as possible. Regular maintenance and paying attention to dashboard indicators can help prevent larger mechanical problems and ensure a safer driving experience.

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