The caution sign on a car, often called a warning light, is your vehicle's primary way of alerting you to a potential problem with a specific system. The most common one is a yellow or orange symbol resembling an engine, which is the Check Engine Light. This light indicates an issue detected by the car's computer (the powertrain control module), ranging from a loose gas cap to a more serious engine misfire. Ignoring it can lead to decreased fuel efficiency or significant damage.
It's crucial to distinguish the color of the warning light. A red warning light typically signals a serious, immediate problem that requires stopping the car as soon as it is safe to do so. Examples include low oil pressure or an overheating engine. A yellow or orange light means you should have the vehicle diagnosed soon, but it may not be an immediate emergency. A green or blue light usually just indicates that a specific system, like headlights or cruise control, is active.
Here are some common caution signs and their general meanings:
| Warning Light Symbol | Common Name | What It Typically Means | Recommended Action |
|---|
| Check Engine Light | Issue with engine emissions, ignition, or fuel system. | Have the vehicle professionally scanned for diagnostic trouble codes (DTCs) soon. |
| Low Oil Pressure | Engine oil pressure is critically low. | Stop the engine immediately to prevent severe engine damage. |
| Engine Coolant Temperature | Engine is overheating. | Stop the car, turn off the engine, and let it cool down. Check coolant level when safe. |
| Charging System Alert | Battery is not charging; alternator may have failed. | Drive directly to a repair shop to avoid the battery draining and the car stalling. |
| Brake System Warning | Parking brake is engaged or there's a fault in the hydraulic brake system. | Check if the parking brake is fully released. If the light stays on, get the brakes inspected immediately. |
When a caution light illuminates, the first step is to stay calm. Safely pull over if it's red. Consult your owner's manual—it has a specific guide to all warning lights for your exact model. For any persistent light, especially the Check Engine Light, a quick trip to an auto parts store for a free code scan can provide the first clue about the nature of the problem before you see a mechanic.
