Your car may not say much, but its dashboard does. From an overheating engine to a low tire, those mysterious symbols are trying to tell you something. Here’s how to decode the most common warning lights—and know when to stop.
Your car is generally not very chatty. It does not complain when you choose the same playlist fifth road trip in a row. It does not question why there are three empty coffee cups in the cupholders. It rarely comments on your parallel parking.
So when it lights up a symbol on the dashboard, perhaps we should listen.
Unfortunately, dashboard warning lights sometimes look like tiny hieroglyphics designed by someone who really enjoyed puzzles.
Here is what some of the common ones are trying to tell you.
If your engine temperature warning appears, your car is not commenting on the weather. The engine may be overheating. Find somewhere safe to stop, turn off the engine and allow it to cool.
And, as we have mentioned before, do not immediately open the radiator or coolant cap while everything is hot.
Hor, pressurized coolant and bare hands are not a combination we recommend. If the warning remains or you notice steam, contact roadside assistance or your rental provider.
Your engine has already voted that your destination can wait.
You know the symbol. It looks slightly like a magic lamp. Sadly, rubbing it will not produce three wishes.
An oil pressure warning can indicate a serious lubrication problem, and continuing to drive could damage the engine. If the red oil warning appears while driving, pull over safely and switch off the engine. Then seek professional assistance.
Wish number one: please let this be an easy fix.
That horseshoe shaped symbol with an exclamation point usually relates to tire pressure.
Temperature changes, a slow puncture or simply gradual air loss can trigger it. Find a safe place to inspect the tires and check their pressures against the vehicle’s recommended values. If a tire looks visibly damaged or is losing pressure quickly, do not keep driving on it. This is not a “we’ll see how it goes” situation.
Relatable. The battery warning usually indicates a problem with the vehicle’s charging system rather than simply telling you the battery is old. If it stays illuminated while driving, some electrical systems may eventually stop working. Head somewhere safe and contact assistance.
And perhaps avoid testing whether the heated seats still work.
Priorities.
The famous check-engine light. Essentially the automotive equivalent of receiving a text saying: “Can we talk?”
Helpful. Sometimes the cause is relatively minor. Sometimes it is not. If the light appears steadily and the car otherwise behaves normally, you should still have the vehicle checked promptly. If it flashes, or the vehicle is losing power, shaking or behaving unusually, stop driving safely and contact assistance.
Ignoring it because “the car still moves” is not diagnostics.
We have all played this game.
The fuel warning appears. You immediately become a mathematician. “Okay, if the car uses approximately this much per 100 kilometers and the next station is…” No. Stop. Just find fuel. Driving very low on fuel is unnecessary stress, especially somewhere unfamiliar or on a rural road.
Your road trip should contain scenic suspense. Not fuel suspense.
A brake-system warning deserves immediate attention. First, check whether the parking brake is fully released. If the warning remains on, particularly if braking feels different, pull over somewhere safe and contact professional assistance.
This is not the warning light to negotiate with.
Some dashboard lights simply tell you that a system is active. Your high beams, fog lights or cruise control indicators, for example, are informational rather than emergency warnings. The important trick is understanding the colours.
As a general rule:
Green or blue: usually information or a system currently operating.
Yellow or amber: something needs attention.
Red: take it seriously and check what is happening as soon as it is safe.
Exact symbols and meanings can vary between vehicles, so your vehicle manual remains the best source for that specific car. Yes. We know. Reading the manual is not very exciting. Neither is waiting for a tow truck.
Do not suddenly discover your inner mechanic. If an unfamiliar warning appears in a rental vehicle, safely stop when necessary and contact the rental company or roadside-assistance provider for instructions. Trying to repair something yourself could create additional problems. You rented the car. You did not audition for Formula 1 engineering.
Your car does communicate. Just very dramatically. Most drives happen without a single warning light appearing. But knowing what the common symbols mean helps you react calmly if one does show up.
So next time something illuminates on the dashboard, resist the ancient driving technique of “maybe if I ignore it, it will disappear.” Your car has something to say. It might be worth listening.