Dashboard Warning Lights: What to Do When One Comes On

A warning light coming on can be startling, especially on the highway or somewhere unfamiliar. The good news is that a clear-headed response usually takes just a minute or two, and it puts you in a much stronger position when you do talk to a mechanic.

Colour and behaviour matter more than the icon

Generally, red warning lights call for more caution than amber or yellow ones, and a flashing light usually signals something more urgent than a steady one. Rather than searching online for what a particular icon means — generic guides can't know your specific vehicle — check your owner's manual, which describes exactly what that light means for your make and model and what it recommends you do.

When to pull over

If you notice a loss of oil pressure, overheating, a change in braking or steering feel, or any flashing warning light, find a safe place to pull over as soon as you reasonably can. Continuing to drive with these symptoms risks turning a repairable problem into a much more expensive one, or a genuinely unsafe situation.

What to note before you call anyone

Take a moment to note a few details: the exact symbol and any accompanying message, when it first appeared, and anything else you noticed — an unusual sound, a smell, or a change in how the car handles. If it's safe to do so, you can check fluid levels, but don't feel you need to open the hood if you're not comfortable doing so. A photo of the dashboard display on your phone is genuinely useful information for a mechanic.

Don't just clear the code to make it go away

It can be tempting to disconnect the battery or ask for the code to simply be cleared so the light turns off. Resist this — clearing the fault can erase information a technician needs to diagnose the problem properly, meaning you may end up paying for a longer diagnostic visit later to rediscover what was already known.

Some lights allow careful driving; others don't

Not every warning light means stop immediately. Some manufacturers' guidance allows continued, cautious driving to reach a service appointment, while others call for towing. This is exactly the kind of judgment call your owner's manual is built to answer, so it's worth keeping a copy in the glovebox or as a photo on your phone rather than relying on memory or an online search.

Questions to ask when you bring the car in

• Was the light steady, flashing, amber, or red?
• What does my owner's manual say to do in this situation?
• Are there any braking, steering, or overheating symptoms I should be worried about?
• Should the car be towed rather than driven to your shop?

Peace of mind is worth the phone call

If you're at all unsure whether it's safe to keep driving, it's always reasonable to call your mechanic, a roadside assistance line, or CAA and describe what you're seeing before deciding what to do next. Being cautious with a warning light is never something to feel embarrassed about — it's exactly the kind of informed, careful response that protects both your safety and your wallet.