Seeing the check engine light pop on can feel stressful—especially during the heat of summer. Whether you’re heading out on a road trip or just commuting to work, it’s never convenient. But don’t panic. That little light is your car’s way of telling you something needs attention. In this blog, we’ll explain what to do if your check engine light comes on in the summer, how the heat affects your engine, and why quick action can prevent major repair bills later.
Why Does the Check Engine Light Come On?
The check engine light (CEL) is part of your vehicle’s onboard diagnostics system (OBD-II). It’s connected to various sensors and components throughout the engine, exhaust, and emissions system. If something goes wrong—like a misfire, faulty oxygen sensor, or loose gas cap—the system triggers the CEL.
In summer, high temperatures can place extra strain on your vehicle’s systems, especially:
- The cooling system
- Battery and alternator
- Emissions control
- Fuel system
These areas are more prone to issues in extreme heat, and that’s often why the light comes on during the warmer months.
What Should You Do First?
1. Check the Gas Cap
Believe it or not, a loose or damaged gas cap is one of the most common reasons the check engine light comes on. It affects the fuel system’s pressure and can trigger an emissions fault. Remove the gas cap and re-tighten it until you hear a click. If the light doesn’t go off after a few drives, something else is likely the problem.
2. Pay Attention to Other Warning Signs
Is the car driving differently? Are you hearing odd sounds, feeling vibrations, or noticing a drop in performance? Any of these could point to a more serious issue. If the check engine light is blinking rather than solid, pull over and shut off the engine. A blinking light usually means a severe misfire or other major engine problem.
3. Don’t Ignore It
Even if your car seems to be driving normally, ignoring the light can lead to expensive repairs. For example, a faulty oxygen sensor left unaddressed can damage your catalytic converter, which is a much more expensive part.
4. Get a Diagnostic Scan
Auto repair shops like Morisette Automotive can run a quick diagnostic scan to read the trouble codes from your car’s computer. These codes tell technicians exactly what triggered the light and where the problem is coming from. It’s a simple process that takes just minutes and could save you a lot of money and hassle.
How Summer Heat Makes Problems Worse
Hot temperatures can make minor issues worse. For example:
- Overheating can lead to head gasket damage.
- Failing sensors may give false readings due to excess heat.
- Old batteries can lose charge more quickly.
- Engine oil may thin out in the heat, reducing protection.
If your engine is already under stress, the heat may push it past its limits. That’s why summer is a common time for the check engine light to appear.
Common Questions About the Check Engine Light
Q: Can I keep driving if the check engine light is on?
A: If the light is solid and the car runs fine, it’s usually safe for short trips. But get it checked soon. If it’s blinking, stop driving and have it towed.
Q: How long can I drive before checking it out?
A: It’s best not to wait more than a few days, even if nothing seems wrong. Small problems can quickly become big ones.
Q: Will disconnecting the battery turn the light off?
A: Maybe, but it doesn’t fix the underlying issue. The light will likely return unless the problem is addressed.
Trust Your Local Auto Repair Experts
At Morisette Automotive, we help drivers in Chesterfield Township, Royal Oak, and St. Clair Shores stay safe on the road all summer long. If your check engine light is on, we’ll pinpoint the issue quickly and offer reliable repairs to get you back on the road with peace of mind.
Don’t wait—book an inspection today and avoid bigger problems tomorrow.