Flashing vs. Steadily Illuminated Check Engine Light
Is It Time for a CEL Diagnostics Service?
What Is the Check Engine Light?
When that little orange light on your dashboard comes on, it can cause anything from mild annoyance to outright panic. While it’s tempting to ignore it, especially if your vehicle seems to be driving fine, the CEL is a critical communication tool from your car’s computer system. At Capitol Transmission in Hartford, CT, our team specializes in CEL diagnostics. It can quickly determine whether your car’s issue is urgent or minor. One key detail we help our customers understand is the difference between a flashing and a steadily illuminated check engine light.
The check engine light (CEL) is part of your car’s onboard diagnostics system. It monitors components related to the engine and emissions systems, including the catalytic converter, spark plugs, fuel injectors, oxygen sensors, and more. When a fault is detected, the computer stores a diagnostic trouble code (DTC) and activates the CEL.
But how that light behaves greatly affects how urgently you should respond.
Flashing CEL vs. Steady CEL
If your check engine light is flashing, this indicates a serious and potentially damaging issue that requires immediate attention. The most common cause of a flashing CEL is engine misfire, which can cause unburned fuel to be dumped into the exhaust system. This can quickly overheat and damage the catalytic converter, one of the most expensive parts to replace in your emissions system. Common causes of this include:
- Engine misfire
- A faulty ignition coil or spark plug
- Fuel system problems
- Major emissions system failure
A steadily glowing check engine light means your vehicle’s computer has detected a fault, but it’s not immediately damaging. The car may still drive normally, but fuel economy may drop, or emissions could rise. While not usually urgent, this warning should not be ignored for long.
- Common causes of this issue are:
- Loose or faulty gas cap
- Faulty oxygen sensor
- Worn-out catalytic converter
- Failing mass airflow sensor
- Vacuum leaks
Don’t Ignore That Light
Whether your check engine light is flashing or steadily illuminated, it’s your vehicle’s way of asking for help. Even if things “seem fine,” continuing to drive with an active CEL can lead to reduced performance, increased emissions, and expensive repairs.
At Capitol Transmission in Hartford, CT, we’re here to take the mystery out of dashboard warning lights. If your CEL is on, schedule a diagnostic today, and let us give you the peace of mind you deserve. Call us at (860) 953-9155 to schedule a CEL diagnostics appointment. You and your car are in good hands with us.