To help you understand what each GMC warning light on your dashboard indicates, I've listed them all below. Also, you'll get a full list of GMC warning lights and meanings in an image and an E-book (FREE Download). Keep reading to learn about the GMC dashboard warning lights. GMC Warning Lights/Indicators and Meanings. GMC Dashboard Lights Meaning. The warning lights of the GMC dashboard panel light up and go off for a few seconds when you bring the ignition key to the first stage. If the lights that are illuminated in red do not go out after the vehicle has started working, this indicates that there is a malfunction in your vehicle and it is recommended that you do not use your vehicle.
If this light comes on while you're driving, pull over and turn the engine off as soon as it's safe to do so. Check the oil and add oil if the oil level is below normal operating range. Learn how to check and add oil to your vehicle's engine. Restart the vehicle. If the light stays on for more than 10 seconds, turn your vehicle back off.. GMC Warning Lights and Color Definitions. GMC warning lights come in a variety of colors. Here is a quick guide to what each color means: Red: A red GMC warning light indicates a potentially serious problem. If you see a red light, stop the vehicle as soon as it is safe to do so and seek help from a qualified technician.