Check engine light Grand Cherokee on?

If the check engine light on your Grand Cherokee is illuminated, it indicates that the vehicle's onboard diagnostic system has detected an issue. Common causes can range from minor issues like a loose gas cap to more serious problems such as engine misfires or emissions system failures. It's advisable to use an OBD-II scanner to retrieve the trouble codes, which can help pinpoint the issue. If you're unsure or if the light persists, consult a professional mechanic for a thorough diagnosis and repair.