Best Answer: The Eco light means your Variable Cylinder Management (VCM) is engaged and that you are using either 3 or 4 cylinders, and not all 6, thus saving fuel. This link explains it very well http://automobiles.honda.com/accord-seda... .est Answer: The Eco light means your Variable Cylinder Management (VCM) is engaged and that you are using either 3 or 4 cylinders, and not all 6, thus saving fuel. This link explains it very well http://automobiles.honda.com/accord-seda... .