eco/power

Should be explained in your owner's manual, check here http://repairpal.com/automobile-owners-manuals-online or try this link you may be able to down load a free copy of the owner's manual for your vehicle http://www.autousermanual.com/ It basically controls transmission shift points maybe even engine management strategy to allow for more power (say over taking or driving in the mountains) or gives economical fuel use by altering transmission shift points.