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lots of mazda vehicles have a small button on the shifter, usually on the side or somewhere not very visible. Generally overdrive is actually ON and pressing the button will turn on a light that indicates Overdrive is OFF. since overdrive is kind of a passing gear - if you are going uphill or towing something and do not want the vehicle to shift to a higher, larger gear, you would turn overdrive OFF .
That is the transmission overdrive indicator light. On the left side of the gear-shift handle, you'll see a small button marked "O/D." This is the button used to toggle between "Overdrive On" and "Overdrive Off." Push the button to turn on the overdrive. If overdrive was already on, pushing the button turns it off.
This is the "overdrive" on or off indicator light. When it says "OD off", means that overdrive is off and transmission is in 3rd gear. When it's "on" then transmission will shift into 4th gear or "Overdrive". The engine will turn slower using less fuel for better economy.
O/D off is indicating that your overdrive has been disabled or turned off. if your vehicle is equipped with overdrive and this is happening then it usually means that overdriver is not engaging properly.
if your vehicle is not eqquipped with overdrive and is happening usually will indicate an electrical short
either way you should consider taking to mechanic shop