The OD button means "Over Drive", off or on.
overdrive off
NO, OD off is mainly for increased braking/control when towing.
od light is the overdrive unit on the transmission. If you drive on the freeway you should have the overdrive unit on, on the streets the unit should be off. The light usually doesn't have anything to do with overheating. I would look for some other issue.
o/d off
You might have accidentally clicked the overdrive button on your gearshift. The OD off indicates that your car will not shift into overdrive. It is useful to turn your overdrive off if you need to use engine braking to drive in hilly areas. Otherwise, it just wastes gas.
Check to make sure the light says "OB OFF" and not "OD OFF." If the car is an automatic and not a standard, that just means your overdrive feature is turned off. There is a button on the left of the gear selector that switches the function on and off. Check to make sure the light says "OB OFF" and not "OD OFF." If the car is an automatic and not a standard, that just means your overdrive feature is turned off. There is a button on the left of the gear selector that switches the function on and off.
OverDrive Off
it means the overdrive is not on.
there is a button on the gearshift or on 1 of the shifter rods on steering column
There is a problem with the Overdrive. Seek professional help.
Overdrive off