ODO stands for Odometer. OD stands for Overdrive. You cannot turn the odometer off, but can hide the display on some vehicles. So it would seem this is telling you the Overdrive is turned off. Look for a button on the shift lever to turn it back on.
odometer
If the rest of the Transmission continues to function, then result is that the engine RPM's will be higher when cruising than is normal. Overdrive reduces the RPM's at the speed where it engages.
If your car odo uses a metric odo, then the last digit of the trip odo will most likely be in 1/10 of a kilometer = 100 meters. So watch the last digit while driving fairly slowly and count the numbers.
If an automatic car is in off overdrive does it save fuel
if you have overdrive in that car it means that your about to go into overdrive
If the odo hasn't been tampered with it'll show the total distance the car has travelled.
Depends. If you've changed the gearing, or the wheel size, odometer correction is a small adjustment to make the odo read right again after the changes. If you're selling/buying a used car, odo correction can mean that the odo has been turned back in order to make the car look less used, to get a better price from it.
The car needs to go into overdrive unless you are towing something heavy which makes it shift between overdrive and non overdrive. It is better to allow the car to shift into overdrive.
Odo of Metz was born in 742.
If the overdrive switch is turned off then the car will not go into overdrive. As it is not in overdrive, then it will not downshift out of overdrive as it normally would. It also will not shift to 3rd gear above a certain factory preset speed. Turn th overdrive on and see if it operates normally.
Odo was never the pope.