You can thoroughly check the status of the overdrive quickly. You need to change from the state of the product moving on the highway. When speed increases, Overdrive turns off, vice versa if speed decreases, Overdrive is on.
Initially, when not starting, your transmission will be in low gear. Then, if you want to move on the road, use the accelerator and brake the engine. At the same time, depending on the terrain, you can turn OD on or off if you want.
If the OD light does not turn off, you can take your car to a repair shop that will have a technician check it out for you.