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What does the O/D OFF warning light mean?

1 Answers

DiHector

07/30/25 3:04am

When the O/D-OFF indicator light on the car's dashboard illuminates, it indicates that the vehicle's overdrive function has been deactivated. To turn off this indicator light, simply press the O/D button to activate the overdrive function. The specific steps are as follows: Open the driver's side door. Depress the brake pedal. Press the one-touch start button to start the engine. The dashboard lights up, confirming that the engine is running. Press the O/D button to complete the operation. To promptly detect faults in the electronic control unit and maintain the most basic operational capability of the automatic transmission in case of a fault, allowing the car to continue driving and facilitating workshop repairs, many modern electronic control automatic transmissions are equipped with self-diagnosis and fail-safe functions. The electronic control unit includes a dedicated self-diagnosis circuit that continuously monitors all sensors and some actuators in the automatic transmission's electronic control system while the car is in motion. If a sensor or actuator is found to be faulty or malfunctioning, the system will implement protective measures. While driving, if the automatic transmission warning light on the dashboard illuminates, it alerts the driver to immediately take the car to a workshop for inspection and repair. Currently, most vehicles use the overdrive indicator light "O/D-OFF" as the automatic transmission warning light. If the overdrive warning light remains on even after pressing the overdrive switch, it indicates a fault in the electronic control unit.

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