Why does the car move backward when in drive gear?

[GeorgeDella]

Because the engine's power and the reverse motion resistance of the transmission shaft are absorbed by the torque converter. Here are the specific details of related content: 1. Possible causes: It may be caused by a faulty transmission gear position sensor, valve body failure, or shift mechanism malfunction. Essentially, rolling backward on a slope means the car doesn't have enough power to climb, causing it to roll back. Alternatively, if the car is heavily loaded, the resistance might exceed the engine's output power. 2. Solutions: Automatic transmissions usually have a delay of more than 1 second! After shifting into drive gear, do not release the brake immediately, and the car won't roll backward. When rolling occurs, the correct approach is to brake promptly. If equipped with a hill-start assist system, wait for the system to function properly before starting again.