Why does an automatic transmission car not move when shifted to D gear and accelerating?

[Brady]

Automatic transmission cars not moving when shifted to D gear and accelerating is mainly due to: When the transmission shift valve position sensor signal is incorrect: The system cannot detect which gear it is in. If the shift valve malfunctions: The gear is not fully engaged, and the oil passage does not open. Here is some additional information: Automatic transmission cars typically use a hydraulic transmission device to replace the mechanical clutch of manual transmission cars, so there is no clutch pedal. When the engine speed is low, the torque transmitted by the fluid is limited and insufficient to propel the car forward. When the gear lever is placed in the drive position and the brake pedal is released, as the accelerator is pressed and the engine speed increases, the transmitted torque increases, pushing the car forward.