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

[MacGrant]

The main reasons why an automatic transmission car does not move when shifted to D gear and accelerating are: 1. When the transmission shift valve position sensor signal is incorrect: it cannot sense which gear it is in. 2. Problems with the shift valve: the gear is not engaged properly, and the oil passage cannot open. Here are some additional explanations: 1. Automatic transmission cars usually use hydraulic transmission devices 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. 2. When the shift lever is placed in the forward gear and the brake pedal is released, as the accelerator is pressed and the engine speed increases, the transmitted torque increases, pushing the car forward.