Why does the automatic transmission not move when shifted to D gear?

[SanCalvin]

Automatic transmission not moving when shifted to D gear may be caused by damage to the shift control mechanism of the automatic transmission. Although the shift lever has been moved to D gear, the actual control mechanism does not respond, resulting in the car being unable to move forward. In such cases, the shift control mechanism of the automatic transmission should be inspected. Automatic transmissions have internal shift control mechanisms that do not require driver intervention for shifting. Problems with the shift control mechanism can lead to situations where the transmission does not move in D gear or R gear. The shift control mechanism of an automatic transmission is called the valve body, which contains oil passages, numerous solenoid valves, and the transmission control computer. If the valve body is damaged, the replacement cost can be very high. Most automatic transmission failures are caused by improper operation or inadequate maintenance. Automatic transmission fluid needs to be replaced regularly; failure to do so over a long period may result in damage to the transmission's control mechanism.