What is the reason why the automatic D gear doesn't idle?

The following are the reasons why automatic D gear does not idle: 1, accessories failure: gearbox shift valve, solenoid valve, gearbox electronic module, engine throttle and other accessories have problems. 2. Operation problems: improper shifting, hand brake not released or not released to the end, etc. 3, the usual maintenance is not in place: the oil volume of the gearbox is too small, and the internal oil pressure cannot go up. 4. If the brakes are locked, the wheels will be unable to move forward, and there will be noise when refueling the door. Automatic transmission is introduced as follows: 1. An automatic car has five gears: P, R, N, D and L. P is the parking gear, R is the reverse gear, N is the neutral gear, D is the forward gear and L is the low gear. 2.L gear is mostly used for steep slopes, waterlogged roads, bumpy roads, speed-limited roads, congested roads and heavy-duty starting. 3. When the traffic lights such as automatic cars are blocked, it is recommended to hang neutral. If it takes a long time, you can also pull the hand brake. When waiting for the red light, putting on D gear and braking is equivalent to manually blocking the car, and stepping on the accelerator and braking at the same time. In this case, the oil consumption will increase, and the torque converter will be stressed for a long time, which will aggravate the damage of torque converter and other parts.