Why does an automatic transmission car not move at idle and requires throttle to move?

1 Answers
RachelRose
07/29/25 5:05pm
Here are the reasons why an automatic transmission car does not move at idle and requires throttle to move: 1. Uneven road: There might be a slope in front of the car, obstacles in front of the tires, or potholes that hinder the car's movement. The engine's idle speed is relatively low, and the corresponding power is also weaker, insufficient to push the car forward against the resistance. 2. Rusty brake discs: Brake discs are made of iron and can easily rust after rain or car washing, creating significant resistance. The power at idle speed cannot overcome this resistance. 3. Fault condition: If there are no obstacles in front of the car, the brake discs are not rusty, there is no autohold function, and the handbrake is not engaged, then the only possibility is a transmission fault. In this case, it is recommended to visit a repair shop or a 4S store for an inspection, as the shift solenoid valve might be faulty.
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