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Why doesn't an automatic transmission car move when idling without giving gas?

2 Answers

CarolineRose

07/25/25 2:48pm

The reasons why an automatic transmission car doesn't move when idling without giving gas are: 1. Uneven road surface: There may 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 are prone to rust after rain or car washing. At this time, the resistance is greater, and the power during idle speed cannot overcome the resistance. The method of using the automatic transmission electronic parking brake is: 1. Step on the brake, and with the vehicle stationary, pull up the electronic parking brake button to activate it; 2. Step on the brake, and with the vehicle stationary, press down the electronic parking brake button to release it.

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LeCorey

08/11/25 9:14pm

I've been driving automatic transmission cars for many years and have encountered situations where the car doesn't move when idling without giving it gas. This is usually normal because the idle speed is set too low, and the engine's power output isn't sufficient to drive the wheels to start moving. Especially on flat roads with no load on the car, this is more likely to happen. However, if the car used to move but suddenly doesn't anymore, it could be a sign of a problem. The most common issues are a dirty or clogged idle control valve or throttle body, leading to poor air-fuel mixture and inability to increase RPM. Another possibility is deteriorated transmission fluid, causing the torque converter to slip and fail to transfer power effectively. Another reason could be a faulty throttle position sensor, causing the car to remain unresponsive without input. In such cases, I recommend not forcing it and trying a simple throttle body cleaning first. If that doesn't work, take it to a professional shop as soon as possible to check the idle system and electronic control unit to ensure driving safety. For daily driving, regular oil and transmission fluid changes can help prevent such issues.

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