What Causes an Automatic Car to Suddenly Stop While Driving?

[McTanner]

While driving, you may suddenly feel a deterioration in acceleration performance, as if the transmission has shifted into neutral, causing the car to gradually come to a stop; or the car may not move when starting in gear. When diagnosing the issue, the first step is to determine the location of the fault. You can start by checking the condition of the two rear wheels. If both rear wheels are dislodged, it could be due to a broken axle housing or the wheel bearing lock nut coming loose. If everything appears normal, the issue should be assessed based on the behavior of the driveshaft when starting in gear. Below is some relevant information about the transmission: 1. Introduction: A device that changes the speed ratio and direction of motion. It is used to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. A gear-driven transmission typically consists of a housing and several gear pairs. 2. Function: While driving, to adapt to varying conditions, the car's driving force and speed need to change within a certain range. However, the existing engine's torque and speed variation range cannot meet this requirement, hence the need for a transmission.