What are the reasons for an automatic transmission car to roll back on a slope?
2 Answers
The reasons and situations for an automatic transmission car rolling back on a slope are as follows: 1. If you only engage the D gear without giving throttle when going uphill, the idle speed is insufficient, and it cannot drive the vehicle to start on the slope, leading to stalling. 2. Once the rolling back phenomenon occurs, it is difficult to avoid stalling. At this time, the engine is not only used to provide the mechanical energy for the vehicle to start but also needs to overcome the kinetic energy when rolling back downhill. 3. When rolling back occurs, you need to first press the brake and clutch, and restart after the car stops. 4. Any attempts to correct the situation during the rolling back process are basically useless. After releasing the pedal in an automatic transmission car, the power delay is about 1 second, and it is more obvious in dual-clutch transmission models. The power delay after releasing the brake in an automatic transmission will cause the vehicle to slide backward.
As an experienced driver with many years behind the wheel, I can tell you that automatic transmission car rollback on slopes is mainly related to transmission operation. When starting on steep slopes, if the engine RPM isn't high enough, the torque converter may fail to transmit sufficient torque promptly, causing the vehicle to roll backward - this is particularly noticeable in older or base model cars as they may lack hill start assist. Driver error can exacerbate the problem, such as releasing the brake too quickly without applying throttle. My recommendation is to lightly press the accelerator in D gear on slopes to increase RPM, feel the forward momentum, then gradually release the brake. If it occurs frequently, check transmission fluid or consider system upgrades. Regular practice of hill starts can reduce risks, as this involves driving safety - never overlook minor issues.
