What are the reasons for an automatic car not moving when accelerating in D gear?
2 Answers
When an automatic transmission vehicle is in D gear and does not move, this situation can generally be attributed to the following scenarios: 1. Uneven road surface: There may be a slope in front of the car, obstacles or potholes in front of the tires, hindering the car's movement. The engine's idle speed is relatively low, and the corresponding power is weaker, insufficient to propel 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 car's power at idle speed cannot overcome this resistance. 3. Fault condition: If there is a transmission malfunction, it is advisable to visit a repair shop or a 4S store for a check-up, as the shift solenoid valve may be faulty. 4. Non-fault condition: Autohold (automatic parking) is a type of handbrake that hasn't been released. If the handbrake is not released, the car remains in a locked state and cannot move forward relying on the idle speed.
When encountering an automatic car not moving after shifting to D gear and stepping on the gas, as someone who drives frequently, I find this quite common. It's usually because the parking brake isn't fully released; or the transmission fluid level is too low, or the fluid quality has deteriorated, causing insufficient pressure; it could also be due to a faulty torque converter, clutch slippage, or an ECU control issue. Once, a friend's car had this problem, and it turned out to be the brake light sensor sending false signals to the system—a simple reset fixed it. However, forcing the car to drive in this condition is very dangerous, as it can easily damage the transmission and may also increase fuel consumption, affecting engine lifespan. It's recommended to pull over immediately, check the brakes and fluid levels, and if that doesn't help, call for roadside assistance. Regular transmission maintenance, such as changing the fluid every two years, can significantly reduce such issues. Cars are our daily commuting tools, and paying attention to these small details ensures a safer and more worry-free driving experience.
