Reasons Why an Automatic Car Doesn't Move When in D Gear and Accelerator is Pressed
2 Answers
If an automatic car doesn't move after shifting to D gear and pressing the accelerator, it is likely caused by the following reasons: 1. Sensor error: The transmission shift valve position sensor signal is incorrect, causing the vehicle to fail to recognize the current gear; 2. Transmission malfunction: Issues with the shift valve, incomplete gear engagement, blocked oil passage; failure of the transmission solenoid valve and electronic module; insufficient transmission fluid or low internal oil pressure; 3. Brake malfunction: Brake lock-up preventing the wheels from moving forward, accompanied by abnormal noises when accelerating; parking brake not released or not fully released; engine failure.
I've been driving for almost thirty years, and I often encounter situations where the car won't move when the automatic transmission is in D gear and the accelerator is pressed. The most common issue is with the transmission fluid—low or dirty fluid can reduce efficiency, especially in cars that haven't had their fluid changed for a long time. Next is the braking system; if the brakes are stuck or not released, the car will be immobilized. Engine failure is also a likely cause, such as faulty spark plugs leading to insufficient power. Electronic components like the gear shift switch malfunctioning are more common in newer cars. It's advisable to pull over safely immediately, open the hood, and check fluid levels: transmission fluid, brake fluid, and engine oil to ensure they are normal. If you're unsure, don't force it—call a tow truck to take it to a professional shop for inspection. Regular maintenance, such as changing these fluids approximately every two years or 30,000 kilometers, can prevent such issues. Transmission repairs are expensive, so timely action can save a lot of money.