What are the reasons why an automatic transmission car doesn't move when pressing the accelerator in D gear?
4 Answers
If your vehicle doesn't move after shifting to D gear and pressing the accelerator, it is likely caused by the following reasons: 1. Sensor signal error: When the transmission shift valve position sensor signal is incorrect, the vehicle cannot detect which gear it is in. 2. Shift valve problem: The gear is not engaged properly, and the oil passage cannot open. 3. Transmission failure: The transmission solenoid valve or electronic module is malfunctioning. 4. Oil level issue: The transmission oil level is too low, or the internal oil pressure is too low. 5. Brake lock-up: This prevents the wheels from moving forward, and pressing the accelerator may produce abnormal noises. 6. Handbrake problem: The handbrake is not released or not fully loosened.
That day I was driving my friend's car, stepped on the gas pedal in D gear but the car didn't move at all. Honestly, my heart skipped a beat. This situation is quite common, don't panic first, let me teach you how to troubleshoot step by step. It's very likely that the gear lever appears to be in D gear but isn't fully engaged, try shifting it again; the electronic handbrake getting stuck can also cause this, especially in rainy weather when water can cause short circuits; is the engine fault light on? Sometimes the throttle is too dirty or the fuel injector is clogged, and the car won't respond even if you floor the gas pedal. The most worrying issue is transmission problems—if the oil seal is leaking or the valve body is stuck, you should immediately turn off the engine and call a tow truck, forcing it to drive will wear out the steel belt. Also, beginners often overlook that the auto start-stop function isn't turned off—if the engine isn't even started, of course the car won't move.
A while ago, my car had the same issue, and it turned out to be a faulty brake light switch. This part might seem insignificant, but it's connected to the transmission lock function—when it fails, the car gets stuck in neutral. Also, check the transmission fluid; if the level is too low or the fluid has turned black, it can cause the clutch plates to slip. If this happens during a cold start, there's a high chance the oil temperature sensor is giving false readings, putting the transmission into protection mode. Another possibility is a damaged CV joint—get out and check for oil leaks under the wheels. I recommend reading the fault codes first; most repair shops now have diagnostic tools that plug into the OBD port, which is much more reliable than blindly dismantling the transmission.
I once encountered this situation at a gas station and was sweating in a panic. Later, I found out that the child had randomly pressed and jammed the shift lock button. Actually, pressing and holding the unlock button can solve the problem. If the steering wheel isn't straightened, it can also trigger the protection program. Try turning the steering wheel fully to the left and right. A frozen transmission computer is also a common cause; first, turn off the engine and wait five minutes for the system to reset. If you smell a burnt odor, the clutch might be burnt out, and you should stop immediately to check. Beginners often forget to release the electronic handbrake or don't press the accelerator deeply enough to disengage the auto-hold function. Finally, remember to check the dashboard prompts, as there's usually a small icon indicating the fault location.
