Why does an automatic transmission car not move when pressing the accelerator in D gear?

[StephanieLynn]

Automatic transmission car does not move when pressing the accelerator in D gear mainly due to the following reasons: If the driveshaft rotates but the car cannot move, the fault lies in the rear axle: Jack up the rear axle. When turning one rear wheel, if the driveshaft does not rotate and the other rear wheel rotates in reverse, it indicates that all the rivets of the driven bevel gear are sheared off. If the other rear wheel also does not rotate, the half shaft should be disassembled and inspected to see if it is broken. If the driveshaft does not rotate when the transmission is in a certain gear after the car starts, the fault lies in the transmission: The transmission cover should be removed to check whether the transmission fork is broken or the guide block fixing screws are loose. If the driveshaft does not rotate in any gear of the transmission, the fault lies in the clutch: Check whether the clutch slips severely, whether all the spline teeth rivets between the clutch driven plate and the steel plate are sheared off, or whether the steel plate is fractured.

[VanJayla]

I've been driving for over a decade and have encountered several instances where an automatic transmission car wouldn't move when pressing the accelerator in D gear. There are actually many possible causes. The most common is that the engine isn't started at all—you might have turned the key but failed to ignite, or the car hasn't fully warmed up. Transmission issues are another key factor, such as a faulty gear position sensor or control module malfunction preventing signal transmission. Another possibility is the parking brake being stuck and not released, which locks the wheels; or when the battery charge is too low, the car's systems simply shut down. Safety first—if this happens, pull over immediately and check the dashboard for any warning lights; it's best to go directly to a repair shop and let a technician inspect it rather than risk driving and causing bigger problems. Regular maintenance of transmission fluid and sensors can prevent this issue—don't wait until it worsens to address it.

[DamianDella]

As a car enthusiast, I think this issue can be analyzed from both mechanical and electronic perspectives. First, there might be a malfunction in the transmission electronic control system, such as the TCU (Transmission Control Unit) receiving incorrect signals, causing gear shifting to fail; or insufficient hydraulic pressure in the valve body, leading to gears not engaging properly. Second, the engine ECU might not be responding to throttle signals, possibly due to a stuck throttle or dirty sensors. If the car has been modified with electronic accessories, it could also easily cause conflicts or short circuits. I recommend using an OBD diagnostic tool to connect to the car's interface and read the fault codes; check if the transmission fluid level is low, as this can affect lubrication and pressure transmission. When driving, it's advisable to operate gently and avoid sudden acceleration to prolong the transmission's lifespan and reduce the occurrence of such issues.

[Pamela]

I'm a new driver, and the last time I encountered this issue, it scared me so much I broke out in a cold sweat! Maybe I forgot to fully start the engine, or perhaps the handbrake wasn't released, causing the wheels to lock up. If the battery is low on charge, the engine won't turn over either. First, pull over to the side and perform a safety check: see if the dashboard lights are on, is the ignition switch turned all the way? If everything seems fine, it might be best to seek help from a mechanic to avoid the danger of breaking down halfway.

[AliyahMarie]

I just bought an automatic transmission car and encountered this annoying issue, which actually has several common causes. The most frequent one is shifting to D gear before the engine starts when you turn on the car—check if the key is turned to the ignition position. Another common issue is the gearshift mechanism getting stuck, such as when the car has been parked for too long, causing oil pressure to drop and gears to stick together. Forgetting to release the handbrake can prevent the wheels from moving, while low battery voltage can paralyze the entire system. That time, after pulling over, I stepped on the gas pedal a few times to test the operation, then restarted the car and was able to drive again. Safety first—stop immediately to address the issue; regular fluid checks and maintenance can prevent similar failures from occurring.

[VonHarper]

I've been driving for most of my life, and it's not uncommon for automatic transmissions to fail to move when the accelerator is pressed in D gear. Common causes include the engine not starting or insufficient warm-up; aging transmission sensors leading to signal loss; or the handbrake being locked and not released. If the battery is dead, the system will shut down. Remember to first check if the key is in the ON position and whether the dashboard warning lights are on. Safely pull over and try restarting the car; avoid forcing it to drive to prevent damage to the transmission. Regularly change the transmission fluid for maintenance and maintain driving habits to avoid sudden stops and starts.