What is the reason for an automatic transmission car not moving when shifted to D gear?

[StDallas]

Because after an automatic transmission car stalls, the engine stops rotating immediately, even if it is in D gear. The reasons for an automatic transmission car not moving when shifted to D gear are as follows: Torque converter: The torque converter shaft is seized, causing the fuel injection pump to stop working. Lubricating oil: The lubricating oil passage is blocked, leading to insufficient lubrication, which results in the planetary gear carrier being burned out. Oil pump shaft: The oil pump shaft is broken, causing the oil pump to stop working or the differential to lack oil and burn out. Transmission: The transmission oil pan is damaged, causing all the transmission oil to leak out and resulting in vehicle issues. Solenoid valve: The transmission valve body or solenoid valve is damaged and not functioning. Loose linkage: The linkage or cable between the shift control handle and the manual valve rocker arm is loose, keeping the manual valve in the neutral or parking position.

[VanSebastian]

I've been driving automatic transmission cars for over a decade and have encountered many cases where the car won't move in D gear. There are usually several possibilities. The most common is when the handbrake or brakes are stuck and not fully released, preventing the car from moving, especially after parking on a slope. Then there's insufficient or overly dirty transmission fluid, where inadequate oil pressure leads to power transmission failure - often caused by long-term neglect of fluid changes or leaks. Another possibility is a faulty gear position sensor; if the car can't detect the D gear signal, it will refuse to move. When facing such issues, don't force it - try turning off the engine and restarting first. If it still won't move, you'll need to visit a shop to check oil pressure and electronic systems. Regular monthly fluid inspections can prevent such surprises, as driving safety is paramount, and delayed repairs might cause more severe transmission damage.

[StEden]

As someone who frequently works on my own car, I believe that the inability to move when in D gear is often rooted in transmission issues. Problems with the hydraulic system, such as a failed oil pump or clogged oil passages, can lead to insufficient pressure, preventing the gears from turning. It could also be due to severely worn clutch components, which fail to engage properly. Additionally, if the electronic control unit is malfunctioning, the car won't receive the shift command and will remain stationary. Another common mistake is the engine not running fully, possibly due to ignition system failures that interrupt power transmission. I recommend first checking if any warning lights on the dashboard are illuminated and cleaning any dust around the gear lever area. If the issue persists, it's best to consult a professional mechanic immediately and have the car towed to a repair shop for a thorough inspection of the assembly, to prevent minor issues from escalating into major repairs.

[DeMargaret]

When I first learned to drive, I also encountered the situation where the car wouldn't move in D gear, which was quite scary. Possible reasons include the handbrake not being fully released, requiring a check if the lever is stuck; or the transmission fluid being too low, unable to maintain operating pressure; or perhaps a sensor malfunction causing the car to misinterpret signals. My approach at the time was to turn off and restart the engine, observing if the dashboard indicators returned to normal. In short, upon discovering such an issue, immediately turn on the hazard lights and pull over. Avoid further attempts to prevent part damage, then contact a repair shop for assistance. Stay calm and prioritize safety above all.

[SanHaley]

With over 30 years of driving experience, I can say that the issue of a car not moving when in D gear often stems from maintenance neglect. For instance, prolonged failure to change transmission oil can lead to carbon buildup blocking internal oil passages, resulting in insufficient hydraulic pressure to move the vehicle. Brake system jams or overly tight parking brakes can also trigger the protection mechanism, preventing movement. In rare cases, it might be due to a damp or aged gear position sensor malfunctioning. From my experience, when encountering this issue, try shifting gears a few times first to listen for any unusual noises. If there's no response, avoid forcing the car to move. Address oil changes or part replacements promptly, as delays only lead to costlier repairs. This malfunction during driving can easily cause accidents.

[Peggy]

For car enthusiasts, the core issue when the car doesn't move in D gear lies in the coordination between electronics and mechanics. Common causes include TCM module control errors, where the transmission locks due to misjudged shift signals; insufficient hydraulic pump pressure or overheating leading to internal component failure; or parking brake mechanism malfunctions forcing the car to stop. It's advisable to first check if the battery voltage is normal, as it affects the electronic system, or try repeatedly shifting gears over a short distance to reset. If problems are found, don't hesitate—diagnose promptly to prevent overall system deterioration. Regular maintenance can significantly reduce such troubles.