Does stalling an automatic transmission in Drive (D) gear harm the car?

[LeHaley]

No impact on the vehicle. Here's relevant information: 1. For automatic transmission vehicles during driving, it's generally impossible to stall the engine in Drive (D) gear. If it occasionally stalls while still in D gear, there's no harm to the car - the only consequence is you can't remove the key unless in Park (P) gear. Simply power on and shift to P gear afterward. 2. Many modern vehicles feature automatic start-stop systems where the engine automatically shuts off when braking for over one second at traffic lights (while remaining in D gear), which is completely normal as the computer handles all background operations. The engine automatically restarts when you press the accelerator again.

[JudahAnn]

After driving for so many years, I've found that turning off the engine while the automatic transmission is still in D gear can indeed harm the car. This is mainly due to the internal structure of the transmission. When the engine suddenly stops running but the gear remains in the drive position, the transmission fluid pump loses power, causing a sharp drop in oil pressure. This can lead to poor engagement of internal clutches and gears, resulting in additional friction and wear. In the short term, doing this occasionally may not cause significant issues, and the car can still operate. However, long-term practice can accelerate part aging, such as damage to transmission seals or deterioration of transmission fluid. In severe cases, it might require major repairs, and replacing a transmission isn't cheap. That's why I always make it a habit to shift to P or N gear before turning off the engine, ensuring a smooth transition and avoiding unnecessary wear. Additionally, starting the car in D gear is even more dangerous, as it can cause sudden lurching forward—safety always comes first when driving.

[EmilianoLee]

I am particularly cautious about car maintenance. The biggest risk of stalling an automatic transmission in D gear is a safety hazard. If the car is parked on a slope, the brakes may release after stalling, causing the vehicle to roll and collide with obstacles or pedestrians. Even on flat ground, if the gear is not shifted when restarting, the engine ignition moment may cause transmission impact, increasing wear over time. From my experience, I recommend firmly pressing the brake when parking, immediately shifting to P gear, and then stalling. This protects the transmission fluid system and prevents damage caused by insufficient oil pressure. Occasionally forgetting once is not too much to worry about—cars aren’t that delicate—but developing good habits can avoid repair troubles, saving money and ensuring safety. Remember to check the transmission fluid level during regular maintenance to ensure it’s in good condition.

[VanJosephine]

As an average car owner, I once turned off the engine directly in D gear, and the car jerked violently, which startled me. Later, when I asked a technician, he said this would increase pressure on the internal components of the transmission, accelerating wear. So now, before parking, I always shift to P gear or turn off the engine, making it a habit. Occasionally doing it once or twice might not have an impact, but frequent occurrences can shorten the transmission's lifespan, and repairs can be shockingly expensive. For safety, always ensure the gear is in the correct position before starting to prevent accidents.

[VanLeo]

Car repairs can be costly, with major transmission overhauls often running into thousands. Stalling in D gear increases wear risk, accelerating part aging over time and leading to premature repair expenses. By paying attention to this—shifting to P or N before turning off the engine—I protect my vehicle and extend its lifespan. Regular transmission inspections also help prevent issues proactively.

[VonAlana]

I pay attention to operating procedures. Before turning off the engine, it is necessary to shift to P (Park) or N (Neutral) gear. This is how automatic transmissions are designed. When in D (Drive) gear, the gears remain in the driving state, and turning off the engine may interrupt the hydraulic pressure, increasing clutch friction. Recommended steps: After coming to a complete stop, shift gears before turning off the engine. It's safe and protects the car, avoiding repair troubles.