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What Causes an Automatic Transmission Car to Not Move When Shifted to D Gear?

2 Answers

MacBrantley

07/24/25 1:28am

Here are the specific reasons why an automatic transmission car does not move after shifting to D gear: 1. Check if the transmission fluid level is too low, whether the main oil pressure and gear oil pressure are normal, and then verify if the gear switch signal is normal, if the wiring from the transmission computer to the shift solenoid valve is intact, and if the gear solenoid valve is functioning properly. 2. If none of the above issues are found, it indicates a problem with the internal control system of the transmission, requiring disassembly of the transmission to inspect the internal components. Below is additional information about automatic transmission gears: (1) The R gear is the reverse gear. When engaged, it connects the hydraulic system to the reverse gear circuit, causing the drive wheels to turn in reverse for backing up. Do not forcibly shift to "R" gear when the vehicle is not completely stopped, as this can damage the transmission. (2) The N gear is the neutral gear. When in neutral, the planetary gear system idles without transmitting power. (3) The D gear is the drive gear. When the shift lever is in this position, the hydraulic control system automatically engages the appropriate forward gear circuit based on throttle opening and vehicle speed signals, shifting gears automatically as speed changes to achieve automatic transmission functionality. (4) The P gear is the parking gear. It uses a mechanical device to lock the rotating parts of the car's tires, preventing the vehicle from moving.

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DeNicole

08/10/25 9:07pm

A few days ago, I also encountered a situation where my automatic transmission car wouldn't move when shifted to D gear, which really gave me a scare. Common causes include insufficient or dirty transmission fluid, leading to poor hydraulic system performance. If the fluid is aged and turns black, the shifting resistance increases, and the car simply won't move. There can also be issues with the electronic control system, such as sensor failure, where the gear signal fails to reach the transmission module, causing the car to get stuck in D gear without delivering power. Additionally, insufficient engine power or brake drag might prevent the car from moving. In my case, it turned out the fluid level was low, and adding new fluid fixed the problem. If you encounter this situation, don't panic. First, pull over safely, turn on your hazard lights, and check the dipstick for fluid level. If it's below the minimum mark or the fluid appears cloudy, head to a repair shop immediately. Ignoring it could cause severe transmission damage, leading to more expensive repairs. Regular fluid changes and inspections are key to prevention.

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