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

[MacBrantley]

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.

[DeNicole]

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.

[GrantMarie]

When an automatic transmission car doesn't move in D gear, it's mostly a transmission issue. Start by checking the simplest things: open the hood and inspect the transmission dipstick. Low fluid level or darkened color may cause the problem. Additionally, if electronic modules like the gear position sensor are damaged, the gear shift signal will be interrupted, leaving the car stationary. If the brake system is stuck and doesn't release, it can also hold back the wheels. Having driven various cars, I've found that timely response is crucial: try restarting after coming to a complete stop. If there's no improvement, seek professional help to scan for trouble codes as soon as possible. For regular maintenance, it's recommended to change the transmission fluid every two years, which can significantly reduce such risks and give you more peace of mind while driving. Don't ignore small warning lights, or the repair costs could become much higher if left unattended. Safe driving depends on daily attention to details.

[VonRyder]

Why doesn't the car move when in D gear? It could be due to insufficient or dirty transmission fluid, causing inadequate lubrication and preventing gear shifts. Another possibility is an electronic component failure, such as a malfunctioning gear control module where signals aren't transmitted. Simply check the dipstick first. If the fluid level is normal but the car still doesn't move, take it to a repair shop. Don't panic in such situations, stay calm.