What is the reason why the car cannot move forward or backward after starting?

[VanLillian]

When a car cannot move forward or backward after starting, it is usually due to a malfunction in the transmission or drivetrain system. In such a situation, it is advisable to immediately visit a 4S shop to check the fault codes. The transmission is a crucial component of the drivetrain system, as it enables gear shifting and torque conversion, allowing the power output from the car's engine to meet the demands of various driving conditions. More details about the transmission are as follows: 1. It is divided into manual transmissions and automatic transmissions: There are two types of transmissions in cars, one is the manual transmission, and the other is the automatic transmission. 2. Classification of automatic transmissions: There are three common types of automatic transmissions in cars: AT transmissions, CVT transmissions, and dual-clutch transmissions. (1) The AT transmission is the most mature and widely used automatic transmission. It contains numerous planetary gears inside, which are responsible for gear shifting and torque conversion. The AT transmission is connected to the engine via a torque converter. (2) The CVT transmission is a relatively simple automatic transmission in structure, consisting of only two pulleys and a steel belt. (3) The dual-clutch transmission is a product developed based on the manual transmission, with the addition of an extra clutch and a gear-shift control mechanism. One clutch in the dual-clutch transmission controls the odd-numbered gears, while the other controls the even-numbered gears. The dual-clutch transmission offers fast gear shifting and relatively high transmission efficiency.

[LaKate]

This is a question I often get asked too—it can be really frustrating when a car starts but won't move. The most common cause is the handbrake not being fully released, especially if an electronic handbrake is stuck and locks the wheels. For automatic cars, not shifting into D or R and getting stuck in P or N is also quite common. In manual transmissions, clutch slippage or wear is often the culprit, where the engine revs up when you press the gas but the wheels don't move. Another issue could be brake system jamming, like rusted brake pads, which is common during the rainy season. I recommend first checking if the handbrake is released and then testing whether gear shifting is smooth. Regular maintenance, including brake and transmission fluid checks, can help prevent such issues. Safety comes first—if this happens, pull over and avoid forcing the car to move.

[KennedyRose]

As someone who uses a car daily, I know how frustrating it can be when the car won't move. Whether the handbrake is released is key; for cars with electronic parking brakes, try restarting the system. Gear issues are common in automatic transmissions, often caused by the shift lever not being properly engaged or sensor faults leading to gear jams. Tires getting stuck in snow, ice, or mud is also frequent—try turning the steering wheel to check resistance. Worn clutches or insufficient oil pressure can affect power transmission. Electrical issues, like blown fuses, might also disrupt control. Don't panic—first ensure safety by turning off the engine and restarting to observe. Developing the habit of releasing all brakes when parking can save a lot of trouble.

[LeAdeline]

I've seen many similar cases in repair shops. Most of them are transmission failures, including valve body blockage or low oil level causing gear engagement issues. Brake calipers seizing and preventing wheel rotation is very dangerous, especially after frequent braking on mountain roads. Aging clutch components or poor disengagement affect power transmission. It's recommended to check gear lever feedback and listen for abnormal sounds to diagnose. If you're not familiar with mechanics, directly ask a professional technician to scan for error codes with a diagnostic tool. Regular transmission oil changes can prevent gear sticking issues.

[AdamRose]

Don't panic if your car won't move. Common causes include the handbrake not being released or electronic system failure. An improperly engaged gear is often overlooked—try shifting the lever a few more times. Brakes may freeze or stick, especially in winter. Clutch issues like a warped pressure plate can prevent movement. For safety, first turn on hazard lights and pull over; avoid forcing the car to prevent accidents. Regular maintenance should focus on the drivetrain and brakes, with anti-rust additives to reduce seizure risks. Simple self-checks can resolve half the problems.

[HarleyLee]

As a car enthusiast, there are various reasons why a vehicle may fail to move forward or backward. The primary culprits are incorrect gear engagement or internal damage to the transmission, such as worn synchronizers. Brake system lock-up is another common issue, especially in modified cars where electronic module failures frequently occur. Clutch slippage or fuel line blockages can also interrupt power transmission. Sharing from experience: after a rain, my car's front wheels locked up, and I discovered it was due to rusted handbrake linkages. Minor issues can be handled independently, but mechanical problems should be addressed by professionals. Regular lubrication of key components can extend their lifespan.