What are the reasons why a car cannot engage reverse gear?

[OAlejandro]

Here are the reasons why a car cannot engage reverse gear: Clutch not fully depressed: For manual transmission cars, the clutch pedal must be fully depressed to shift gears. Simply pressing the clutch pedal deeper can resolve this issue. Gear teeth alignment: Many cars do not have synchronizers installed for the reverse gear. When attempting to engage reverse, the teeth of two gears might be perfectly aligned, causing the gear to get stuck and preventing engagement. In this case, simply shift into a forward gear first and then try engaging reverse again. During gear shifting, transitioning from a higher gear to a lower gear can easily cause impact between gear teeth or spline teeth, and the synchronizer's role is to prevent such impacts. Transmission malfunction: If there is an issue with the car's transmission, it is recommended to visit a 4S shop for repair. The required repair costs might be relatively high, and the repair time could be lengthy.

[BrielleFitz]

I often encounter the issue of not being able to engage reverse gear when driving a manual transmission car, mainly due to improper clutch disengagement. In a manual transmission car, if you feel the clutch pedal travel is too long or there's a slipping sensation when pressing the clutch, it might be due to worn clutch plates or a deformed pressure plate, resulting in incomplete power transfer and making reverse gear engagement feel rough. Another common cause is poor transmission fluid quality; if the oil is black or has sediment, it can hinder the gearshift mechanism, especially in older cars. I found that changing the fluid helped a lot. Additionally, loose shift cables or linkage can cause misalignment, and forcing it might damage the gears. For safety, it's best to stop and get it checked rather than risking an accident while reversing.