What Causes the Abnormal Noise When Shifting to P Gear Before the Vehicle Comes to a Complete Stop?

[DeColeman]

There are several reasons for the abnormal noise when shifting to P gear before the vehicle comes to a complete stop: 1. Shifting gear before the vehicle stops completely: When parking, the vehicle should first come to a complete stop before shifting the gear lever from D gear to P gear. If the vehicle is shifted to P gear before stopping completely, the P gear lock hook inside the transmission will hit the gear, producing a clunking sound. This operation can cause wear or even breakage of the lock hook, and in severe cases, it may lead to transmission failure. 2. Incorrect operation sequence when parking on a slope: For automatic transmission models, the P gear relies on the lock hook to engage the gear and keep the vehicle stationary. When parking on a slope, the handbrake should be engaged first before shifting to P gear, allowing the handbrake to bear the vehicle's sliding force. If P gear is engaged before the handbrake, the sliding force of the vehicle will be entirely borne by the P gear lock hook, causing tension between the lock hook and the gear. In this case, shifting from P gear to other gears will produce a noise. 3. Malfunction in the gearshift mechanism: Many automatic transmission models with gear levers actually rely on mechanical structures for gear shifting. Over time or due to corrosion, the connecting parts of the gearshift mechanism can become loose or stuck, resulting in noise when shifting gears. 4. Wear and tear of transmission gears: The transmission is a precision component, and the gears are the most indicative of this. The meshing of transmission gears is extremely tight, leaving no room for any gaps. However, because of this tight meshing, wear and tear are inevitable. Over time, larger gaps will form between the gear teeth, causing noise when shifting gears.

[MacCali]

I've encountered this situation before too, where I hastily shifted into P gear before the car had completely stopped, resulting in a series of clicking noises. This mainly happens because engaging P gear while the vehicle is still moving forces the parking lock mechanism to forcibly engage with the transmission gears, causing a hard metal-on-metal impact and noise. Repeatedly operating the vehicle this way can accelerate wear on the parking pawl and gears, and even damage internal transmission components, potentially leading to increased repair costs. I recommend developing the habit of firmly pressing the brake when parking, waiting until the vehicle speed drops to zero before shifting into P gear. This approach is both quieter and better for the vehicle. Additionally, it's important to regularly check the condition of the transmission fluid. If abnormal noises occur frequently, it's best to have a professional shop conduct a comprehensive inspection to prevent minor issues from turning into major problems. Safety comes first, so it's better to be patient with your operations.

[Wilson]

When I first learned to drive, I made this mistake: I shifted into P while the car was still moving slightly, and instantly heard a loud clunking noise. The reason is that the parking mechanism in P isn't designed to handle dynamic situations—it relies on a locking pawl to secure the transmission gear. If the car has momentum, the pawl forcibly engages the gear teeth, causing rebound vibrations and strange noises. This habit isn't just noisy; over time, it can shorten the transmission's lifespan, potentially leading to costly repairs. I've since learned to slow to a complete stop before shifting. I recommend beginners practice brake pedal feel and use the auto-hold function for added safety and convenience. Also, if your vehicle has different driving modes, try Eco mode to reduce sudden stops and prevent similar issues. Regular maintenance checks on the drivetrain are essential.

[Everly]

When shifting to P gear before the car comes to a complete stop, abnormal noises mainly originate from the forced engagement of the parking mechanism under dynamic conditions. The P gear locking assembly includes a pawl and gear, and engaging them while moving causes impact noise. This is not only annoying but also places excessive stress on the drivetrain, increasing the risk of mechanical failure. I emphasize safe driving by ensuring the vehicle is at zero speed before operating. It is recommended to develop stable parking habits, such as firmly pressing the brake before shifting gears. Long-term neglect of abnormal noises may lead to transmission damage, affecting driving safety. Pay attention to checking tire and brake conditions to reduce the need for sudden stops.