What is the reason for the abnormal noise when shifting from P to R gear?

[BeckettLee]

p>The abnormal noise when shifting from P to R gear is because the P gear has a locking mechanism. After engaging the P gear, the transmission gear is locked, and the car cannot move without pulling the handbrake. When shifting from P gear to other gears, the locking mechanism will release the lock, and it is normal to hear abnormal noise at this time. The following is a related introduction to gear shifting: 1. Concept: Gear shifting is the abbreviation of "gear lever operation method". It refers to the process in which the driver continuously changes the position of the gear lever according to the road conditions and the speed of the car through various psychological and physiological movements. Generally, the "gear lever operation method" is limited to the "gear lever" itself. 2. Technical requirements: The technical requirements for gear shifting can be summarized into eight words: timely, correct, smooth, and fast. Timely: grasp the appropriate gear shifting time, that is, neither shift up too early nor shift down too late. Correct: The coordination of the clutch pedal, accelerator pedal, and gear lever should be correct and coordinated, and the position should be accurate. Smooth: After shifting into a new gear, the clutch pedal should be timely and smooth. Fast: The action should be fast to shorten the gear shifting time, reduce the loss of car kinetic energy, and reduce fuel consumption.

[DiClaire]

I've been driving for over ten years and encountered abnormal noises when shifting from P to R gear. This is usually caused by the gear shift mechanism in the transmission getting stuck or worn out, especially more noticeable during cold starts. The reason might be insufficient or deteriorated transmission fluid, leading to inadequate lubrication and rough gear engagement. Last time my car had this issue, the inspection revealed the fluid had turned black, and the noise disappeared after replacing it. Long-term neglect could result in complete part failure, causing shifting difficulties or even total transmission failure, with repair costs skyrocketing. It's advisable to pay attention to regular maintenance, changing the transmission fluid every 2 years or 50,000 kilometers to prevent minor issues from escalating. If the abnormal noise persists, avoid DIY disassembly and seek a professional shop for a comprehensive diagnosis promptly to avoid misjudgment and ensure driving safety.

[DiCorey]

Common causes of gear shifting noise are often related to internal transmission issues, such as excessive gear clearance or hydraulic system failure. In automatic transmission vehicles, gear shifts are driven by hydraulic pressure, and a clicking sound may occur when there's insufficient fluid or excessive impurities. A simple self-check method is to start the engine, press the brake pedal firmly for a few seconds before shifting, which may sometimes alleviate the issue. Also, check the transmission fluid level by opening the cap and using the dipstick; top it up if it's low. However, inexperienced individuals should avoid tampering with electrical circuits to prevent short circuits. Develop a habit of regular inspections, and ask the technician to check the fluid quality during each maintenance service. If the noise is accompanied by vibrations, it might indicate bearing damage, which requires immediate repair to prevent potential loss of control and accidents while driving—definitely not worth the risk. For minor issues, I recommend DIY fluid checks, but for severe cases, seek professional repair immediately.

[DelMargaret]

A loud noise when shifting from P to R gear is mostly caused by worn transmission gears or a loose gear shift lever. I prioritize driving safety, so I stop immediately upon hearing any abnormal noise, as it may indicate an impending transmission failure, such as gear breakage leading to jamming, which is very dangerous at high speeds. Possible causes include low oil pressure or aging parts, so don't delay repairs. Go directly to a 4S shop for computer diagnostics to locate the fault. Always shift gears gently to avoid rough handling and prolong part lifespan. Safety comes first; spending a little on repairs ensures greater protection.

[JulianFitz]

The source of abnormal noises often stems from insufficient lubrication in the transmission or internal clearance issues. Through regular vehicle maintenance, I've found that P to R shifting abnormalities are usually caused by deteriorated oil or component wear, such as needing replacement parts after exceeding 80,000 kilometers. Checking oil level and color during each service to ensure cleanliness and freshness can prevent 90% of problems. Neglecting this may lead to rough shifting and an uncomfortable driving experience. Cultivate the habit of shifting gently, especially allowing a one-to-two-minute warm-up during cold starts before operation. Don't skimp on maintenance costs—regular inspections save time and effort.