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What is the reason for a loud noise when shifting from P to R gear in a new car?

2 Answers

StJanelle

07/29/25 7:40am

New cars make a loud noise when shifting from P to R gear because: the P gear has a locking mechanism. After engaging the P gear, the transmission gears are locked, preventing the car from moving even without the handbrake. When shifting from P to other gears, the locking mechanism releases, and it is normal to hear noise at this time. The P gear is a special neutral position that mechanically locks the transmission output shaft to secure the vehicle. Its function is to act as a parking brake, preventing the vehicle from moving. The R gear is the reverse gear. When the gear lever is in this position, the hydraulic system connects the reverse gear circuit, causing the drive wheels to reverse and enabling reverse driving.

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DeGianna

08/12/25 10:57am

The brand-new car I just bought also makes a clicking sound when shifting into reverse gear. This is mainly caused by the impact noise generated during the gear meshing process when the automatic transmission switches from parking gear to reverse gear. Since the car is new and still in the break-in period, insufficient lubrication of some transmission fluid may cause this. Sometimes, incomplete brake engagement or uneven ground can amplify the sound, causing excessive vibration in the control linkage. It is recommended to immediately have a 4S店 technician check the transmission fluid level and shift mechanism; if ignored, gear wear will worsen, and over time, the transmission may require major repairs. The car is still under warranty, making the process free and worry-free, so don’t delay until the problem worsens and regret it later.

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