What causes the noise when shifting to P gear?

[LeIsabela]

The reasons for noise when shifting to P gear are transmission output shaft gear failure and the handbrake not being tightened properly. Transmission output shaft gear causes: According to the structural design of automatic transmissions, this type of sound is actually normal. The P gear is designed as the parking gear, operating on the principle of a brake pawl engaging with a ring gear. As long as the ring gear is engaged, it remains in constant motion while the pawl is fixed. This interaction between motion and fixation naturally produces noise. This P gear locking mechanism results from the coordinated operation between the gear on the transmission's internal output shaft and the locking pin, which is why vehicles cannot move forward or backward when in P gear. The steeper the slope, the greater the force required. Handbrake not tightened properly: For this situation, it's recommended to first bring the vehicle to a complete stop, engage the manual brake (handbrake), and then shift to P gear for better results. Additionally, it's advisable to check the performance of the engine mount. If its performance has degraded, it may cause the aforementioned phenomenon.