Why is there a strange noise when shifting to P gear?

[EmmaFitz]

According to the structural design of automatic transmissions, this type of sound is considered normal. Below is relevant information about automatic transmissions: 1. Operating principle: The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, automatic transmissions consume 10% more fuel than manual transmissions. Whether manual or automatic, more gears typically mean better fuel efficiency. 2. Driving techniques: For manual transmission vehicles, it's recommended to upshift at higher RPMs. Engines are designed to operate optimally at higher rotations, with components like dynamic balance and rotational inertia parameters calibrated for high-RPM performance. Prolonged operation at non-optimal RPMs increases internal component stress and wear, often leading to vibration and knocking, ultimately affecting engine lifespan. Selecting 3000 RPM as the upshift point ensures post-shift operation around 2300 RPM, maintaining the engine within its healthiest operating range.

[Briella]

After studying automatic transmission vehicles for several years, I've found that abnormal noises when shifting into Park (P) are mostly caused by issues with the transmission's internal parking mechanism, such as wear on the parking pawl or locking pin. If you frequently park on slopes, gravity can cause gear teeth to clash forcefully during engagement, resulting in a clicking sound. Another possibility is a loose brake linkage rod causing unstable torque transmission. I've seen cases where owners dismissed it as minor, only to face costly repairs when shifting became difficult later. For quick self-checks: ensure the brake pedal is fully depressed before shifting to P to reduce noise; regularly inspect transmission fluid level and quality – a fluid change is inexpensive but prevents worsening noises. Safety first – address such issues promptly to avoid unexpected stalling during highway driving. If uncertain, scan for trouble codes with an OBD reader before deciding on dealership service.

[VonKennedy]

I'm a new driver, and my automatic transmission car always makes a clicking sound when shifted into P gear, which makes me quite nervous. A friend suggested it might be related to my parking habits—like shifting gears before the car is fully stopped on a slope, causing abnormal stress on the mechanism when the car slides, and the sound is like parts arguing. I tried operating more slowly on flat ground, and the noise reduced a bit. But when the issue recurs, I worry the transmission control unit might be damaged, leading to high repair costs. Now that I often drive with my child, safety is my top priority, so I immediately took the car to the maintenance shop to check the oil lines and sensors. The mechanic advised me to always engage the handbrake before shifting into gear to cushion the mechanical stress. Although this noise seems minor, ignoring it could lead to worse problems, like losing control while driving.

[MacLena]

Having worked in auto repair for many years, I've encountered numerous cases of abnormal noises when shifting to P gear. Most are caused by wear or sticking of the transmission parking pawl, especially common in older vehicles. Simple steps: first check if the gear linkage is loose, then inspect the transmission fluid level; dirty or low fluid can exacerbate friction sounds. I've helped several customers with this issue - early oil changes and maintenance can save major repair costs later. Drive smoothly as abrupt braking and gear shifting often cause noises. Repair shops will use multimeters to test circuits and check for short-circuit risks. Address the issue promptly to avoid more time-consuming and costly damage to core transmission components.