Possible causes of a metallic click when shifting an automatic transmission:
1. Worn or damaged solenoids:
* Solenoids control the flow of transmission fluid inside the automatic transmission. Worn or damaged solenoids may make a metallic clicking noise when shifting gears.
2. Low or contaminated transmission fluid:
* Transmission fluid provides lubrication and cooling of the internal components of the automatic transmission. Low or contaminated fluid can cause increased wear and metallic clicking noises when shifting gears.
3. Worn friction discs:
* Friction discs are used in automatic transmissions for smooth gear shifting. Worn discs can slip and cause a metallic click.
4. Damaged gears:
* The gears inside the automatic transmission can become worn or damaged over time. This can result in a metallic click when shifting gears, especially when changing from park to drive or reverse to drive.
5. Worn or damaged thrust bearings:
* Thrust bearings support shafts and gears inside the automatic transmission. Worn or damaged bearings may make a metallic clicking noise when the transmission is loaded.
6. Problems with the torque converter:
* The torque converter connects the engine to the automatic transmission. Torque converter problems, such as a worn lock-up clutch, can cause a metallic click when shifting gears.
7. Shaft problems:
* The shafts inside the automatic transmission may wear out or become damaged. This may result in a metallic click when shifting gears.
Actions to be taken:
1. Check the level and condition of the transmission fluid.
2. Contact a car service center for professional diagnostics and repairs.
3. Avoid operating the vehicle if you hear a metallic click when changing gears.
4. Perform regular automatic transmission maintenance, including replacing the transmission fluid and filter.