Possible causes of knocking noise when shifting gears in a Hyundai Solaris automatic transmission:
* Worn torque converter splines: This is the connection between the engine and automatic transmission that can wear out and cause a knocking noise when shifting gears.
* Damaged automatic transmission gears: Gears can wear out, chip or break, resulting in a knocking noise.
* Insufficient transmission fluid level: Low fluid levels can cause a loss of pressure in the automatic transmission, which leads to clutch slipping and knocking.
* Clogged or faulty shift solenoid: Solenoids control gear shifting and failure can result in rough or harsh shifting, causing a knocking noise.
* Worn automatic transmission bearings: Bearings can wear out over time, causing noise and vibration, especially when shifting gears.
* Damaged engine or transmission mount: Mounts are designed to absorb vibration, and damage to them can cause noise to be transmitted to the vehicle body.
* Faulty throttle position sensor: This sensor tells the automatic transmission about the position of the accelerator pedal, and its failure can lead to improper shifting and knocking.
What to do:
1. Check the transmission fluid level.
2. Take the vehicle to a qualified mechanic to diagnose and repair the problem.
3. Do not delay repairs, as continued driving with a faulty automatic transmission can lead to serious damage and costly repairs.