Possible causes of knocking when engaging reverse gear in a Hyundai Solaris automatic transmission:
*Friction Disc Wear: Over time, the friction discs in the transmission wear out, which can cause slipping and clunking noises when the transmission is engaged.
* Torque Converter Malfunction: The torque converter transmits power from the engine to the transmission. Its malfunction may cause a knocking noise when shifting gears.
* Problems with the gear shift mechanism: The gear shift mechanism is responsible for selecting and engaging gears. If it malfunctions, it may cause a grinding sound or knocking noise.
* Lack of transmission fluid: Insufficient fluid level in the automatic transmission can lead to increased friction and knocking when shifting gears.
* Contaminated transmission fluid: Contaminated transmission fluid may contain particles that interfere with the smooth operation of the transmission and cause knocking.
* Worn transmission bearings: Damaged or worn bearings may make a knocking noise when shifting gears.
*Faulty Speed Sensor: A faulty speed sensor can send incorrect information to the transmission control module, resulting in improper shifting and knocking.
Recommended actions:
* Check the level and condition of the transmission fluid. Replace fluid and filter if necessary.
* Take the car for diagnostics to a car service that specializes in transmission repair.
*Do not ignore the knocking noise as it may cause serious damage to the transmission.