Possible causes of kicking when switching from 1st to 2nd gear in an automatic transmission:
Mechanical problems:
* Worn friction discs or clutch band
* Malfunction of the hydraulic valve block (solenoids)
* Contaminated or low transmission fluid level
* Automatic transmission pump malfunction
Electrical problems:
* Faulty input speed sensor
* Faulty output speed sensor
* Malfunction of the automatic transmission electronic control unit (ECU)
Other reasons:
* Incorrectly adjusted throttle control cable
*Faulty throttle position sensor
* Clogged automatic transmission oil filter
Possible solutions:
* Replacement of worn parts such as friction discs or clutch band
* Repair or replacement of valve body
* Checking and replacing transmission fluid
* Diagnostics and repair of a faulty automatic transmission pump
* Replacement of faulty sensors or ECUs
* Throttle cable adjustment
* Replacing a faulty throttle position sensor
* Cleaning the automatic transmission oil filter
Additionally:
* Regular automatic transmission maintenance, including changing the transmission fluid and filter, can prevent shifting kicks.
* Avoid sudden acceleration and braking as this may place excessive stress on the automatic transmission.
*If the kicking does not stop after trying the solutions listed above, it is recommended that you seek professional help from a qualified mechanic.