Possible reasons:
Transmission fluid level is low: Make sure the transmission fluid level is between the ‘MIN’ and ‘MAX’ marks on the dipstick. Low levels can cause clutch slippage and squealing.
Contaminated transmission fluid: The fluid should be changed at the interval recommended by the manufacturer. Contaminated fluid can cause increased wear and friction, resulting in jerking.
Faulty solenoids: Automatic transmission solenoids control the flow of transmission fluid to the various clutches. A faulty solenoid can cause rough shifting and jerking.
Worn clutches: The clutches in automatic transmissions wear out over time, leading to clutch slippage and squealing.
Dirty Transmission Filter: A clogged filter can restrict transmission fluid flow, resulting in rough shifting and jerking.
Faulty input/output shaft speed sensor: These sensors provide information to the transmission control module about the speed of the shafts. Faulty sensors can result in incorrect gear shift settings.
Faulty Transmission Control Module (TCM): The TCM monitors the operation of the automatic transmission. A faulty TCM can cause irregular gear shifts and jerking.
How to troubleshoot:
* Check the transmission fluid level.
* Replace transmission fluid and filter if necessary.
* Scan the automatic transmission for trouble codes that may indicate faulty solenoids or sensors.
* Check the condition of the clutches and replace them if necessary.
* Clean the dirty automatic transmission filter.
* Replace the faulty input/output shaft speed sensor.
* If the TCM is faulty, please contact an authorized service center for repair or replacement.
If you cannot determine the cause yourself, it is recommended that you contact a qualified mechanic for diagnosis and repair.