Possible reasons
* Worn friction linings: Over time, the friction linings in an automatic transmission wear out, which can lead to slipping and jerking when pulling away.
* Dirty or old transmission oil: Dirty oil can contaminate the automatic transmission’s solenoids and control valves, which can cause shifting problems and jerking.
* Malfunction of the valve body: The valve body is responsible for controlling the flow of fluid in the automatic transmission. A malfunction or contamination of the valve body can lead to gear shift errors and jerking.
* Malfunctioning Solenoids: Solenoids are used to control the flow of fluid to the various clutch packs. Faulty solenoids can cause shifting delays and jerking.
* Faulty Throttle Position Sensor (TPS): A faulty TPS can transmit inaccurate throttle position data to the ECM, which can lead to shifting and jerking problems.
* Faulty Speed Sensor: A faulty speed sensor can send inaccurate vehicle speed data to the ECM, which can affect shift timing and cause jerking.
* Clogged automatic transmission filter: A clogged automatic transmission filter can restrict fluid flow, which can cause the transmission to starve and jerk.
* Wear of rubber seals: As automatic transmissions age, the rubber seals wear down, which can lead to fluid leaks and shifting problems.
What to do
* Check the level and condition of the transmission oil: Make sure that the oil level is correct and that it is clean and does not have a burning smell.
* Change your transmission oil and filters: Regular transmission maintenance, including oil and filter changes, can help prevent problems and jerking.
* Diagnose faulty components: Use a diagnostic scanner to check for trouble codes and identify faulty components.
* Repair or replace faulty components: Replace worn friction linings, faulty valve body, solenoids or other faulty components.
* Clean the throttle body and throttle position sensor: A dirty throttle body or faulty TPS sensor can affect shifting and cause jerking.
* Check speed sensor: Replace the faulty speed sensor to provide accurate vehicle speed information to the ECM.