Possible reasons for the automatic transmission jolting when starting off:
1. Low transmission fluid level
* Insufficient fluid levels can lead to oil starvation and insufficient hydraulic pressure, causing gear slippage.
2. Contaminated transmission fluid
* Dirt, metal shavings and old oil can clog fluid control passages and cause shifting delays.
3. Worn or damaged friction discs
* Over time, friction discs wear out and can become damaged, making it difficult to shift smoothly.
4. Faulty control solenoid
* Solenoids control the flow of fluid in the transmission. A faulty solenoid can cause incorrect pressure, resulting in jerking or slipping.
5. Worn oil pump
* The oil pump is responsible for creating fluid pressure in the gearbox. A worn pump may not provide enough pressure to shift smoothly.
6. Faulty speed sensor
* The speed sensor provides information about the rotation speed of the transmission. A faulty sensor may produce inaccurate signals, affecting switching timing.
7. Problems with electrical wiring
* Faulty electrical connections or sensors can interrupt the normal operation of the transmission, causing jerking.
8. Worn engine or transmission mount
* Worn mounts can allow the engine or transmission to move excessively, causing vibrations.
9. Problems with the torque converter
* The torque converter is responsible for transmitting torque from the engine to the gearbox. A faulty torque converter can cause vibration or shock when starting off.
How to fix the problem:
* Check the transmission fluid level.
* Flush and replace the transmission fluid.
* Replace worn friction discs.
* Check and replace faulty control solenoids.
* Replace the worn oil pump.
* Check and replace faulty sensors such as the speed sensor.
* Fix wiring and sensor problems.
* Replace worn engine or transmission mounts.
* Repair or replace the faulty torque converter.
If you are experiencing transmission jerking, it is recommended that you take it to a qualified mechanic for diagnosis and repair.