Possible reasons for the transmission jerking when switching from 1st to 2nd gear on an automatic transmission:
1. Low level or contamination of transmission fluid:
* Automatic transmission fluid provides lubrication and power transmission.
*Low or contaminated fluid levels may cause slipping and jerking.
2. Worn friction discs:
* Friction discs allow smooth gear changes.
* Worn or damaged discs can cause slipping and jerking.
3. Faulty torque converter:
* The torque converter transfers power from the engine to the transmission.
*A faulty torque converter can cause slippage and vibration.
4. Faulty Transmission Control Module (TCM):
* TCM controls the operation of the automatic transmission.
* A faulty TCM may send incorrect commands, causing the engine to jerk.
5. Dirty oil filter:
* The oil filter traps particles and debris in the transmission fluid.
* A dirty filter can restrict fluid flow, causing slipping and jerking.
6. Faulty shift solenoid:
* Shift solenoids activate various friction plate packs.
*A faulty solenoid can cause the transmission to shift incorrectly and cause jerking.
7. Electrical problems:
*Wiring problems, such as poor connections or faulty sensors, can interfere with the operation of the automatic transmission.
Solution:
1. Check the level and condition of the transmission fluid and replace the fluid if necessary.
2. Have a qualified mechanic diagnose and possibly replace worn friction discs, torque converter, TCM or solenoids.
3. Replace the dirty oil filter.
4. Diagnose and repair any electrical problems.
Warning: If you experience transmission jerking when shifting from 1st to 2nd gear, it is important to see a mechanic as soon as possible. Ignoring the problem can make the situation worse and lead to costly repairs.