Possible reasons for the automatic transmission jerking in the Volkswagen Passat B5:
1. Worn or malfunctioning gearbox:
* Worn clutches and steel discs
* Faulty torque converter
* Solenoid jamming
2. Hydraulic system malfunctions:
*Low or contaminated transmission fluid
* Faulty oil pump
* Clogged transmission fluid cooler
3. Electrical problems:
* Faulty automatic transmission control module
* Faulty sensors (eg speed sensor, throttle position sensor)
* Faulty wiring
4. Mechanical problems:
* Worn or damaged drive shafts
* Faulty differential
* Clutch slip (in models with DSG)
5. Software glitches:
* Failures in automatic transmission software
6. Other reasons:
* Dirty injectors
* Ignition problems
*Engine faults
What to do:
1. Check the level and condition of the transmission fluid.
2. If the fluid is dirty or smells burnt, replace it and the filter.
3. Diagnose the automatic transmission using an error scanner.
4. Have the problem identified and repaired by a qualified mechanic.