Possible reasons for the Nissan automatic transmission jerking when shifting:
1. Low Transmission Fluid (ATF): Low ATF levels can lead to insufficient lubrication and pressure, which causes jerking when shifting gears.
2. Dirty or old ATF: Dirty or old ATF can lose its lubricating and frictional properties, causing slipping and jerking.
3. Worn or damaged automatic transmission components: Worn or damaged automatic transmission solenoids, friction plates, or other internal components can cause rough operation and jerking when shifting gears.
4. Wiring Problems: Electrical problems, such as faulty sensors or wiring, can interfere with the transmission and cause it to jerk.
5. Problems with the engine control unit (ECU): The ECU is responsible for controlling the operation of the engine and automatic transmission. ECU malfunctions can disrupt the transmission of signals to the automatic transmission, which leads to jerking.
6. Clogged automatic transmission oil filter: A clogged oil filter can restrict ATF flow and cause insufficient pressure, resulting in jerking.
7. Worn rubber engine and transmission mounts: Worn mounts can allow the engine and transmission to move too much, resulting in a jerky feeling when shifting gears.
8. Differential Problems: Problems with the differential, which is responsible for distributing power to the wheels, can cause vibration or jerking when shifting gears.
Recommendations:
* Check ATF level and condition.
* Replace transmission fluid and filter.
* Have any faulty automatic transmission components diagnosed by a qualified mechanic.
* Check and repair any wiring or ECU problems.
* Replace worn or damaged engine or transmission mounts.
* Check and repair differential if necessary.