Possible causes of shocks when shifting gears on an automatic transmission:
1. Low or contaminated transmission fluid:
*Low fluid levels can cause insufficient lubrication and friction resulting in jerking.
* Contaminated fluid may contain particles that block oil flow and cause slippage.
2. Faulty shift solenoid:
* Solenoids control the engagement and disengagement of individual gears.
*A faulty solenoid can cause delayed or improper shifting, causing jerking.
3. Worn friction discs:
* Friction discs transfer power from the engine to the transmission.
* Worn or damaged friction discs can cause slippage and shock.
4. Faulty valve body:
* The valve body directs transmission fluid to the required components.
* A faulty valve body can cause improper fluid pressure, resulting in jerking.
5. Clogged or dirty transmission filter:
* A clogged filter restricts transmission fluid flow, causing component starvation and jerking.
6. Faulty speed sensor:
* The speed sensor provides information about the rotation speed of the input and output shafts.
* A faulty sensor may send incorrect signals, causing improper shifting and jerking.
7. Worn driveshafts:
* Driveshafts transfer power from the transmission to the differential.
* Worn or misaligned driveshafts can cause vibration and shock.
8. Faulty torque converter:
* The torque converter connects the engine to the transmission.
* A faulty torque converter can cause vibration and shock when shifting gears.
9. Faulty Transmission Control Unit (TCU):
* The TCU controls the operation of the automatic transmission.
*A faulty TCU can cause improper shifting and jerking.