Possible causes of sharp jolts when switching automatic transmission:
1. Low or contaminated transmission fluid (ATF):
* Insufficient or contaminated ATF can cause the clutch to slip, causing squealing.
* Check and replace ATF regularly according to manufacturer’s recommendations.
2. Faulty shift solenoids:
* Solenoids control gear shifting.
*A faulty solenoid can cause improper shifting, causing jerking.
3. Problems with the valve body:
* The valve body directs ATF to the clutch and solenoids.
* A clogged or faulty valve body can cause uneven pressure distribution, causing shock.
4. Worn or damaged clutches:
*Clutch clutches help transfer power between gears.
* Worn or damaged clutches can cause slippage, resulting in shock.
5. Malfunction of the electronic transmission control module (TCM):
* The TCM controls the operation of the automatic transmission.
*A faulty TCM may transmit incorrect signals, causing harsh shifts.
6. Torque converter slipping:
* The torque converter transmits torque from the engine to the gearbox.
* Torque converter slippage can result in sudden shifting shocks.
7. Worn oil pump:
* The oil pump provides ATF pressure.
* A worn out oil pump may not produce enough pressure, resulting in poor lubrication and jerking.
8. Problems with wiring or connectors:
* Breaks or poor connections in the wiring or connectors can lead to malfunctions of the automatic transmission, causing shocks.
9. Faulty speed sensor:
*Speed sensors provide the TCM with vehicle speed information.
* A faulty sensor may transmit incorrect data, resulting in incorrect switching.
10. Problems with the gear mechanism:
*Damaged or worn gears or bearings can cause shifting problems, resulting in shifting noise.