Possible causes of strange sounds when switching automatic transmission:
1. Low transmission fluid level:
* Check the transmission fluid level using the dipstick.
*Add liquid if necessary.
2. Contaminated transmission fluid:
* The fluid may become contaminated due to wear on transmission parts.
* Fluid needs to be replaced.
3. Malfunction of solenoids:
* Solenoids control gear shifting.
*Faulty solenoids can cause strange noises.
4. Wear of friction discs:
* Friction discs are used to engage and disengage gears.
*Over time they wear out and may cause slipping or strange noises.
5. Valve unit malfunction:
* The valve body controls the fluid flow in the gearbox.
*A faulty valve body can cause shifting problems and strange noises.
6. Malfunction of the selector position sensor:
* This sensor tells the transmission what position the gear selector is in.
*A faulty sensor may result in incorrect gear shifting and strange sounds.
7. Pump fault:
* The pump provides fluid pressure in the gearbox.
*A faulty pump can lead to insufficient pressure and shifting problems.
8. Wear of engine/gearbox mounts:
* Worn mounts may allow the engine or transmission to move during gear changes, which can cause strange noises.
What to do:
1. Check the level and condition of the transmission fluid.
2. If the fluid is old or dirty, replace it.
3. Contact a qualified mechanic to diagnose and repair the root cause of the strange noises.
4. Ignoring these sounds can lead to further problems and costly repairs.