Possible causes of jerking when switching automatic transmission on Tiguan:
1. Low transmission fluid level:
* Fluid leakage due to damaged hoses, gaskets or seals.
* Evaporation or oxidation of liquid over time.
2. Contaminated or old transmission fluid:
* Contaminants such as metal shavings can clog the solenoids and cause shifting problems.
*Old fluid may lose its lubricating and hydraulic properties.
3. Faulty solenoids:
* Solenoids control gear shifting by controlling fluid flow.
*Faulty solenoids can cause slow or harsh gear changes.
4. Faulty Transmission Control Module (TCM):
* The TCM controls all automatic transmission functions, including gear changes.
* A faulty TCM may send incorrect commands or not process incoming signals properly.
5. Automatic transmission filters with clogging:
* Clogged filters can restrict fluid flow, leading to shifting problems.
6. Mechanical problems:
* Worn or damaged friction discs
* Faulty automatic transmission pump
* Damage to gears
*Wiring problems
7. Software errors:
* Errors in automatic transmission software may affect gear shift control.
8. Transmission wear:
*As the transmission ages and wears, shifting problems may occur.
Diagnostics and repair:
* Check the transmission fluid level and replace the fluid and filter if necessary.
* Scan the vehicle for trouble codes indicating problems with the automatic transmission.
* Check the automatic transmission solenoids for signs of malfunction.
* Inspect electrical wiring for damage or corrosion.
* If necessary, contact a qualified mechanic for further diagnosis and repair.