Possible reasons:
Transmission problems:
*Too little or too much transmission fluid
* Worn or damaged clutches
* Faulty torque converter
* Damage or leaks in the mechanical part of the transmission
Electronic problems:
* Faulty engine speed sensor
* Faulty gear selector position sensor
* Malfunctions in the electronic transmission control module (TCM)
*Wiring problems
Engine faults:
* Air leak in intake system
* Faulty spark plugs or ignition coils
* Problems with the power system
Other reasons:
* Dirty or clogged oil filter
* Incorrect fuel pressure
*Low battery voltage
*Old or degraded transmission fluid
Diagnostics:
1. Check transmission fluid level: Follow the instructions in your vehicle’s owner’s manual to check the correct fluid level. If necessary, add or replace fluid.
2. Carry out computer diagnostics: Connect the OBD2 scanner to the car and read the fault codes. This may provide clues about a faulty component.
3. Check the transmission fluid pressure: To do this, you will need a pressure gauge and a detailed vehicle maintenance manual.
4. Check engine performance: Connect a scanner and check for engine fault codes. Inspect the intake system for leaks or cracks.
Solution:
The solution to the problem will depend on the identified cause. Here are some common solutions:
* Replacement of transmission fluid and filter
* Replacement of worn or damaged transmission parts
* TCM reprogramming or replacement
* Repair or replacement of faulty sensors
* Elimination of air leaks in the intake system
* Replacement of faulty spark plugs or ignition coils
* Maintenance or replacement of the power system
* Troubleshoot wiring problems
* Replacing a faulty battery