Possible problems when turning on the automatic transmission:
1. The starter does not turn:
* Battery is discharged or faulty
* Faulty starter
* Poor contacts at the battery or starter terminals
2. The engine starts, but the gearbox does not engage:
*Low level or poor quality transmission fluid
* Faulty shift solenoid
* Worn or damaged friction discs
* Faulty transmission control unit
3. The gearbox switches on with a delay:
*Faulty throttle position sensor
* Faulty speed sensor
* Slipping in the torque converter
4. The gearbox starts with shocks or vibrations:
* Faulty torque converter
* Worn engine or transmission mounts
*Low transmission fluid level
5. Transmission does not shift to higher gears:
* Faulty pressure regulator
* Clogged transmission fluid filter
* Faulty transmission fluid temperature sensor
6. The transmission does not shift to lower gears:
* Faulty vacuum modulator (vacuum controlled models only)
* Faulty electronic control module (electronic controlled models only)
7. Transferring the gearbox to neutral while driving:
* Faulty shift position sensor
* Faulty torque converter lock-up solenoid
8. Transmission fluid leak:
* Damaged pan gasket
* Faulty transmission seal
* Damaged transmission fluid line
9. Strange noises when turning on the gearbox:
* Worn or damaged bearings
*Low transmission fluid level
* Faulty torque converter