Common malfunctions of the Toyota Corolla automatic transmission:
1. Transmission slipping or slipping:
* Occurs when gears slip or do not engage properly.
*Symptoms: Slow shifting, increased engine speed, or a feeling of slipping.
* Causes: worn friction discs, low transmission fluid level, faulty solenoids.
2. Difficulty shifting gears:
* Gears are difficult to change from park or impossible to change to another gear.
*Symptoms: Delay or failure when shifting gears.
* Causes: faulty gear selector, stuck switch, faulty solenoid.
3. Shocks or jolts when shifting gears:
* Sharp jolts or impacts when changing gears.
* Signs: Vibration or shaking felt in the vehicle interior.
* Causes: worn or damaged friction discs, faulty torque converter, low transmission fluid level.
4. Hum or howl in the gearbox:
*An unusual hum or whine coming from the transmission.
* Symptoms: Noise that increases with speed or load.
* Causes: worn gears, low transmission fluid level, faulty bearing.
5. Transmission fluid leak:
* Red or brown fluid leaking from the transmission.
* Signs: puddles under the car, low fluid level on the dipstick.
* Causes: damaged gaskets, worn seals, loose connections.
6. Transmission overheating:
* The gearbox overheats and fails.
* Signs: Check Engine light flashing, burning smell, difficulty shifting gears.
*Causes: low transmission fluid level, clogged transmission cooler, faulty temperature sensor.
Other faults:
* Faulty speed sensor
* Worn torque converter
* Faulty transmission control unit