Common automatic transmission problems in Toyota Corolla
1. Gear slippage
* Manifests itself as a loss of power when changing gears or the vehicle’s inability to accelerate smoothly.
* Reasons: wear of clutches, contaminated or low level of transmission fluid.
2. Hard gear shifting
* Noticeable jolts or jerks during shifting, accompanied by extraneous noise.
* Reasons: problems with the valve body, contaminated transmission fluid or sensor failure.
3. Humming or howling when moving
* Extraneous sounds, similar to humming or howling, usually made when driving at certain speeds.
* Causes: Worn bearings, gears or differential.
4. Gear shift delay
* There is a noticeable delay when changing gears, especially when shifting from low to high.
* Reasons: problems with the automatic transmission control unit, faulty solenoid or clogged filter.
5. Transmission fluid leak
* May appear as fluid spots under the vehicle or on the dipstick.
* Causes: faulty gaskets or seals, damaged gearbox housing.
Specific automatic transmission problems for Toyota Corolla
Automatic transmission U341E (1993-1997)
* Premature wear of gear shift solenoids
* Problems with valve body
* Wear of friction clutches
Automatic transmission U140E (1998-2002)
* Gear slippage due to friction wear
* Faulty gear selector position sensor
* Malfunctions of the automatic transmission electronic control unit
Automatic transmission U241E (2003-2008)
* Gear shift delay
*Hard upshifts
* Increased fuel consumption due to problems with torque converter locking
Automatic transmission K311 (2009-2013)
* Problems with linear shift solenoid
* Faulty transmission temperature sensor
* Worn gear shift mechanism
Automatic transmission K313 (2014-present)
*Hard shifting at low temperatures
* Torque converter problems
* Malfunction of the automatic transmission electronic control unit
Recommendations for preventing problems with automatic transmission
* Regular replacement of transmission fluid and filter.
* Checking the transmission fluid level and maintaining it at the proper level.
* Avoiding harsh driving or towing heavy loads.
* Diagnosis of automatic transmission if any unusual symptoms occur.