Mechanical faults:
* Clutch wear: Transmission slipping, inability to shift gears
* Gear damage: Grinding, humming, difficult gear shifting
* Differential failure: Noise when turning, difficult movement
*Transmission fluid leak: Puddles of transmission fluid under the car, decreased fluid level
* Shaft damage: Vibration, difficult gear shifting
Electrical faults:
* Solenoid failure: Unable to shift gears, stuck in one gear
* Malfunction of speed sensors: Incorrect indication of gear ratio, difficult gear shifting
* Transmission Control Module (TCM) malfunction: Computer errors, transmission malfunctions
* Electrical wiring malfunction: Short circuits, breaks, worn wires
Hydraulic faults:
*Low transmission fluid pressure: Difficulty shifting, slipping
* Clogged hydraulic filter: Insufficient fluid pressure, gear shifting problems
* Torque converter malfunction: Slippage during acceleration, noise when driving
* Transmission fluid leaks: Reduced fluid level, problems with transmission operation
Other faults:
* Damage to the gearbox housing: Fluid leakage, noise while driving
* Worn brake band: Inability to downshift
* Contamination of transmission fluid: Deterioration of smooth gear shifting, accelerated wear of components
* Incorrect transmission fluid level: Transmission malfunction, damage