Common causes of Ford Focus automatic transmission malfunction:
Mechanical faults:
* Wear of clutches and steel discs
* Damage to planetary gears
* Transmission fluid leaks
* Valve block clogged
* Torque converter malfunction
Electrical faults:
* Malfunctions of the electronic control unit (ECU)
* Solenoid malfunctions
*Wiring problems
Software glitches:
* ECU software errors
* Incorrect gear shift settings
External factors:
* Improper maintenance (delayed replacement of transmission fluid or low level)
*Transmission overheating (due to too much torque, heavy towing, or cooling system problems)
* Aggressive driving style
Specific causes of Ford Focus automatic transmission malfunction:
* Slipping in higher gears: Wear of the reverse clutch pack clutches
* Delay in shifting gears: Malfunction of solenoids or ECU
* Jerks and shocks when switching: Worn clutches, problems with the valve body or ECU
* Gear Shift Failure: Torque converter or valve body malfunction
* Transmission fluid leaks: Shaft seals, valve body gaskets or automatic transmission housings
* Humming or vibration: Faulty bearings or gears
*Transition to emergency mode: ECU malfunctions, electrical faults or serious mechanical damage