Most Common Failures
Torque Converter Issues
A common sign of torque converter malfunction is vehicle vibration, especially noticeable during acceleration at speeds between 80–100 km/h. The vibration usually disappears once acceleration continues.
Poor Transmission Maintenance
Maintaining the correct oil level helps prevent breakdowns. If the ATF fluid (specific to automatic gear changes) is too low, the oil pump will draw in air along with fluid, creating bubbles in the hydraulic circuit.
Using the wrong transmission oil can lead to poor gear shifting and serious, expensive transmission damage
Faulty Electronic Controls
Any sensor error or failure in the electro-hydraulic module that manages valve actuation can cause the transmission to enter so-called "limp mode."
Solenoid Valve Malfunctions
Common symptoms of solenoid valve failure include limp mode activation with error codes related to the solenoids and harsh shifting or jolts. This typically happens when the valve is supposed to be off but still engages.
Drum Failure
Gear changes become harsh or may fail entirely. You may also see increased fluid pressure, which triggers limp mode.
Oil Pump Failure
If the oil pump fails and doesn't provide enough lubrication, there will be no hydraulic pressure in the gearbox, and the transmission will malfunction.
Types of Automatic Transmissions and Their Maintenance
Automated Manual Transmission (AMT)
Since it's essentially a manual gearbox with robotic controls, it doesn't require more care than a manual.
If no manufacturer interval is given, replace the oil every 200,000 km.
Clutch wear is normal over time and costs about the same as for a manual.
Hydrodynamic Torque Converter Transmission
Traditional automatics are known for long life if the oil is changed regularly.
Recommended oil change interval: 60,000 km or every 4 years, whichever comes first.
If the manufacturer claims "lifetime" oil, note that they often mean the warranty period — neglecting oil changes may destroy the transmission.
Dual-Clutch Transmission (DCT)
Generally reliable, but clutch wear can occur if oil isn't changed regularly, especially with dry clutches.
- Dry clutch: change oil every 60,000 km
- Wet clutch: change every 120,000 km
CVT Transmission
CVTs are considered nearly maintenance-free, but don't like prolonged cruising at constant speed or towing heavy loads.
Change oil according to manufacturer instructions, or every 60,000 km.
