Reasons for automatic transmission failure in a Chevrolet Aveo:
*Low transmission fluid level: Check fluid level and add fluid if necessary.
* Faulty speed sensor: The speed sensor transmits vehicle speed information to the transmission control unit (TCU), and a faulty sensor can cause the automatic transmission to go into limp mode.
* Malfunctioning solenoids: The solenoids in the automatic transmission control gear shifting, and malfunctioning them can cause the automatic transmission to go into limp mode.
* Malfunction of the transmission control unit (TCU): The TCU is a computer that controls the automatic transmission, and its malfunction can lead to the automatic transmission going into emergency mode.
*Mechanical failure (rare): In some cases, mechanical problems, such as worn gears or bearings, can cause the transmission to go into limp mode.
Emergency actions:
* Reduce speed to a safe level.
* Pull to the side of the road.
* Turn off the engine.
*Wait a few minutes.
* Start the engine again.
If the emergency mode does not reset after restarting the engine, it is recommended to seek professional help from a car service center.
Diagnostics and repair:
Diagnostics of an automatic transmission operating in emergency mode usually includes:
* Scan fault codes
*Transmission fluid testing
* Checking sensors and solenoids
* TBU diagnostics
Depending on the cause of the emergency, repairs may include:
* Replacing transmission fluid
* Replacing the speed sensor or solenoids
* Repair or replacement of fuel pumps
* Sometimes a major overhaul or replacement of the automatic transmission is required
To prevent the automatic transmission from going into emergency mode, it is important:
* Check the transmission fluid level regularly.
* Change the transmission fluid and filter in accordance with the manufacturer’s recommendations.
* Avoid harsh driving and towing heavy loads.
* Carry out regular vehicle maintenance.