What Are the Causes of Automatic Transmission Failure?
3 Answers
Automatic transmission failure can be caused by excessively high transmission temperature, hydraulic fluid level being too low or too high, or transmission gear slippage. Excessively high transmission temperature: After high-intensity driving, the transmission temperature can rise abnormally, triggering the warning light. In such cases, simply parking the car and allowing the temperature to naturally decrease is sufficient. Hydraulic fluid level too low or too high: If the hydraulic fluid level is too low or too high, it can generate excessive air bubbles when violently agitated during operation. In this situation, it is necessary to check whether there is hydraulic fluid in the automatic transmission. Generally, transmission fluid should be replaced or topped up after the car has been driven approximately 50,000-80,000 kilometers. Transmission gear slippage: If the warning light is triggered due to transmission gear slippage, it is advisable to visit a repair shop or 4S store for professional inspection.
As someone who frequently repairs transmissions, automatic transmission failures can occur in several areas. The most common issue is with the fluid—either the level is too low or the fluid is too dirty and deteriorated due to not being changed on time, leading to insufficient lubrication and severe component wear. The solenoid valves control the oil pressure; if they get stuck or fail, it can affect the smoothness of gear shifts. In terms of the control module, electrical shorts or software malfunctions can cause the entire system to shut down. Mechanical components like clutch plates or planetary gear sets can also fail if excessively worn. In daily driving, prolonged towing of heavy loads or rapid acceleration can accelerate wear. During inspections, start with the fluid—if it turns black or has a burnt smell, it's time for a change. I've found that preventive maintenance is cost-effective; checking and replacing the fluid every 30,000 kilometers can avoid major repairs costing thousands. Neglecting timely repairs may result in loss of power, posing safety hazards.
From my daily driving experience, automatic transmission failures are primarily related to improper maintenance. Insufficient or leaking fluid is a common occurrence, and prolonged intervals between oil changes can lead to dust accumulation that clogs the system. When solenoids and sensors malfunction, the car may produce strange noises or vibrations, with delayed or jerky gear shifts. Control unit failures can result from water damage or aging, causing the transmission to lock up. I've seen cases where aggressive driving or frequent hill climbing increases the load, leading to premature wear of internal gears. For prevention, I adhere to regular vehicle inspections, such as changing the fluid every two years and checking the seals. Neglecting these small tasks can result in costly major repairs. Additionally, cultivating smooth driving habits, like avoiding sudden braking and acceleration, can extend the transmission's lifespan. Safety comes first—if any abnormalities are noticed, stop and inspect immediately.
