What are the consequences of insufficient transmission fluid?
2 Answers
If the automatic transmission lacks sufficient fluid, it will affect the oil pressure, leading to clutch plate damage and transmission wear. Hazards of excessive automatic transmission fluid level: The automatic transmission may leak oil externally: If the transmission fluid level is too high, the rotating components will come into contact with the fluid during operation. Under the high-speed rotation of components such as planetary gear mechanisms or clutters, the fluid will expand and boil, causing it to leak out from the filler hole and vent valve. It may cause shifting shock: Excessive air entering the fluid can also cause air blockage at the drain holes on the control valve body, leading to poor drainage and resulting in shifting shock. It may cause low working oil pressure: An excessively high automatic transmission fluid level allows the rotating components to reach the fluid, causing agitation and generating bubbles in the fluid. When the fluid with bubbles enters the oil pump, the pump cannot establish the required oil pressure. It reduces the cooling function and transmission efficiency of the transmission: The main functions of transmission fluid are lubrication and cooling. The transmission fluid dissipates heat through the transmission housing and transmission cooler. If too much fluid is added, the gears will encounter greater resistance during rotation, reducing the cooling function and transmission efficiency of the transmission. This requires the engine to consume more fuel, thereby decreasing the overall fuel economy of the vehicle.
Low transmission fluid has significant impacts, as the transmission relies entirely on the fluid to lubricate gears and dissipate heat. Insufficient fluid increases friction, causing jerky and unsmooth gear shifts, making the clutch feel stiff. Over time, internal temperatures soar, leading to severe wear on gears and bearings, resulting in clunking noises. In the worst cases, the transmission may completely seize, rendering the vehicle undrivable and requiring a tow to the repair shop for a costly replacement, costing thousands. Fuel consumption also rises due to reduced efficiency, forcing the engine to work harder. It's recommended to regularly check the fluid level—after parking and when the engine is cold, ensure the dipstick reading is between the min and max marks. If the fluid turns black, it's time for a change. Generally, maintenance every two years can prevent major issues.
