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What Causes Automatic Transmission Failure?

2 Answers

Valeria

07/28/25 9:50pm

The causes of automatic transmission failure are: 1. The hydraulic oil level is too low or too high, generating a large number of bubbles when violently agitated during operation; 2. Excessive wear or burning of the clutch or brake friction plates and brake bands; 3. Excessive wear of the oil pump or leakage in the main oil circuit, resulting in excessively low oil pressure. The troubleshooting methods for automatic transmission failure include: 1. Check whether there is hydraulic oil in the automatic transmission; 2. Check whether the connecting rod or cable between the automatic transmission control lever and the manual valve rocker arm is loose or detached; 3. Check whether hydraulic oil flows out from the pressure measurement hole; 4. Check whether there is looseness between the manual valve rocker arm shaft and the rocker arm, and whether the manual valve core is broken or detached; 5. Check whether the oil pump inlet filter screen is clogged; 6. If there is some oil pressure in the main oil circuit when starting a cold car, but the oil pressure drops significantly when the car is hot, it indicates excessive wear of the oil pump; 7. If a large amount of hydraulic oil sprays out from the pressure measurement hole, it indicates normal oil pressure in the main oil circuit.

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ArthurMarie

08/12/25 2:24am

I just experienced an automatic transmission failure! The car suddenly started shifting as rough as a trampoline, and later it was found that the transmission fluid had deteriorated to the color of soy sauce. The mechanic said this fluid must be changed every two years or 40,000 kilometers, otherwise sludge can clog the fine oil passages in the valve body. Another time, the whole car shook violently when shifting gears—turned out the transmission mount rubber bushing had aged and cracked, causing metal-to-metal contact that transmitted vibrations. If you notice delayed shifting, RPMs soaring without acceleration, or the transmission warning light comes on, don't push it—last time my towing fee was twice the repair cost!

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