Why does an AT transmission have a jerky start?

[DiAngela]

The following are the reasons for a jerky start in an AT transmission: 1. Internal clutch pressure leakage: Solution: Inspect the clutch for damage and carry out repairs. 2. Transmission oil passage blockage or poor flow: Wear in the oil passage plate, long-term lack of transmission fluid replacement leading to deterioration and reduced lubrication effectiveness, excessively dirty transmission filter causing poor filtration, allowing wear particles to enter the valve body. 3. Transmission fluid not at the proper level: Check whether the transmission fluid is at the proper level. If the transmission fluid is too low or too high, it can affect the occurrence of this issue. Vehicles with a transmission dipstick can check the dipstick while the engine is running to see if the fluid level is within the standard range. 4. Solenoid valve damage: Sludge in the transmission fluid circulating within the transmission can block the oil passages in the valve body, leading to jerky shifting. Over time, this can cause a series of transmission issues such as overheating, jerking, slipping, etc.

[ONatalie]

I've also experienced automatic transmission jerking during takeoff before, it feels like being pushed suddenly. The issue usually lies with the transmission fluid - when the oil gets too old or insufficient, internal pressure becomes unstable, causing rough gear shifts. Worn clutch plates or improper adjustment can also lead to shuddering. Some problems stem from electronic control modules, like faulty sensors causing incorrect computer commands that trigger jerking. I've handled it myself by regularly checking fluid levels and color - just replace all the fluid if it's dirty, don't wait until internal components get damaged. Temperature also plays a big role; oil gets too thin when overheated in summer, and too thick in winter. The maintenance manual specifies fluid change intervals - preventive maintenance is most effective.

[MollyAnn]

A jerky start with an automatic transmission may indicate a control system malfunction. Inaccurate signals from electronic modules or sensors can lead to incorrect computer judgments, resulting in improper oil pressure. Pay attention to both the quality and level of the transmission fluid, as low levels or contamination can clog valves. In my experience helping others inspect vehicles, such issues are common. It's advisable to use the onboard diagnostic port to read fault codes—it's inexpensive and helps pinpoint the problem. If the electrical circuits are fine, check for worn clutches or torque converters. Early repairs can prevent more significant damage.

[Barry]

My car was shaking badly when starting, and it turned out the transmission fluid was low. After adding some myself, the situation improved. It might be because I drive too aggressively, stomping on the gas pedal and making the gear shifts overly tense. The accumulated impurities from not changing the oil for a long time can also clog the pipes. I went to the repair shop, and the mechanic adjusted the shift logic, which significantly reduced the impact. Gentle operation and maintenance are crucial.