How to Solve the Jerking Issue at 40 mph in Buick Regal?

[ClaraAnn]

Currently, the more conventional solution is to replace the transmission fluid. The following are the reasons for the occurrence of impact and jerking in the transmission: 1. Persistent dirt accumulation: In many cases, it is not the internal valve body that is damaged, but rather the presence of persistent dirt and impurities inside, especially when dirt and impurities accumulate inside the valve body, forming blockages that prevent effective regulation of oil pressure, leading to jerking, impact, and slippage issues. 2. Improper combination of speed, output torque, and gear engagement: The relationship between speed, output torque, and gear engagement, where engine speed, driving speed, and gear must be mutually matched, is maintained by the torque output of the engine. Therefore, any imbalance in this relationship can cause impact and jerking in the transmission.

[JaxonAnn]

I've been driving a Buick Regal for many years and have encountered the 40 mph jerk a few times, probably caused by the transmission not shifting smoothly at low speeds. Common reasons include deteriorated transmission fluid leading to unstable oil pressure, or the control module needing a software update. I recommend checking the fluid condition—replace it with fresh oil if it's turned black, and use a diagnostic scanner to check for trouble codes if necessary to rule out sensor issues. Also, don't overlook aging spark plugs causing engine vibration, which directly affects shift smoothness. Address the issue early—delaying could damage internal gears and increase repair costs. Regular long-distance driving helps warm up the transmission and reduce such problems. In short, if you notice anything unusual, prioritize safety and consult a professional technician as soon as possible.

[DelLaura]

As a female Buick owner who drives frequently, it's really annoying when the car suddenly jerks at 40km/h, feeling like alternating between braking and accelerating uncomfortably. It might be an issue with the automatic transmission logic or too much dust on the sensors affecting the signal. I remember it happens more often during hot summers, so I suggest checking if the air filter and throttle body are dirty, causing engine instability. If you're good at DIY, try cleaning the fuel injectors yourself; otherwise, spend a few hundred at a repair shop for maintenance. From a safety perspective, don't take it lightly, especially on rainy days when the roads are slippery—the jerking becomes more dangerous. If it needs fixing, don't hesitate to spend the money. My car improved a lot after I replaced the fuel filter last time.

[OHazel]

Hey car enthusiasts, 40 mph jerking in a Buick is mostly due to improper transmission shift timing or ignition system failure. I've been tinkering with mechanics for years, and an outdated ECU software version can send erratic commands; you might solve it by connecting to a computer and refreshing the program yourself. Worn-out spark plugs with insufficient current can also make the engine gasp, directly affecting the transmission. If you're handy, you can unplug and clean the contacts to prevent oxidation. For severe cases, check if the transmission oil pressure pump is leaking. To prevent issues, don't exceed the oil change interval—saving money shouldn't come at the cost of your car's lifespan.