Learning to drive a vehicle is not always unproblematic, and often it may seem like a good solution to choose an automatic Toyota Sienna, if it’s for basic convenience or ease of use, this type of transmission is becoming more and more wide-spread. Nevertheless, although they may seem like a perfect choice, there may possibly also be complications with the automatic gearboxes of your Toyota Sienna . This is exactly the theme of our article. First, we’ll quickly describe the different types of automatic gearboxes, then, in a second step, which complications you may possibly come across with the gearbox of your Toyota Sienna , and, finally, how to solve them.

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The different kind of automatic gearbox of a Toyota Sienna

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Gearboxes have the benefit of being reputed to be reliable, as you don’t need to use your clutch pedal and everything is electronically and mechanically managed there will be no early wear of your clutch or other elements that could be put to the test by misuse on your part.
Nevertheless, based on the type of automatic transmission your Toyota Sienna is equipped with you will have more or less reliability, we will introduce them to you now:

  • Common automatic gearbox: It will use a torque converter, which will control the gear changes, it’s the oldest technology, it has evolved a lot in the last decades (more gears and a better management of the gear changes).
  • Robotized automatic gearbox: This is a manual gearbox with a robotized mechanism that will replace the driver’s action. This type of gearbox is less and less basic because they are viewed as very slow. We also generally feel a coupling during deceleration.
  • Dual-clutch automatic transmission: This is the greatest automatic transmission, it works on the same concept as the robotic transmission, but thanks to its dual clutch, you won’t have any more complications with slow speeds or increased fuel consumption. They are often fitted on luxury models.
  • Continuously variable automatic box: It is the same theory as on a scooter, a variator will come to control the differences between acceleration and motor speed, they are really slow and tend to be unresponsive during the acceleration phases of your Toyota Sienna.

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I’m having complications with the automatic transmission on my Toyota Sienna

We now start the part that definitely attracts you the most in this post, what are the complications you may encounter with the automatic transmission of your Toyota Sienna? As explained above, generally speaking they are more reliable than manual transmissions, nevertheless, here are the most important complications you may come across:

  • As revealed over, no matter what type of automatic gearbox, they are generally known to be slow and have inertia when accelerating. Nevertheless, this phenomenon is supposed to occur just when the car is started, not when it is launched. If it feels like it happens constantly, the clutch or converter is most likely dead.
  • I have the feeling that a gear in the automatic transmission of my Toyota Sienna no longer shifts or jumps: If you have the feeling that your gears no longer shift or tend to jump on your Toyota Sienna, there is a part that is undoubtedly responsible for this failure. Obviously, the solenoid that works as a “switch” to engage the gears must not be working properly, second option, a speed or engine speed sensor may be faulty and send the wrong information to your gearbox.
  • If you feel drops coming from the automatic gearbox of your Toyota Sienna: If you feel a clutch when you go up or when you slow down, it is either your oil which is too old and which does not lubricate any more adequately all the mechanisms of your gearbox, or else a sensor which gives bad information

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  • My Toyota Sienna’s automatic transmission is leaking: Finally, if your Toyota Sienna’s automatic transmission is leaking, it’s most probably one of your spy seals is too worn.

How do I fix automatic transmission complications on a Toyota Sienna?

And finally, we’re going to try to give you the methods to correct the automatic transmission complications on your Toyota Sienna . Find them down below:

  • Oil leak on the automatic gearbox of a Toyota Sienna: Find the origin of the leak, and replace the concerned gasket, get it achieved by a professional, opening a gearbox is not easy. It will cost you a few hundred euros, specifically for the labour. Do not hesitate to read our article on gearbox oil leaks on Toyota Sienna.
  • Sensor issue: No matter which sensor is involved, a replacement is the just solution, sensors do not repair themselves, you should count from 100 to a few hundred euros depending on the difficulty of access to the one that concerns you.
  • Couplings: If you have complications with the couplings on your Toyota Sienna, you will only need to do a whole gearbox replace to gain comfort and preserve your gears.
  • The automatic gearbox of my Toyota Sienna slips: In such a case, you certainly have a dead clutch disc, you will have to replace the clutch, and on some models you won’t have the ability to replace it without doing a standard exchange of the gearbox, be prepared to spend more than a thousand euros.

There are other automatic transmission complications on Toyota Sienna, such as electronic problems or pressure complications, but this list lists the most important ones, whatever the case, for such difficult mechanisms. Once you feel a problem on this level, we advise you to go quickly to your mechanic.

In the event that you have any further questions about the Toyota Sienna, do not hesitate to consult our Toyota Sienna category.