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The DQ200 vii speed DSG transmission makes many improvements over its half dozen speed predecessor.

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7 Speed DSG Issues

The 7-speed DSG automatic transmission—or DQ200—is a transmission that is growing apace in popularity. A transverse dual-clutch transmission, it was brought in to supersede the six-speed "DQ250" DSG unit and is finding itself in more and more vehicles. And with that growing popularity comes a growing number of people who may fall victim to some of the faults that can occur with this transmission.

Fortunately, there isn't actually a huge listing of faults with the DQ200. Unfortunately, the faults we take seen so far can exist quite pricey to repair. But before nosotros get into that, allow's briefly go over the differences between this transmission and its 6-speed predecessor.

What's New in the 7-Speed DSG?

The previous 6-speed direct shift gearbox (DSG)—the DQ250—was a single chamber matter, meaning that all the components within the gearbox shared the same fluid. This had the disadvantage that contamination from any component inside the transmission could bear on any other component within the transmission. Considering that one such component was a dual-clutch assembly which, by its very nature, wears downwards and releases minor amounts of droppings, this isn't exactly the all-time setup.

The DQ200 made a lot of changes that brought about amend efficiency and weight savings over earlier models. But the two most meaning changes were separating the hydraulic system from the rest of the manual and moving to a dry dual clutch assembly.

In moving the hydraulic system—the valves and solenoids and other delicate mechanical components that are the control centre of the gearbox—into its own enclosed system, the transmission has a greatly reduced chance of suffering a fault every bit a effect of oil contagion clogging upwards vital components since the only contagion that can get into that chamber would come from the components within.

Simultaneously, moving to a dry clutch assembly removed the biggest source of the aforementioned contamination from the transmission fluid altogether. Information technology likewise made it so you no longer have to open up upwardly any of the transmission in order to modify or supersede the clutch assembly. Although, equally we'll affect shortly, it's not necessarily whatever easier to change the clutch assembly.

So, let's go into those common faults.

Dual Clutch Wearable and Tear

An unavoidable attribute of any clutch system is that it will clothing down over time. It is designed with this in mind, as the whole purpose of the clutch is to "sideslip" in social club to provide a polish transition between gear ratios. The new dry clutch assembly in the DSG DQ200 is much more than akin to a regular manual transmission clutch than the previous DQ250 wet clutch.

The command module for the transmission will attempt to suit and compensate for clutch habiliment over time, however, information technology volition eventually reach a bespeak where the clutch is simply too worn to role properly. When this happens, the most common symptoms one may feel are slipping in gears and "failsafe" fashion.

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Slipping will oft manifest as the engine revving higher than it should. In extreme cases, it may non be possible to bulldoze at all. Failsafe mode—besides known as "default" and "limp" manner—will limit the transmission to a single gear only (often third gear), as well as give some kind of indication on the dashboard. This indicator can come in different forms depending on the vehicle, such as a flashing "PRNDS" display, displaying "Manual Failsafe".

The fashion the dual-clutch arrangement works ways that one clutch is responsible for odd-numbered gears, the other for even-numbered ones. For this reason, having bug in all the odd or even-numbered gears (as opposed to specific gears) is a large indicator that you have a clutch problem.

The dual clutch assembly in a DQ200 7 speed DSG looks much more like a regular manual clutch than in previous versions of the DSG, but is not as simple to fit!

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It'south important to notation that, though the DQ200 dual-clutch associates may look a lot like a manual clutch, changing one is non as uncomplicated a process. It requires special tools and a certain procedure that, if done incorrectly, volition damage the new clutch, and can even damage the transmission itself. Due to the expense of the clutch assembly and the technicalities of fitting it, some manufacturers will only sell these clutches to fitters that accept passed a course and are qualified to fit them.

Electro-Hydraulic Command Unit Failure

This is the carve up hydraulic system mentioned above. Information technology contains all the mechanics necessary for decision-making the shift forks that engage the gears themselves, and the reckoner does all the "thinking" for the gearbox. It is located on the side of the manual—which is towards the front of the vehicle when fitted—and is a self-contained unit, significant it tin be removed entirely and replaced without having to dismantle whatever part of it. The mechatronic can be replaced within the module itself, however, this is an involved task and requires manufacturer-specific diagnostic capabilities.

If the electronic component fails, unfortunately, information technology can manifest in a number of ways every bit it is responsible for all the actions that take place in the transmission during utilize. Failsafe volition be the most probable outward symptom, simply some diagnostic hardware will be required to get any more than information every bit to why.

An easier to diagnose fault is a relatively common problem with the pump inside of the hydraulic control unit. This error will ofttimes result in little or no drive, failsafe mode, and quite oft the unit will spit hydraulic fluid out of the breather on height. This fluid is distinctive from regular transmission fluid due to the fact that information technology is green. The principal fault lawmaking associated with this problem references "Pump Play Protection". Fortunately, this problem can be repaired by a specialist, or the unabridged unit can exist replaced entirely. It would demand to be the whole unit of measurement, even so, as the fault involves more than merely the electronic component.

The control module for the DQ200 7 speed DSG has a number of components that demand to be correctly configured in order to fit back into the transmission.

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Equally with the clutch associates, this is non a job to undertake without the right tools and expertise. The transmission needs to put into a specific configuration earlier removing the unit, and the unit itself needs to exist in that same configuration before beingness fitted dorsum onto the manual. Failure to do and so can result in breaking the unit, or the transmission but not working. The manual can be set to the right configuration for removal of the control module using diagnostic tools, withal, if such tools are non available, it can also exist washed manually. Be warned, yet, information technology is incommunicable to see if everything is lined up correctly once the unit is lifted into place. In curt, make very sure everything is prepare correctly before fitting considering you won't be able to verify if you've done it right until you lot try and drive the vehicle and notice you lot're missing gears.

And that's information technology. There really aren't that many common faults for the 7 speed DQ200 DSG transmission, and one of those faults is a simple and unavoidable matter of wear and tear. All in all, that's great for an automatic manual.

This article is accurate and truthful to the best of the writer's knowledge. Content is for informational or entertainment purposes simply and does not substitute for personal counsel or professional communication in concern, financial, legal, or technical matters.

© 2018 John Bullock

Source: https://axleaddict.com/auto-repair/Common-Faults-in-the-7-Speed-DSG-Automatic-Transmission

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