Analysis of Volkswagen DSG failures

As for the Volkswagen DSG (DCT), I agree with the national expert: "It is not adapted to the soil and water in China, because the domestic road conditions are very poor, and the traffic jams are more serious." ”

It's amazing, if you don't get used to it, please go home, don't play with us. The Germans are so rigorous in solving problems, huh?

Although these situations have occurred but may be related to the displacement, I don't know if Magotan has these problems, the maximum torque has been close to the vehicle limit, in the process of refueling, it is equivalent to the engine pressurizing a low-bearing transmission, the general naturally aspirated engine only about the torque can reach 220 Nm, and this kind of situation occurs mostly between gears, or long-term traffic jams, and there is basically no such situation when the road conditions are good.

When stuck in traffic, shift the gear lever to N gear and let the clutch rest.

The manual says: It is recommended to use less n gears! Who should I listen to?

Whatever the reason, if there are so many problems, we should be given an extension to a 10-year warranty.

"Death flashing": refers to the vehicle equipped with a DSG gearbox in the normal driving process, suddenly downgraded to 1st gear, at the same time, the gear indicator flashed wildly, and the downshift was only downshifted according to the odd or even number.

You're still quite professional and right.

The official results given by Volkswagen are caused by the temperature sensor of the transmission. I don't think it's the sensor that's malfunctioning, it's that the temperature has really risen. DSG is not like an ordinary AT with a torque converter to transmit power, it still relies on the clutch to transmit power, in the city, it is generally driving at a relatively slow speed, at this time the clutch is in a semi-linkage state, because there is no power when completely separated, and the full linkage power is too large and difficult to control.

Normally, the clutch will overheat, and the sensor will sense that the temperature is too high, and it will issue a command, and the transmission will stop. In this regard, Volkswagen does not think that there is a design problem with the DSG, and the recalled cars are all oil temperature sensor wires are not clamped, and the sensor will send an error signal to the control unit, resulting in the control unit starting the maintenance mode, the power is interrupted, and the indicator light flashes wildly, which is the "death flash".

The Germans have always been known for their rigorous quality, and the Germans' persistence is famous, especially the insistence on the maximum efficiency of machinery, which is impossible to change.

Mine is also a Volkswagen car, its quality is obvious to all, please believe Volkswagen, believe in DSG

Summary. If the display is the failure of the electromechanical control unit of the gearbox, this may be the solenoid valve stuck inside, or it may be that there is a problem with the circuit board in the electromechanical control unit that causes this phenomenon, you can disconnect the negative pole of the battery for a minute and then reconnect it to try, if it still does not work, then it needs to be detected by the computer, according to the computer detection. Fault** to deal with repairs.

Volkswagen DSG transmission electromechanical unit failure.

If the display is the failure of the electromechanical control unit of the gearbox, this may be the solenoid valve stuck inside, or it may be that there is a problem with the circuit board in the electromechanical control unit that causes this phenomenon, you can disconnect the negative pole of the battery for a minute and then reconnect it to try, if it still does not work, then it needs to be detected by the computer, according to the computer detection. Fault** to deal with repairs.

Excuse me, mine is a 14-year-old Passat, and suddenly there is no gear display during driving, this is a dual-clutch gearbox, this is a problem with the electromechanical control unit in the gearbox, there is a problem with the circuit board inside or the solenoid valve inside is stuck. Disconnect the negative pole of the battery for a minute and then reconnect it to try, if it still doesn't work, then you need to use the computer to detect, according to the fault of the computer to deal with the repair.

Use the computer to detect and display that there is no communication on the gear lever.

That's the need for this circuit board inside this gear lever to have a problem. You need to check the circuit board inside under the gear lever.

As far as I know, Volkswagen's DSG has been constantly improving, and it is said that the 7-speed wet dual clutch, no problem, the piece is purchased wet.

It depends on what kind of fault it is, and the general fault can still be handled.

DSG is the first mass-produced dual-clutch transmission series to be assembled...

In terms of engineering, the difference between mass production and small batch will find many potential problems caused by long-term mechanisms, in fact, it is normal to break (such as the problem of the temperature sensor), but the fault is that the treatment after the break is not appropriate, which is not considered in advance. Mass production is subject to cost and production difficulty, so there are some compromises to be made. In the process of reducing redundancy, some analyses such as FMEA may be biased, resulting in the reliability of some parts.

This is also due to inexperience.

Or maybe the design strength somewhere is not enough, and the heat dissipation is not good. These are also accumulated by the experience of using a large number of times over a long period of time in traditional gearboxes.

In short, it is still immature and lacks experience in production and use. Although dual-clutch transmissions were built a long, long time ago, it is estimated that it will have to wait a little longer to become as reliable as the MT... But it's one thing to be immature, it's another thing to buy it.

This little problem shouldn't affect the new technology experience...

If you want to buy it, it is recommended to buy, anyway, the car with DSG is not expensive, DSG is now extended to 4 years, basically this car has been driven for four years, and it can be sold.

This is all due to the immaturity of the technology.

The 6-speed DSG of the old Magotan is a wet dual-clutch transmission of the DQ250, and it doesn't seem to be a big problem.

The problem is that Volkswagen uses a hydraulically controlled 7-speed DQ200 dry dual-clutch transmission (DSG), Volkswagen's dual-clutch transmission controls the clutch and shift mechanism through an electronically controlled hydraulic system, and Volkswagen's DQ200 is very distinctive in the design of the oil circuit, its gearbox and control module are two independent fluid spaces, and it is not like other hydraulic automatic transmissions or wet dual-clutch transmissions that use the same oil as gear oil and hydraulic oil at the same time.

The total fluid consumption of DQ200 is only gear oil and hydraulic oil 1L) Compared with the traditional automatic transmission and wet dual-clutch transmission, the transmission oil used is nearly halved, Volkswagen explained that the DQ200 is a maintenance-free design, even if it needs to be maintained later, it also has a clear advantage in cost.

The 6-speed DQ250 wet dual-clutch transmission, which has no problems, uses more than 6L of fluid, and the total fluid of the DQ200 is less than half of it. It is also the formula of the hydraulic oil codenamed G004000 that leads to a series of problems such as the failure of the slide valve box caused by the later "crystallization" (crystallization may occur on the valve of the electric control unit after the vehicle is parked for a long time, eliminating the phenomenon that the engine cannot be put in gear after starting, and the vehicle cannot drive normally).

The so-called "fault defect" is an inherent deficiency in the design, so the problem is certain. The time of failure varies according to the different conditions of use, so some problems occur from 3 to 4000km, generally after 40,000 km, most of them appear at 60,000 km, and the most faults are shift impact and can't hang up the gear. But it doesn't matter, when you feel that something is abnormal, you can ask the 4S store to replace it for free.