Haldex transmission operation

The name Haldex, well known to fans of all-wheel drive vehicles, comes from the brand that made it. But now Haldex is owned by Borwarner.

What is this?

Haldex AWD system provides rear-wheel drive for vehicles with transverse enginetherefore, it is an add-on that can theoretically be grafted onto any self-tensioning device.

However, there are two conditions: it is necessary that the front differential is adapted to transmit power to the rear, therefore a shaft is also required. The second condition concerns the rear axle, it is necessary to have a multi-link, and not a torsion-bar axle, which, however, is found in most public cars (in the premium class it is systematically multi-link, with the exception of some manufacturers. Twisting the rear axle would cause strange behavior in the vehicle.

How does Haldex work?

4X2 mode

La Quattro transmission (transverse and Ultra) / 4Motion therefore is not permanent

Well, in the end it's pretty easy to figure out, so it's about connecting the front differential to the rear differential using a shaft. In addition, in order to be able to decouple the rear and therefore switch to 4X2, we have a Haldex transfer case that can be engaged or disengaged. This is achieved through a wet multi-plate clutch, which is much more load-bearing than a simple dry clutch.

These clutches are controlled by a computer that controls the Haldex electro-hydraulic system. Electric actuators create hydraulic pressure (using centrifugal force) in the circuit to press the discs and thus create a bridge between the front and rear axles.

Here is a diagram of the operation of the Haldex side electro-hydraulic control system.

On a longitudinal engine?

Although Haldex is not a developer, Audi has implemented a more economical model in its latest versions of the Quattro (for less powerful engines), a transfer case that replaces the Torsen and which works a bit like Haldex, which is what we call the Quattro Ultra. (Audi's Ultra badge stands for economical, like Eco2 in Renault or EfficientDynamics in BMW).

Compared to Thorsen?

The two systems have nothing in common, even if their role is to transfer/distribute power between front and rear. Torsen is a differential

constant

(here there is a permanent connection, unlike Haldex, which is disengaged), consisting of gears that prevent too much slip between the speeds of rotation of the two connected shafts (so-called limited slip differential).

Thus, due to the design of the gears, this limited slip effect is achieved, one side cannot rotate much faster than the other.

However, we could combine Haldex and Torsen in the same system - the Crown-Wheel differential that has been used since the 2010s on the Quattro.

Reliability of Haldex? Your feedback

Here are some testimonials automatically generated from your testimonials on the site's test sheets. Do not hesitate to do the same if you also encounter a problem with this device.

Seat Leon (1999-2005)

V6 (2.8) 204 hp of 2001 186000 km : Engine temperature sensor Air mass meter Camshaft + crankshaft sensor as well as ABS and ESPSystem Haldex (4 × 4) defective

Land Rover Range Rover Evoque (2011-2018)

2.2 SD4 190 HP 2013, 83000 km automatic transmission, 19 '' prestige trim CROSS CLIMATE : During "impaired start", replacement of the flow meter at 82000 km, replacement of the rear electric parking brake, after jerking in a 6-speed automatic transmission, replacement of fluids, jumpers and Haldex, update, problems solved, smooth and smooth ride as

Skoda Superb (2008-2015)

2.0 TDI 170 HP DSG6, 160000 km, December 2013, 16” winter rim 17” summer, 4×4 : Pump Haldex at an altitude of 160000km

Land Rover Range Rover Evoque (2011-2018)

2.2 SD4 190 channels BVA6, 185000 km / s, 2012 Prestige 5p : This is the subject of my post to share a problem that I have had for some time and which I have just resolved. This applies to the gearbox, or rather the rear transfer case and the famous pump. HaldexProblem The message transmission failure, special programs disabled appears very randomly for a year and a half, and remains constant to this day. Consequence The car will never run in 1 × 4 mode again. It will remain at 4. Three times I gave the car to the LR. They couldn't find it. Two weeks ago, since the problem was systematic, it took me 2 (three!) Days to diagnose. Result without a really good explanation or error code, he gave me a suggestion to replace the electronic box on the front gearbox. In short, MO + Box oil (3¤HT per liter ... and you need 46!) Box at 7¤HT, rating 800¤. Looking on the net, I noticed some similar problems, the cause of which was a malfunction of the pump Haldex (connected to the rear axle), is solved by simply replacing a small filter by 50¤, disassembling / cleaning the pump (there is a very small filter inside, and he does it swarm -), all in not even an hour. I call LR, explain myself and answer: “No, pumps. Haldex, we do not have a special maintenance program ... Moreover, we never change gearboxes, they are lubricated for life. " I'm dreaming. Programmed obscuration when you hold us -) You surprise me, they prefer to change, see how you quote, what kind of renovation I don't know which one, but in any case, not your problem. To summarize, LR's after-sales service is really not very good. To verify the malfunction, a small mechanic removed the connector from the pump, took a small battery and turned it (which, by the way, is not discharged) in BOTH directions. This pushed out the dirt and solved the problem, no more messages, 4x4 gearbox, special programs, everything is flawless. ... Decided for a moment ... Dirt returned to the small filter of the pump. But the failure is here, and the reason is well understood. I also have to replace other filters and oil, of course. In short, instead of 2000 it will cost me, maximum 70¤, I will do it myself too (great tutorial on the internet). Error code U0437 (under code 68) The data coming from the rear differential control module is invalid (this is definitely this code that LR saw and set the score ... laughing out loud. They didn't even run the above test) Code 1889 Oil pressure pump in the module rear differential. After several measurements, the latter remains constant. Oil pressure -> filters clogged, etc. CQFD

Seat Leon 3 (2012-2020)

2.0 TDI 184 HP X-perience white DSG6 Full option, from 2016, 78000 km, 18 discs : Purchased at 52000 km, belt noise at 60000 150. Change of belt accessories from my little mechanic (900. noise is still present, steering seat. Support for belt replacement invoiced 150th (pb known on tdi 184/62000 ) rear 250, rear Left bearing replacement 75000e Rear bearing noise at XNUMX, probably rear right bearing sometimes strange engine noise Maintenance and DSG system Haldex 70000 400e

Skoda Yeti (2009-2017)

2.0 TDI 140 hp 4X4 2L 140CV AMBITION : Coupling Haldex very efficient indeed, but its control (electronic / hydraulic) is sometimes surprising. Especially after changing the oil in the clutch. Indeed, the system is quite sensitive / unexpected when exiting a roundabout or, for example, when turning at a very low speed; as if he had discovered the need to switch to 4X4 (4X2 shift control -> electronic 4X4… .. indeed this type of transmission is not permanent in reality) 160 km EGR valve problem. 000¤ at my expense, because my car was no longer under warranty. Attention, replacing the exhaust gas recirculation valve on the 800X4 version requires lowering the front axle (hence ¤4). It's important to know, especially if you don't need the 800X4 version.

Seat Leon (1999-2005)

V6 (2.8) 204 channels : Camshaft, crankshaft, ABS and ESP HSS sensors Haldex(4 × 4) defective.

Vauxhall Insignia (2009-2017)

2.8 hp : -box for 47000 km-Haldex at 7000, 11000, 34000 km

Skoda Octavia 2013-2019

2.0 TDI 150 hp SKODA Scout 2015 51 km : Player revision key (fixed in the garage), adaptive lighting malfunction (disappeared by itself) plus sporadic pump malfunction Haldex when reading faults (after overhaul 51000 4 km / XNUMX year) ... to be continued depending on the garage.

Sidenje Ateca (2016)

2.0 TDI 190ch Bva FR. 2018 : Transmission of infection. Clutch Haldex hs

Audi A3 (2003-2012)

2.0 TFSI 265 hp Manual 6, 175000km, 2008, Quattro : door opener motor, abs sensor problem, pump problem Haldex, a gear lever that does not return to the center position

Skoda Octavia 2013-2019

1.6 TDI 105 HP 150000 11 km year 2011/4 4 × XNUMX : system problem Haldex for 40000 km (disassembly and reassembly in the garage without finding out the reason) 2 rear springs broken in several places of the gas engine about 130000 km, water pump leaks for 150000 XNUMX km

Seat Leon 3 (2012-2020)

2.0 TDI 184 channel X-perience DSG 4drive 30000 km / s JA17 ″ : electro-hydraulic pump Haldex, shock absorber cups, creak of rubber windshields, engine noises, reading SMS.

Skoda Octavia 2013-2019

2.0 TDI 150 ch 4X4 100000 hp : Haldex + Rack + oil consumption

Land Rover Range Rover Evoque (2011-2018)

2.2 SD4 190 HP Auto 56000km 2012 dynamic sd4 : Haldex for 42000 km is not taken under warranty (3300 euros) New problem Haldex at 56000 km (see)

Volkswagen Tiguan (2007-2015)

2.0 TSI 210 HP Automatic, 84 : 0 reliability = 4 engine oil leaks + 4 differential pump leaks (Haldex) + differential Haldex which always remains in 4 × 4 mode (= noise at speeds over 80 km / h) + the ventilation motor must be replaced because it requires too much current (2 resistors burned out). A real lemon in my case ...

Skoda Yeti (2009-2017)

2.0 TDI 140 ch manual-55000-2015-editioo : Problems Haldex Traction error 4×4 without warning - immobilizer key on skoda

Skoda Superb (2008-2015)

3.6 TFSI 260 HP 2011, 132000 km, sports chassis, 18-inch wheels, combo sunroof : - Cooling water consumption, no cause found, engine changed at 52 km - oil-water heat exchanger at 000 km - booster pump Haldex hs at 131'00 In Switzerland, I was able to extend the warranty. The garage and the importer are faultlessly versed in breakdowns. With the included mobility service, a new car was brought to my place.

Land Rover Range Rover Evoque (2011-2018)

2.2 sd4 190 hp BVA 6, 65000 km, 2012 : Pump failure Haldex

Audi TT (1998-2006)

3.2 250 ch 98000, 2005, DSG coupe : oil in the gearbox leaks repeatedly, when I went to service it in Audi (visit once a year), then with Volkswagen zero leaks (within 3 years), Haldex Who shits (sorry for the word) in winter weather, slow DSG with a sudden turn on of automatic mode, interior plastic that vibrates so it ages a lot, leather quality, sound system quality that deteriorates over time, many problems with electronics and, finally, shock absorbers that break (twice in winter weather -20 degrees)

All comments and reactions

Dernier comment posted:

JLB (Date: 2019, 12:15:19)

Vw detects metal shavings in the insurance-covered haldex on the 2014 10/19 Tiguan at 90000 km. thanks

Il I. 1 reaction (s) to this comment:

• Administrator SITE ADMINISTRATOR (2019-12-16 15:27:13): Feel free to report it on the vehicle test sheet! Information will rise on reliability sheets ...

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