All-Wheel Drive Coupling Haldex Generation 5 (GEN 5)
Audi S3 2017 Facelift fitted with a Haldex Gen 5 AWD Coupling
Illustration of Generation 5 All-Wheel Drive Haldex Coupling
About:
The Fifth Generation Haldex All-Wheel Drive Coupling can be found on most of the high performance VAG vehicles produced between 2012-2021.
The GEN 5 Haldex Coupling comes with an integrated Haldex Control Module and the Centrifugal Electro-Hydraulic (CEH) Actuator/Pump.
Unlike the previous Generations of the Haldex Coupling, the GEN 5 Haldex Coupling is not fitted with a separate filter, this has been replaced with a larger strainer basket/Gauze fitted to the end of the CEH.
The strainer basket is something that is often overlooked when your vehicle is being serviced at the dealerships. As the above picture shows these baskets often become clogged and are therefore unable to pass oil freely to the multi plate clutch packs.
The AWD coupling activates before the wheels at the front to the vehicle start to slip, this eliminates almost all traction loss.
The Haldex GEN 5 coupling can be in use 100% of the time if required, however, under normal low load driving conditions the rear axle drive is decoupled. This setup is more economical and will save fuel but also provide the safety and performance of an AWD when required.
The electro-hydraulic oil pump and Haldex Control module work seamlessly within a fraction of a second to engage AWD and if necessary, can send 100% of the power to the rear axle only.
The setup of the differential is to use Situation-Based power distribution, this is monitored by the Haldex Control Module (see image below), which powers the Haldex Pump to send oil to activate the multi plate clutch.
As the oil pressure increases, the multi-plate clutch will engage and distribute the desired torque for the rear axle to regulate power and increase traction.
On the MQB platform VAG vehicles, the GEN 5 Haldex Coupling also acts as a Four-wheel front and rear electronic differential lock (EDS).
If an individual wheel starts to slip, the EDS will apply the brakes briefly allowing the transfer of power to go directly to the opposite wheel providing uninterrupted traction through difficult conditions. In platforms like the Golf R (MK7 & 7.5) and Audi S3 (8V) the EDS is installed on both the rear (longitudinal) and front axles (transverse) and therefore these vehicles have four-wheel EDS.
As an optional extra some VAG vehicles are also fitted with XDS+. The XDS+ setup allows the vehicle to brake and individual wheel while on the inside of a bend for optimised performance steering, this will compensate for understeer whilst cornering.
Servicing Intervals for a GEN 5 Haldex Coupling
The below vehicles from VAG are fitted with the GEN 5 Haldex All-wheel drive coupling:
| 1st Oil Service | Oil & Filter | Oil Capacity /refill Quantity |
| 10,000 – 20,000 Mile or 24 months | Every 10,000 Miles or 24 months | 850ml / 650ml |
| All-Wheel Drive Coupling Haldex Generation 5 (GEN5) |
| Audi A3 S3 RS3 8v Sportback Quattro 2012 – 2019 |
| Audi S3 8Y 2020 – present |
| Audi Q2, SQ2, Quattro 2016 – 2019 |
| Audi Q3 RS 8u and F3 Quattro Vorsprung 2012 – 2019 |
| Audi TT TTS TTRS Mk3 FV / 8S Coupe/Roadster 2014 – 2019 |
| Volkswagen Golf, R, 4Motion Mk7 5G, 2012 – 2019 |
| Volkswagen Passat, 4Motion, Santana, Alltrack, 8th Gen 3G, 2015 – 2019 |
| Volkswagen Sharan, Syncro, 4Motion, 7N 2nd Gen, Post 2015 Facelift, 2015 – 2019 |
| Volkswagen Tiguan Mk2 5N, 2015 – 2019 |
| Volkswagen Transporter T6, 2016 – 2019 |
| Volkswagen Caddy 2K 2015 Facelift Onwards, 2015 – 2019 |
| Volkswagen T-Roc R 4Motion, 2017 – 2019 |
| Volkswagen Arteon 2017 – 2019 |
| Seat Alhambra 2014 – 2019 |
| Seat Leon 5f Mk3 2012 – 2019 |
| Seat Leon Cupra Mk4 Estate 4Drive 2021 – present |
| Seat Ateca 2016 – 2019 |
| Seat Arona 2017 – 2019 |
| Seat Tarraco 2018 – 2019 |
| Skoda Octavia Mk3 5E, 2012 – 2019 |
| Skoda Kodiaq, Scout, vRS, Sportline, 2016 – 2019 |
| Skoda Superb Mk3 B8 Type 3v, 2015 – 2019 |
| Skoda Karoq 4×4, 2017 – 2019 |
| Skoda Yeti 4×4 2014 – 2018 |
Service Guide & Parts for a GEN 5 Haldex Coupling
Required Parts for Servicing the Haldex GEN5:
| · Haldex Oil (VAG-G060175A2) |
| · Pump Gasket Kit (HAL-0CQ598305) |
| · Drain Plug & Seal (VAG-N90281802) |
| · Drain Plug & Seal (VAG-N91082701) |
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Haldex Servicing Tools:
- 8mm Hex or 8mm Allen Key –Drain Plug
- 5mm Hex or 5mm Allen Key –Fill Plug
- 10mm deep socket – pump bolts
- 3/8″ Torque Wrench
- ¼” Torque Wrench
- Syringe into the fill port
- Diagnostic Tool – VCDS / VAGCOM / ODIS & VAS TOOL / Other tool Capable of reading the oil temperature in the Haldex Coupling
Diagnostic Guide for Checking Oil Temperature for Gen5 Haldex:
Using your diagnostic machine, you can check the Temperature of the Oil in the Haldex Coupling:
- Connect Vehicle Diagnostic Testing Machine
- Select – Running gear Group 01; 40…49
- Select – Four-wheel drive with Haldex coupling
- Select – 01 – Self-diagnosis-capable system
- Select – Four-wheel drive Haldex
- Select – Electrical components
- Select – Oil temperature
- The oil temperature must be between 20 and 40 °C before you empty the oil from the Haldex Coupling
Top Tip – the oil will be close to the correct temperate if the vehicle has been driven/idling before you start the process
Procedure for Emptying the Haldex Coupling Oil:
Once you have checked the oil is at the correct temperature with your diagnostic tool, you can now start the process of emptying the oil from the Haldex Coupling.
- Make sure the vehicle is level and safely placed on your ramp
- Remove Fill Plug (5mm Hex/Allen) (1)
- Place Oil catch under the oil drain plug (8mm Hex/Allen) and remove (2)
- Allow the entire contents to empty (Dispose any oil legally and be environmentally friendly)
Removing a GEN 5 Haldex Pump & cleaning the strainer basket / gauze:
The GEN 5 Haldex pump is fitted with a Strainer Basket/Gauze that often becomes clogged and leads to the pump failing. As part of our general service, we will always remove the strainer and clean it.
- Using a 10mm socket remove the Haldex Controller Bolts (located behind the controller)
- Remove right hand electrical plug (use a pick/small flat to lift tab and remove safely) (C)
- Remove the plastic wire guide (use fingers to follow the wire and pull out)
- Using a 10mm deep socket remove the pump bolts
- Using a large flathead screwdriver gently split the pump from the coupling where there is a slight tab to insert and rotate
- Remove pump
- Clean area inside where the pump sits (normally some debris stacked up)
- Using a T10 remove the strainer basket/gauze screws
- Use some brake cleaner to help remove the build-up of debris
- Make sure all debris is removed from the top of the pump
- Use new seals, crush washers or bolts and replace the pump
- New 10mm pre-charge pump bolts need to be replaced to a torque setting of 9.5nm
Note: The pump when removed loses some oil, therefore you will be required to undertake the pump relearn process using your diagnostic tool. This will prime the pump and therefore allow the evacuated space to be filled with fresh oil.
Filling the GEN 5 Haldex Coupling with Oil:
This is quite a simple process when using the right tools for the job.
- Replace 8mm Hex Drain Plug + new crush washer – 32nm torque (2)
- Use syringe to suck up around 650-700ml of your Haldex Oil (VAG-G060175A2)
- Insert the fill tube into the fill plug and make sure there is a slight gap so you will be able to monitor when the hole starts to overflow
- Pump contents into fill hole until the overflow drips with oil (1)
- Replace the 5mm fill plug + new crush washer to a torque setting of 15nm (1)
How to perform a pump relearn on a GEN 5 Haldex:
Using your diagnostic tool:
- Select – 22 – AWD
- Select – Basic Settings – 04
- Use the drop-down menu and select – MAS02928 – Pump Motor
- Select – Go
- Once selected you should be able to hear the pump cycle itself for around 30 seconds to a minute while it relearns its cycles.
- When the process is completed, you should see a message advising – finished correctly
| Fault Code | Possible Cause | Solution |
|---|---|---|
| P 131599 – All Wheel Drive Clutch – U0114 00 [009] – No Communication | Haldex Controller Faulty | Repair Haldex Controller |
| P 131599 – Control Module for All Wheel Drive Clutch – C1113 07 Intermittent error | Haldex Controller Faulty | Repair Haldex Controller |
| P 16670 – All-Wheel Drive – C1113 07 [008] – Mechanical Failure | Pump Fault OR/AND Transfer box | Replace Pump / Replace Pump & Differential Unit |
| P 16671 – Pump for Haldex Clutch – C1112 04 [008] Internal System Fault | Pump Fault + Haldex Controller Faulty | Replace Pump / Repair Haldex Controller Unit |
| P 16671 – Haldex clutch pump Faulty – C1112 04 passive/sporadic | Pump Fault + Haldex Controller Faulty | Replace Pump / Repair Haldex Controller Unit |
| P 16668 – Pump for Haldex Clutch C1112 07 [008] – Mechanical Failure Intermittent | Pump Fault | Replace Pump |
| P 16666 – Pump for Haldex Clutch C1112 13 [008] – Open Circuit | Pump Fault | Replace Pump + Check Wiring |
| C111307 – Mechanical Malfunction – Passive / Sporadic | typically, blocked pump, clean out and relearn or possible transfer box fault | Replace Pump & Transfer Box & Differential Unit |
How to test if the Haldex Coupling is working
Once you have scanned the vehicles AWD for any fault codes you are now able to test if the coupling is engaging when the vehicle senses the front wheels slip.
To test the function of the GEN 5 Haldex Coupling follow the below instructions:
Testing the physical function of the Haldex will require either a rolling road or brake roller tester.
- With the front wheel on the rollers engage 1st gear / drive
- Rev the engine in gear until you 1500 rpm
- If the rear axle does not engage at this point and try to push the vehicle forwards. The Haldex Coupling is defective and further diagnosis will be required