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Known fault

4Motion Haldex: the pre-charge pump blocks up

It does not show up on every car. Check before you buy.

expensive

severity

not available

mileage

2

sources

2 sources next to the write-up.

The fault

How you spot it

The Haldex clutch engages the rear axle when the front wheels slip. The pre-charge pump blocks up with oil sludge, and the rear axle simply gets no drive: the car appears to run faultlessly as long as grip is good. The telltale sign is the front wheels spinning while the rears stand still. The same unit sits in the Tiguan I and the Passat B8 4Motion. The fourth generation Haldex, built up to October 2013, has a replaceable filter; the fifth generation after it does not, and there the oil change is the maintenance. Prevention is cheap, the consequence is not: replacing a neglected unit is a major expense.

Which model

Who it affects

The card opens the generation, the engine or the transmission.

Generations and models

2 generations.

Checklist

4Motion Haldex: the pre-charge pump blocks up

What you would check for this fault. Take it to the car.

Before you buy

Checklist

What you tick stays on this device only.

vinkodex.com · Before you buy it, see what can go wrong.

Sources

How we know

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms