Four-Wheel Drive Clutch Control Module

Controls the on-demand coupling that decides how much torque reaches the secondary axle — the arrangement used where four-wheel drive is variable rather than selectable. It reports how much clamping it is applying, the clutch temperature, and whether it can act at all.

Its failure default is the opposite of what people expect: it releases. A coupling that cannot be verified is disengaged, so the vehicle reverts to front- or rear-wheel drive only. That is the right choice — an unpredictably engaging coupling would be far worse — but it means a four-wheel-drive vehicle that quietly is not one any more.

And nothing about it feels different on dry tarmac. The difference appears pulling out onto a wet road, on snow, or on a slippery slope — which is why a driver who does not know should be told.

One behaviour is not a fault at all: these couplings overheat if worked hard — sustained wheelspin, towing, repeated hill starts on grass — and protect themselves by disengaging until they cool. A vehicle that lost four-wheel drive during exactly that use and recovered later was behaving correctly.

The unit sits at the rear axle, so its wiring and connectors take road spray, salt and impact.

Also known as: awd clutch module, haldex controller, 4wd coupling module, on-demand coupling module, awd control module

Referenced by 14 codes

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Codes involving this component (14)

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Information, not instruction

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