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C001D Mittel Generisch / SAE

C001D: Auslassansteuerung hinten rechts

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Was zu tun ist

Your ordinary brakes still work — this is the anti-lock assistance switching off, not the brakes failing. Stopping distances get longer on slippery surfaces and the wheels can lock under hard braking, which also takes away your steering while you brake. Leave more room, brake earlier, and take extra care in rain, snow or on gravel. Have it looked at soon; in most countries the car will fail its roadworthiness test with this light on.

Was dieser Code bedeutet

The right rear outlet valve control circuit has a fault.

How ABS actually works, because the codes in this range name its parts.

A wheel speed sensor at each corner tells the module how fast that wheel is turning. When one decelerates far faster than the others under braking, it is about to lock. The module then does three things in sequence, many times a second: it isolates that wheel by closing an inlet valve so no more pressure can reach it, it dumps pressure by opening an outlet valve, and then it rebuilds pressure using the pump. That cycle is the shudder you feel through the pedal.

Every element of that loop has its own code here, which is what makes this range diagnosable rather than a single "ABS fault" — the valves at C0010 onward, the pump at C0020, the sensors at C0030 onward.

The outlet valve is the dumping one. It is closed in normal driving, and ABS opens it to bleed pressure out of this wheel into a low-pressure accumulator so the wheel can start turning again. A fault here means the module can stop pressure rising but cannot make it fall, which is the half of the cycle that actually prevents the lock-up.

Both valves are inside the hydraulic modulator and are not separately serviceable on most vehicles, so a genuine valve failure means the modulator assembly. Check the wiring and the connector first — the modulator is expensive and its harness lives in the engine bay taking heat, vibration and salt.

The most important thing first: the car still stops.

ABS, traction control and stability control are all additions to a braking system that works without them. When the module finds a fault it switches itself off and hands back a conventional, fully hydraulic brake system — the pedal, the master cylinder, the lines and the calipers are untouched. You have not lost your brakes.

What you have lost is the help. Without ABS the wheels can lock under hard braking, which lengthens the stopping distance on a slippery surface and — the part people forget — takes away your ability to steer while braking hard, because a locked wheel cannot generate cornering force. Without stability control the car will not catch a slide for you.

So drive it, but drive it as though it were forty years old: brake earlier, leave more room, and be especially careful in rain, snow and on gravel.

Wahrscheinliche Ursachen

Hier anfangen

Seltener

Symptome

Beteiligte Bauteile

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