U0533: Ungültige Daten vom Steuergerät A der seitlichen Hinderniserkennung empfangen
Was zu tun ist
The car drives normally, but assume your blind-spot warning is not working — and drive as though it is not there, because it is not.
Use your mirrors and look over your shoulder before changing lanes. The system is a supplement to that habit, and this code means it has stopped being reliable. Most cars will light a warning to say so, but not all do.
Mention two things to whoever looks at it. Has the rear bumper been off, or has the car had rear-end body repair? These sensors sit behind the bumper skin and their aiming matters — a bumper refitted slightly differently, or a sensor bracket bent, is a common cause. And is there a towbar, bike rack or aftermarket fitting at the back? Metal near a radar sensor changes what it sees, and that is a configuration issue rather than a fault.
Was dieser Code bedeutet
Side obstacle detection control module A is broadcasting data that cannot be accepted as true. See U0400 for what an invalid-data code is and why the module it names is usually the messenger rather than the culprit.
The letter is the part of this code that actually tells you something, and it is worth reading carefully.
The standard letters each instance of a repeated module — one per door, one per seat, one per window — so the letter narrows a whole-vehicle fault to one corner of the car before anybody lifts a trim panel. What the letter does not do is say which corner, because the mapping from letter to physical position is the manufacturer's to choose and it is not consistent between makes.
Only the vehicle's own documentation resolves the letter to a location. Guessing costs a stripped door card and proves nothing.
Two practical consequences. If several letters in the same family are stored together, the fault is upstream of all of them — a shared supply, a shared earth, or the bus itself — and chasing one door is wasted work. And if exactly one letter is stored, you have been handed the most valuable diagnostic fact available: the other instances are working, so everything they share is proven good.
Blind-spot monitoring usually runs on two radar sensors behind the rear bumper corners, and the letter tells you which side has stopped being trustworthy.
A radar sensor's aim is part of its calibration. It is mounted behind a plastic bumper skin at a precise angle, and the module knows what it should see when the car is moving straight. Anything that changes that geometry — a bumper refitted a few millimetres out, a bracket bent in a car park knock, rear-end accident repair — produces readings the module rejects, from a sensor that is working perfectly.
Metal near the sensor is the second cause and the most commonly missed. A towbar, a bike rack, a cycle carrier, even a heavily metallic aftermarket bumper protector reflects radar back into the sensor. A blind-spot fault that appeared when a towbar was fitted has explained itself.
The third is simple obstruction. Caked mud, snow or ice on the bumper skin over the sensor blinds it, and that is a wash rather than a repair.
The system fails quietly. Most cars warn that blind-spot monitoring is unavailable, but the failure mode people actually experience is a mirror indicator that no longer lights — which looks exactly like no car being there.
Wahrscheinliche Ursachen
Hier anfangen
- Radarsensor dejustiert · Fachwerkstatt
- Radarsensor durch Schmutz oder Schnee verdeckt · einfach
- Korrodierter oder loser Stecker · einfach
Seltener
- Zubehörteil verdeckt den Radarsensor · einfach
- Radarsensor nach Arbeiten an der Front nicht kalibriert · Fachwerkstatt
- Datenbusleitungen beschädigt · mittel
Symptome
Beteiligte Bauteile
Information, keine Handlungsanweisung
CarGeek ist ein Nachschlagewerk, kein Werkstatthandbuch. Die Seiten entstehen aus öffentlichen Quellen und aus dem, was andere festgestellt haben, nie aus den Serviceunterlagen des Herstellers; für Ihr konkretes Fahrzeug können sie daher falsch oder unvollständig sein. Ein Teil des Beschriebenen birgt echte Gefahren: Hochspannung, Kraftstoff unter Druck, gespeicherte Energie sowie heiße oder bewegte Teile.
Lassen Sie alles, wonach Sie handeln wollen, von einer fachlich geschulten Person anhand der herstellereigenen Vorgehensweise für Ihr Fahrzeug prüfen. Nichts hiervon ersetzt diese Vorgehensweise.
Erfahrungen der Community
Schreiben Sie den ersten Erfahrungsbericht dazu
Dazu wurde noch nichts veröffentlicht. Was immer Sie gefunden haben, ist es wert, aufgeschrieben zu werden — selbst eine Sackgasse erspart jemandem denselben Nachmittag.
Was einen Bericht lesenswert macht:
- Das Fahrzeug — Marke, Modell, Baujahr und Motor. Derselbe Fehler verhält sich auf jedem anders.
- Was Sie gemessen haben, nicht nur, was Sie getauscht haben.
- Was es tatsächlich behoben hat — oder dass nichts es behoben hat, was ebenso nützlich ist.
Anmelden oder ein Konto anlegen und eintragen, was Sie gefunden haben — zu U0533.