U0141: Kommunikationsverlust mit dem Bordnetzsteuergerät A
Was zu tun ist
Expect a whole group of things in one part of the car to have stopped at once — lights, locks, windows, wipers, interior lighting.
Modern cars split their electrics between several computers, each looking after one area. This code means one of them has stopped talking to the rest of the car, so everything it controls has gone quiet together.
The good news is where that points. Each of these computers usually sits next to its own fuse box, so one blown fuse or one failed relay can take out the computer and its whole area in one go. That is far commoner than a failed module and enormously cheaper. Ask for the fuses and relays nearest the dead area to be checked first.
If a fuse blows again straight away, that is information rather than an annoyance — something in that area is shorting, and it needs finding. Never let anyone fit a bigger fuse to stop it blowing. That is how a wiring fault turns into a fire.
And check your carpets. These computers live inside the cabin, so a blocked drain, a leaking heater or a perished windscreen seal puts water straight onto them — damp carpets and odd electrics are usually the same fault.
Before driving at night, check your lights, indicators and brake lights are all working.
Was dieser Code bedeutet
A body control module has stopped being heard from. The general reasoning is at U0100, U0140 covers the unlettered entry, and U0443 explains why these modules are lettered at all — they are zones rather than ranks, and roughly where each one lives determines how it fails.
Silence has one property bad data does not, and it is the most useful thing on this page: a zone module that goes quiet takes everything at that location with it, all at once.
Which turns the diagnosis into a question about power rather than about data. Each zone module normally sits beside its own fuse box — that is the point of putting it there, so that the fuses feeding the lamps, motors and heaters it operates are local too. So one failed supply can take out the module and its whole zone in a single stroke.
That gives a free first check that is right far more often than it deserves to be: the fuses and relays in the box nearest the dead area. A whole corner of the vehicle going dark at once is much likelier to be a supply than a module, and a module is expensive while a fuse is not.
The second check is what the fuse blew for. A fuse that fails again immediately is reporting a short somewhere in the zone — a chafed wire in a door, a lamp holder full of water, a trapped harness — and fitting a larger fuse in response is how a wiring fault becomes a fire.
And the U0140 argument applies unchanged: check the carpets. These modules sit in the cabin, in the path of a blocked bulkhead drain, a leaking heater matrix or a perished screen seal, and damp carpets with strange electrics are one fault far more often than two.
Wahrscheinliche Ursachen
Hier anfangen
Seltener
- Datenbusleitungen beschädigt · mittel
- Bordnetzsteuergerät defekt · Fachwerkstatt
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 U0141.