Aller au contenu

P276F Modérée Générique / SAE

P276F: Moteur de la pompe à huile de boîte B — courant haut

WhatsApp Telegram X E-mail

Que faire

The car will drive normally — the most likely sign is that stop-start no longer switches the engine off. That is the system protecting itself rather than a battery problem, which is what usually gets blamed. You may also notice a slight delay before the car moves after the engine restarts. Worth diagnosing, not urgent.

Ce que signifie ce code

The electric auxiliary transmission fluid pump B motor current is high.

An automatic gearbox loses all its hydraulic pressure the moment the engine stops turning, and stop-start made that a problem worth solving.

The main pump is driven by the engine. Engine off, no pressure, no clutch applied — which is fine when the engine only stops at the end of a journey. On a car that shuts the engine off at every red light, the transmission would have to rebuild pressure before the car could move, and the delay is exactly the hesitation that makes people dislike stop-start.

So an electric auxiliary pump keeps pressure up while the engine is stopped, and lets the car pull away the instant the engine restarts. Hybrids need it for the same reason and more often. A fault here does not usually stop the car — it stops the stop-start, and many vehicles simply disable engine shutdown, which is the system failing safe.

High current means the motor is working against something — a seized or stiff pump, a blocked passage, or cold thick fluid. It is a mechanical finding rather than an electrical one, and a pump drawing too much is a pump on its way out.

What the driver notices is usually nothing, or that stop-start has stopped working. That is worth stating plainly, because an unexplained loss of stop-start is often blamed on the battery — and on a car with this code the transmission is the reason.

Pump B implies a pump A, so this is a vehicle with more than one auxiliary pump or one that numbers them for a second circuit. Read every stored code before assuming which unit is meant.

Transmission fluid is the first thing to check and the thing most often skipped.

It is not a lubricant that also happens to move things — it is the working fluid of a hydraulic machine. It carries the pressure that applies every clutch, it carries the heat away, it lubricates, and it is the friction surface itself: the additive package is tuned so clutches grip smoothly rather than snatching.

So fluid that is low, old, burnt or of the wrong specification changes how the transmission behaves, and it does so before any part has failed. Burnt fluid smells burnt and looks dark; healthy fluid is translucent. Checking it costs nothing and rules out a great deal.

"Filled for life" is a claim about the warranty, not the transmission. Many sealed units have no dipstick and a manufacturer schedule that never changes the fluid, and they still wear out faster on original fluid than on serviced fluid.

Causes probables

Commencez ici

Moins fréquent

Symptômes

Composants concernés

Des informations, pas des instructions

CarGeek est un ouvrage de référence, pas un manuel d'atelier. Ses pages sont rédigées à partir de sources publiques et de ce que d'autres ont constaté, jamais à partir de la documentation technique du constructeur ; elles peuvent donc être erronées ou incomplètes pour votre véhicule précis. Une partie de ce qu'elles décrivent présente un risque réel : haute tension, carburant sous pression, énergie accumulée, pièces chaudes ou en mouvement.

Avant d'agir sur quoi que ce soit, faites-le vérifier par une personne formée, en suivant la procédure du constructeur pour votre véhicule. Rien ici ne remplace cette procédure.

Expérience de la communauté

Soyez le premier à en faire le compte rendu

Rien n'a encore été publié à ce sujet. Tout ce que vous avez trouvé mérite d'être noté — même une impasse épargne à quelqu'un le même après-midi.

Ce qui rend un compte rendu utile :

  • La voiture — marque, modèle, année et moteur. La même panne ne se comporte pas pareil sur chacune.
  • Ce que vous avez mesuré, pas seulement ce que vous avez remplacé.
  • Ce qui a réellement résolu le problème — ou que rien ne l’a résolu, ce qui est utile aussi.

Se connecter ou créer un compte pour ajouter ce que vous avez trouvé à propos de P276F.