U0073
Système
Network (CAN Bus)
Scanner requis
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Control Module Communication Bus Off

Understand U0073, common causes, and the right FOXWELL scanner to diagnose it.

The CAN bus is offline — no module communication. Often wiring, termination, or a module shorting the bus.

Symptômes courants

  • Multiple warning lights
  • No-start
  • Gauges dead
  • Many U-codes at once

Causes typiques

  • CAN wiring damage
  • Failed module pulling bus down
  • Corrosion in DLC or junction connectors
  • Aftermarket device on OBD port

Quel scanner choisir ?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Utilisez les données en direct et le freeze frame avant de remplacer des pièces. Les codes ABS, SRS et U nécessitent souvent un scanner mult systèmes.

Conseils de diagnostic

  • Enregistrez le freeze frame lors de la première apparition du code
  • Effacez le code uniquement après avoir corrigé la cause
  • Vérifiez les codes en attente associés
  • Vérifiez que la batterie est au-dessus de 12,4 V avant de suspecter un capteur

Scanners FOXWELL recommandés

Questions fréquentes

Can I diagnose U0073 with a basic code reader?
U0073 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with U0073?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.