U0073
Sistema
Network (CAN Bus)
Scanner richiesto
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.

Sintomi comuni

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

Cause tipiche

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

Quale scanner ti serve?

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

Usa dati live e freeze frame prima di sostituire componenti. I codici ABS, SRS e U richiedono spesso uno scanner mult sistema.

Consigli diagnostici

  • Registra il freeze frame quando il codice compare la prima volta
  • Cancella il codice solo dopo aver risolto la causa
  • Controlla i codici pending correlati
  • Verifica che la batteria sia sopra 12,4 V prima di sospettare un sensore

Scanner FOXWELL consigliati

Domande frequenti

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.