MasterTuning Fault code dictionary (DTC)

U0100 — Lost communication with the Motore control module

Severity: Serious Can you drive? With caution: limp mode possible, have it checked soon Produttore: Tutti makes (OBD-II standard)
MeaningThe Altri control units No longer receive Motore ECU messages on the CAN bus. This is a network code, not a mechanical one.
FamilyNetwork (U)

Typical symptoms

Several Attenzione lights together
Incomplete instrument display
Motore will not start
Automatico gearbox in emergency mode

Common causes

Interrupted ECU Potenza oppure earth
Blown fuse
Damaged CAN wiring
Very flat battery
Faulty ECU (Ultima hypothesis)

What a do

Check fuses, supplies and battery voltage before suspecting the ECU: in most cases the Problema is upstream and the unit itself is healthy.

Domande Frequenti

What does code U0100 mean?

Lost communication with the Motore control module. The Altri control units No longer receive engine ECU messages on the CAN bus. This is a network code, not a mechanical one.

Can I keep driving with code U0100 Attivo?

With caution: limp mode possible, have it checked soon

Common causes — U0100

Interrupted ECU Potenza oppure earth Blown fuse Damaged CAN wiring Very flat battery Faulty ECU (Ultima hypothesis)

How do you fix code U0100?

Check fuses, supplies and battery voltage before suspecting the ECU: in most cases the Problema is upstream and the unit itself is healthy.

Need Aiuto with this fault?

We are ECU specialists: diagnosis, file repair and remapping for Auto, bikes, Camion and Agricoli vehicles.

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