U0121Lost Communication With Anti-Lock Brake System (ABS) Control Module
Ecco cosa significa il codice di errore U0121, perché si verifica e cosa fare.
Sistema: Network / module communication
Evita di guidare — questo guasto può essere pericoloso o causare ulteriori danni. Fallo controllare subito.
Cosa significa U0121
A module on the communication network has stopped receiving messages from the ABS (anti-lock brake) control module. In practice, the car can no longer communicate with the system that manages anti-lock braking and usually traction/stability control. Normal braking generally still works, but the safety-assist features (ABS, traction control, stability control) are typically disabled. It is often caused by lost power to the ABS module or a network wiring problem.
Sintomi comuni
- ABS warning light on
- Traction control / stability control (ESC) light on
- Check engine light may be on
- ABS and stability features disabled
- Speedometer may be inaccurate or dead on some vehicles
Cause comuni
Elencate dalla più comune alla meno comune.
- 1Loss of power or ground to the ABS module (blown fuse, corroded connector)
- 2Damaged, broken, or shorted CAN bus wiring to the ABS module
- 3Corroded, loose, or backed-out connector pins at the ABS module
- 4Another module disrupting the communication bus
- 5Failed or faulty ABS control module
Cosa fare
Have this checked soon, because ABS, traction control, and stability control are likely disabled even though basic braking still works. Drive gently and allow extra stopping distance, especially in rain, ice, or hard braking, until it is repaired. A technician will check ABS module power, grounds, and the network wiring before replacing parts.
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Domande frequenti
Cosa significa il codice U0121?
A module on the communication network has stopped receiving messages from the ABS (anti-lock brake) control module. In practice, the car can no longer communicate with the system that manages anti-lock braking and usually traction/stability control. Normal braking generally still works, but the safety-assist features (ABS, traction control, stability control) are typically disabled. It is often caused by lost power to the ABS module or a network wiring problem.
Quali sono le cause del codice U0121?
Le cause più comuni sono: Loss of power or ground to the ABS module (blown fuse, corroded connector), Damaged, broken, or shorted CAN bus wiring to the ABS module, Corroded, loose, or backed-out connector pins at the ABS module, Another module disrupting the communication bus, Failed or faulty ABS control module.
È sicuro guidare con U0121?
Evita di guidare — questo guasto può essere pericoloso o causare ulteriori danni. Fallo controllare subito.
Come si risolve il codice U0121?
Have this checked soon, because ABS, traction control, and stability control are likely disabled even though basic braking still works. Drive gently and allow extra stopping distance, especially in rain, ice, or hard braking, until it is repaired. A technician will check ABS module power, grounds, and the network wiring before replacing parts.
Queste sono informazioni generali per aiutarti a capire il codice U0121, non un sostituto della diagnosi di un meccanico qualificato. Conferma sempre la causa prima di sostituire i componenti.
Le definizioni dei codici seguono l’elenco standardizzato OBD-II (SAE J2012). CarVinVin è indipendente e non è affiliata ad alcun produttore.