Czujnik prędkości koła lewego przedniego — usterka obwodu
U1120
WysokiCommunication error of the ABS control module with other vehicle modules. The code indicates a loss or interference of the signal on the CAN bus network between the ABS controller and other control units.
OBD-II (EN): Lost Communication with ABS Control Module
Code U1120 indicates a loss of communication with the ABS control module on the vehicle's CAN bus network – this is a serious fault that can deactivate the ABS and ESP systems, put the car into limp mode, and limit driving safety. The most common causes are damaged connectors, breaks in the wiring harness, or failure of the ABS controller itself. Due to the impact on active safety systems, immediate diagnosis at a professional workshop is recommended.
Symptoms
Check Engine and/or ABS warning lights illuminated on the dashboard; activation of limp mode with limited maximum speed; lack of or delayed response to the accelerator pedal; problems starting the engine; incorrect operation of the ABS and ESP system (system may be completely deactivated); errors in automatic transmission operation; frozen data frames (Freeze Frame) and incomplete OBD readiness monitor tests stored in the ECU memory.
Possible causes
• Damaged or corroded CAN bus wiring harness connecting the ABS module to other controllers • Damaged electrical connectors – broken, bent, pushed-out, or corroded pins in the ABS module plugs • Malfunction of the ABS control module itself (internal hardware or software failure) • Interference on the CAN bus network caused by another faulty module connected to the bus • Blown fuse or open circuit in the power supply/ground of the ABS module • Damage to the CAN network terminators (120 Ω resistors at the ends of the bus)
Affected systems
Related codes
Usterka elektryczna cewki zaworu wylotowego ABS – prawy przedni. Moduł ABS wykrył nieprawidłowość w obwodzie sterującym prawego przedniego zaworu wylotowego układu przeciwblokującego.
Kod U1100 oznacza utratę komunikacji z modułem sterującym nadwozia (BCM) lub innym modułem w sieci CAN. Jest to kod specyficzny dla producenta, wskazujący na przerwanie wymiany danych w magistrali komunikacyjnej.
Czujnik prędkości koła prawego przedniego — usterka obwodu
Utrata komunikacji z modułem ABS
Utrata komunikacji z ECM (sterownik silnika)
Does code U1120 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.
