U0121Wysoki
Utrata komunikacji z modułem ABS
Komunikacja sieciowa
Sprawdź szczegóły →C1025
WysokiFault in the ABS hydraulic pump motor circuit. The controller has detected an abnormality in the operation or power supply of the ABS actuator pump.
OBD-II (EN): ABS Pump Motor Circuit Malfunction
Code C1025 signals a fault in the electrical circuit of the ABS pump motor – the heart of this safety system may not function correctly, disabling anti-lock braking. The cause may be a faulty relay, a wiring harness issue, or the pump motor itself. Due to the direct impact on braking effectiveness, diagnosis and repair should be entrusted to a qualified service center.
Symptoms
ABS and/or ESP warning light illuminated on the dashboard; deactivation of the anti-lock braking system (ABS) and traction control (TCS); lack of characteristic brake pedal pulsation during braking (ABS does not intervene); possible extended stopping distance on slippery surfaces; optionally, an abnormal sound (humming or lack of noise) from the ABS module during initialization after vehicle start.
Possible causes
• Faulty electric hydraulic pump motor in the ABS module (brush wear, winding short circuit) • Blown or damaged ABS pump relay • Open or short circuit in the electrical harness supplying the ABS pump • Oxidized or loose electrical connector at the ABS module • Damaged ABS controller (module) – EBCM/HECU • Low battery voltage causing insufficient pump power supply
Affected systems
ABS (Anti-lock Braking System)TCS (Traction Control System)ESP/ESC (Electronic Stability Control)Układ hydrauliczny hamulcówModuł HECU/EBCM
Related codes
C1035Wysoki
Nieprawidłowa wydajność porównawcza czujnika prędkości prawego tylnego koła. Moduł ABS wykrył istotną różnicę między odczytem czujnika prędkości prawego tylnego koła a pozostałymi czujnikami przy prędkości powyżej 40 km/h.
Podwozie
Sprawdź szczegóły →Does code C1025 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.