C0035Wysoki
Czujnik prędkości koła lewego przedniego — usterka obwodu
Podwozie
Sprawdź szczegóły →C0420
WysokiWheel speed sensor circuit fault (rear left or rear axle) – ABS/ESC system. The code indicates an incorrect signal or open circuit in the electrical circuit of the wheel speed sensor associated with the ABS brake system.
OBD-II (EN): Left Rear Wheel Speed Sensor Circuit Malfunction
Code C0420 signals a problem with the wheel speed sensor or its electrical circuit, causing the deactivation of the ABS and traction control systems. The cause could be a damaged sensor, a broken cable, or a contaminated pulse ring. Due to the direct impact on braking effectiveness, the vehicle should be taken to a workshop for diagnosis as soon as possible.
Symptoms
Illumination of the ABS warning light on the dashboard; deactivation of the traction control (TCS/ASR) and/or stability control (ESC/ESP) systems; possible lack of ABS system response during hard braking; in some vehicles, activation of the CHECK ENGINE light or a brake system warning.
Possible causes
• Damaged or contaminated wheel speed sensor (Hall or inductive sensor) • Damaged sensor wiring or connector (open circuit, short circuit, corrosion) • Damaged or contaminated pulse ring (reluctor/ton-ring) – scratches, cracks, accumulated metallic debris • ABS/ESC module failure (less common) • Excessive wheel hub bearing play affecting signal reading
Affected systems
ABS (Anti-lock Braking System)ESC/ESP (Electronic Stability Control)TCS/ASR (Traction Control System)Układ hamulcowyModuł sterujący ABS/ESC
Related codes
C0040Wysoki
Czujnik prędkości koła prawego przedniego — usterka obwodu
Podwozie
Sprawdź szczegóły →U0121Wysoki
Utrata komunikacji z modułem ABS
Komunikacja sieciowa
Sprawdź szczegóły →Suggested Hybspec services
Based on the systems affected by this code, we will most likely start with:
Sources and further reading
Does code C0420 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.