What are the ABS system fault codes?
3 Answers
ABS fault meaning: An ABS fault indicates a malfunction in the vehicle's anti-lock braking system. When an ABS fault occurs, the ABS warning light illuminates. During emergency braking, if the wheels lock up, the vehicle may lose control and skid, preventing the driver from slowing down or adjusting the vehicle's trajectory, which poses significant safety risks. It is recommended not to continue driving under such conditions; instead, the fault should be resolved before resuming operation. Driving with an illuminated ABS system fault is not advisable because an ABS system fault means the vehicle's anti-lock braking system is malfunctioning. During emergency braking, if the wheels lock up, the vehicle may lose control and skid, making it difficult for the driver to slow down or adjust the vehicle's path, which presents substantial safety hazards. Where is the ABS sensor located in the car? The ABS sensor is positioned on the inner side of the car's tires and can be seen when the vehicle is lifted. There are three types of ABS sensors: linear wheel speed sensors, ring-type wheel speed sensors, and Hall-effect wheel speed sensors.
Last time my car's ABS light came on, and a bunch of trouble codes gave me a headache. The most common issue is the wheel speed sensor problem—codes like C0110 and C0245 usually mean the sensor is clogged with mud or the wiring got chewed by rodents. When the steering wheel shakes, a C0121 code typically indicates the sensor gap is too large; just remove the wheel and adjust it. More troublesome is something like C0265, a control module fault—I saved over 3,000 by replacing it with a used part. My advice: after reading the OBD codes, don’t rush to clear them. First, note down the codes and search for repair solutions for your specific model on forums—many minor issues can be fixed yourself.
Over the years of running the repair shop, I've seen too many ABS trouble codes. C0110 usually means the left front wheel sensor is dirty—just clean the dust off. C0130 might indicate a loose sensor connection. Be cautious with C0260, which points to control valve issues; if unfixable, the entire pump may need replacement. C1214 signifies a burnt relay, easily solved for a few dozen bucks. Don't ignore C0270, a motor fault code—minor cases cause braking deviation, while severe ones lead to emergency brake failure. Permanent trouble codes always require oscilloscope signal testing, occasionally revealing hidden issues like damaged bearing magnetic rings.
