How Wheel Speed Sensors Malfunction Cause ABS System to Act Up in Your BMW

An advanced technology that significantly contributes to BMW's safety and handling during braking is the Anti-lock Braking System (ABS). At the heart of the ABS lies the wheel speed sensors, which play the crucial role of monitoring the wheel speed.

Malfunction in wheel speed crumbles the working mechanism of the whole system. Thus, it is essential to address the wheel speed sensor malfunction whenever you see the ABS warning light or the traction control light on the dashboard. Visit our shop near you for an accurate diagnosis and effective repair for your BMW.

Role of the Wheel Speed Sensor in BMW ABS

If you are driving on a slippery road or at a high speed and apply sudden brakes, the wheels would likely lock up, causing you to lose steering control and skid uncontrollably. The ABS prevents this wheel lockup, allowing you to maintain steering control and reduce stopping distance, which becomes extremely crucial in emergency situations.

Located at each wheel, the wheel sensors continuously monitor the rotational speed of the wheels and transmit the data to the ABS control module. ABS constantly analyzes this information, and whenever it detects one or more wheels are slowing down significantly faster than the others, indicating impending lockup, it rapidly modulates the brake pressure to that wheel. This modulation is a pulsating action, where the ABS rapidly engages and releases the brakes, sometimes multiple times per second, to prevent wheel lockup. This allows you to maintain steering control and stop your BMW safely during hard braking or on challenging surfaces.

Factors Behind Wheel Speed Sensors and ABS Systems Failure

Sensor Damage: Prolonged exposure to road debris, salt, and moisture can physically damage the sensors over time. Also, impacts from potholes or minor accidents damage the wheel speed sensor.

Wiring Issues: Due to age, environmental factors, or accidental damage, the wiring behind the connection between the sensors and ABS control module gets frayed, corroded, or disconnected. This hinders the ABS function.

Electronic Malfunctions: Damages to the electronic components within the ABS module affect the wheel speed sensor function. These electronic failures happen due to overheating, electrical surges, or simply because of age.

Contamination: As the wheel speed sensor stays exposed to the outside, over time, it accumulates dust and debris. This contamination interferes with the sensor's ability to accurately read wheel speed.

The ABS functions in BMW are controlled and monitored by an advanced on-board diagnostic module, which warns about any malfunction in the module with its corresponding warning light on the dashboard. When ABS or the wheel speed sensor malfunctions, the ABS warning light or the traction control light gets lit, indicating that you should visit a BMW specialist for proper diagnosis and repair.

On top of these, the BMW also exhibits signs such as braking instability, reduced braking performance, erratic speedometer readings, and unnecessary activation of ABS when the system is affected due to a wheel speed sensor malfunction.

Addressing wheel speed sensor and ABS Issues

If you are encountering the above malfunction signs with your BMW, then visit our auto service shop near you without any delay to preserve your BMW's performance and safety. Our expert technicians put your car through a detailed diagnosis and identify the origin and the underlying reasons behind your ABS malfunction. With the diagnosis result, we perform proper repairs, which could include;

Cleaning: If the sensor is simply filled with brake dust or debris, a thorough cleaning using a specialized brake cleaner resolves the issue.

Wiring Repair: If the wiring is damaged, the affected section is rewired, ensuring proper connections and insulation.

Sensor Replacement: If the sensor is damaged or malfunctioning, replacing it with a high-quality OEM-made or reputable aftermarket sensor is the best course of action.

ABS Module Replacement: When the damage stems from the ABS module or any of its components, the solution requires replacement of the module or its damaged component. This also requires reprogramming of the new module to match BMW's specific configuration after repairs.

On top of the repair methods, several preventative practices also preserve the speed wheel sensor and the ABS module by preventing the malfunction from taking place. These include regular brake inspection, brake fluid flush at scheduled service intervals, and addressing warning lights immediately. Visit our shop near you so that you can get the best maintenance services for your BMW.

We at Swedish Auto Service are one of the most sought-after auto repair and service for the entire Austin area. We specialize in looking after European cars like BMW, Infiniti, Lexus, Mercedes, Saab, Subaru, and Volvo.