This diagnostic trouble code indicates an intermittent or erratic signal from the left front wheel speed sensor circuit. It prevents the anti-lock braking system from accurately monitoring wheel speed on that corner. Consequently, stability and traction control features may be disabled.
Internal sensor failure due to heat, vibration, or age is the most common cause of intermittent signals.
Wires near the wheel well flex constantly and are prone to chafing, breaking, or heat damage.
Exposure to moisture and road salt can cause corrosion at the sensor or module connector pins.
Cracks, rust, or missing teeth on the reluctor ring attached to the hub can disrupt the signal.
Internal failure within the brake control module is possible but rare compared to sensor or wiring issues.
The vehicle is drivable, but anti-lock brakes and traction control will not function properly, increasing risk in slippery conditions.
No, this code is most commonly caused by the sensor or wiring, not the control module.
Yes, metal shavings or debris on the sensor magnet can cause erratic signals.
No, replacing the control module is rarely the correct fix and should only be considered after verifying all external components are functional.