Technician A says that wheel speed sensors are a highly probable cause of illuminated EBC warning lamps. Technician B says that using the diagnostic codes can help determine which wheel speed sensor or sensor circuit is at fault. Who is correct?

Both Technician A and Technician B are correct.

• Technician A: Wheel speed sensors are indeed a common cause of illuminated Electronic Brake Control (EBC) warning lamps. These sensors provide crucial input for the Anti-lock Braking System (ABS) and Electronic Stability Control (ESC) systems, and if they fail or experience issues, it can trigger a warning light.
• Technician B: Using diagnostic codes is a standard and effective approach to identify issues with wheel speed sensors or their circuits. Modern vehicles are equipped with On-Board Diagnostics (OBD) systems that can store trouble codes related to various components, including the ABS system. By retrieving these diagnostic codes, technicians can pinpoint the specific wheel speed sensor or sensor circuit that is causing the problem, facilitating a more efficient and accurate diagnosis.

In summary, when dealing with an illuminated EBC warning lamp, it is a good practice for technicians to consider wheel speed sensors as a potential cause, and using diagnostic codes can help identify the specific issue within the ABS system.