C1406 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1406 – Open Or Short In Front Speed Sensor Left Circuit

 

C1406 Possible Symptoms

 

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

 

C1406 Possible Causes

 

Faulty Front Speed Sensor Left,Front Speed Sensor Left harness is open or shorted,Front Speed Sensor Left circuit poor electrical connection,Faulty Skid Control ECU

 

C1406 Description

 

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU. These signals are used for brake control. The speed sensor rotors have rows of alternating N and S magnetic poles and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the Skid Control ECU.