C15A4 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C15A4 – Steering Actuator Malfunction


C15A4 Possible Symptoms


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


C15A4 Possible Causes


Faulty Steering Actuator,Steering Actuator harness is open or shorted,Steering Actuator circuit poor electrical connection,Faulty Steering Control ECU


C15A4 Description


When the Variable Gear Ratio Steering (VGRS) system is normal, the steering actuator conducts current from the steering control ECU to the steering actuator solenoid to release the lock mechanism, enabling motor operation. The steering actuator does not operate under any of the following conditions: – The engine switch is off. – The motor in the actuator is locked by the lock mechanism to prevent rotation (fail-safe function). – The system is being protected from overheating (fail-safe function). If the steering control ECU detects a malfunction in the steering actuator lock mechanism or a motor rotation angle error, it will store this Diagnostic Trouble Code (DTC).