C1478 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1478 – Front Left Wheel Brake Pressure Control Plausibility Failure

 

C1478 Possible Symptoms

 

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

 

C1478 Possible Causes

 

Brake System Bleeding,Faulty Hydraulic Control Unit (HCU),Hydraulic Control Unit (HCU) harness is open or shorted,Hydraulic Control Unit (HCU) circuit poor electrical connection

 

C1478 Description

 

The Hydraulic Control Unit (HCU) monitors the Front Left Wheel Brake Pressure. The HCU sets the OBDII code when the Front Left Wheel Brake Pressure is not to factory specifications.