C056D Code: Meaning, Causes, and Symptoms | OBD2 Codes

C056D – Electronic Control Unit Hardware

 

C056D Possible Symptoms

 

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

 

C056D Possible Causes

 

Faulty Electronic Control Unit,Electronic Control Unit harness is open or shorted,Electronic Control Unit circuit poor electrical connection

 

C056D Description

 

The internal fault detection is handled inside the control module. The symptom byte listed in the DTC Descriptor is for engineering reference only. No external circuit diagnosis is involved.