B1556 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1556 – Ignition Run/Start Circuit Open

 

B1556 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1556 Possible Causes

 

Faulty Ignition Switch,Ignition Switch harness is open or shorted,Ignition Switch circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B1556 Description

 

The Body Control Module (BCM) monitors the Ignition Switch. The BCM sets the OBDII code when the Ignition Switch is not to factory specifications.