B1865 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1865 – Battery Power Supply ECU Circuit Open

 

B1865 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1865 Possible Causes

 

Faulty Battery Power Supply ECU,Battery Power Supply ECU harness is open or shorted,Battery Power Supply ECU circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B1865 Description

 

The Body Control Module (BCM) monitors the Battery Power Supply ECU. The BCM sets the OBDII code when the Battery Power Supply ECU is not to factory specifications.