B144B Code: Meaning, Causes, and Symptoms | OBD2 Codes

B144B – Run/Crank Power Relay Circuit

 

B144B Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B144B Possible Causes

 

Faulty Run/Crank Power Relay,Run/Crank Power Relay harness is open or shorted,Run/Crank Power Relay circuit poor electrical connection,Faulty Body Control Module (BCM)

 

B144B Description

 

The Body Control Module (BCM) controls the ignition main relay through the control circuit by applying voltage to the ignition run/crank relay control circuit. The ignition main relay is energized when the ignition is in the ON, CRANK positions, or when a remote start is requested. The keyless entry control module controls the backup power for the ignition main relay through the control circuit by applying voltage to the ignition circuit. This circuit is a pass-thru in the BCM and will energize the ignition circuit when the vehicle is in the ON, CRANK positions or when a remote start is requested.