B0084 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0084 – Front End Sensor 2


B0084 Possible Symptoms


Air Bag Warning Light ON


B0084 Possible Causes


Faulty Front End Sensor 2,Front End Sensor 2 harness is open or shorted,Front End Sensor 2 circuit poor electrical connection,Faulty Inflatable Restraint Sensing and Diagnostic Module (SDM)


B0084 Description


The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a Diagnostic Trouble Code (DTC).