B0066 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0066 – Left Front/Driver Pretensioner Deployment Loop Voltage Out of Range


B0066 Possible Symptoms


Air Bag Warning Light ON


B0066 Possible Causes


Faulty Left Front/Driver Pretensioner,Left Front/Driver Pretensioner harness is open or shorted,Left Front/Driver Pretensioner circuit poor electrical connection,Faulty Sensing and Diagnostic Module (SDM)


B0066 Description


The driver seat belt pretensioner deployment loop consists of a seat belt pretensioner – LF and the seat belt pretensioner – LF high and low circuits. A shorting bar used within the seat belt pretensioner connector shorts together both the seat belt pretensioner high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the pretensioner during servicing. During a frontal crash of sufficient force the inflatable restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop in order to deploy the seat belt pretensioner. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in memory.