B0072 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0072 – Passenger Seatbelt Pretensioner ‘A’ Deployment Control


B0072 Possible Symptoms


Air Bag Warning Light ON


B0072 Possible Causes


Faulty Passenger Seatbelt Pretensioner,Passenger Seatbelt Pretensioner harness is open or shorted,Passenger Seatbelt Pretensioner circuit poor electrical connection,Faulty Restraints Control Module (RCM)


B0072 Description


The Restraints Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range, the RCM can set a Diagnostic Trouble Code (DTC). As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern. This test uses the process of elimination to diagnose each part of the deployment loop circuit including: – Wiring – Connections – Driver seatbelt anchor pretensioner – RCM