B0051
Deployment Commanded — No Faults Present
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Code B0051 is a latched deployment code that indicates the airbag control module successfully commanded the deployment of one or more restraint devices (airbags, seatbelt pretensioners) during a crash event, and no electrical faults were present in the system at the time. This is not a malfunction code — it is a record that the SRS system performed as designed during a collision.
This code cannot be cleared with a scan tool. It is permanently stored in the airbag control module's memory to provide a record of the crash event. Once this code is set, the airbag control module must be replaced — it cannot be reused or reset. All deployed airbag modules, fired seatbelt pretensioners, and impact sensors must also be replaced according to the manufacturer's service procedures.
If you are purchasing a used vehicle and this code appears during a pre-purchase inspection, it indicates the vehicle was involved in a collision severe enough to trigger airbag deployment. The vehicle should be thoroughly inspected by a collision repair specialist to ensure all SRS components were properly replaced and the structural integrity of the vehicle was restored. Cutting corners on SRS repair after a collision is extremely dangerous and may result in airbags that fail to deploy — or deploy improperly — in a subsequent crash.
Severity
Symptoms
- •Airbag warning light permanently illuminated
- •One or more airbags have visibly deployed (deflated bags visible)
- •Seatbelt pretensioners may have fired and locked
- •Vehicle may have significant collision damage
- •SRS system is fully disabled and will not function in a subsequent collision
Likely Causes
This is the most common and expected cause. The code is set when the airbag control module successfully commanded deployment of one or more restraint devices during a crash, with no electrical faults detected in the system at the time of deployment.
Even in cases where airbag deployment may not have been visible (e.g., seatbelt pretensioners only), the control module records the crash event and sets this latched code to indicate the system functioned as designed.
In extremely rare cases, an internal module fault can cause an erroneous deployment command. This is very uncommon in modern vehicles due to redundant safety checks.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace all deployed airbag modules (frontal, side, curtain as applicable)
- Replace the airbag control module (this code is latched and cannot be cleared)
- Replace fired seatbelt pretensioners
- Replace impact sensors as required by manufacturer service procedures
- Have the entire SRS system inspected and verified by a qualified technician