Code
B0051
HUMMER
B — Body
Deployment Commanded
AI status
Completed
Completed
100%
Causes
- Actual collision event that triggered deployment
- Airbag or seatbelt pretensioner deployment
- Short or open in squib/deployment circuit
- SRS control module internal fault or memory indicating commanded deployment
- Damaged or corroded wiring/connectors to airbag inflators or crash sensors
- Water intrusion or physical damage to SRS components
Symptoms
- Airbag warning light illuminated or flashing
- Possible deployment of one or more airbags and/or pretensioners
- SRS system disabled (no further deployments until repaired)
- Vehicle may have stored multiple related SRS fault codes
- Occupant protection features not functioning properly until repaired
What to check
- Use a capable scan tool to read all SRS codes and view freeze frame/crash data
- Visually inspect frontal and side airbag modules and pretensioners for signs of deployment or damage
- Inspect wiring harnesses and connectors between sensors/inflators and SRS module for damage, corrosion, or loose connections
- Verify battery voltage and ground integrity; low or intermittent power can corrupt SRS data
- Confirm whether any airbag or pretensioner has been replaced previously and was reinstalled/repaired properly
- Follow safe SRS procedures: disable system power per manufacturer instructions before doing hands-on inspection
Signal parameters
- Deployment Commanded flag (true/false) — from SRS module live data
- Freeze-frame: vehicle speed, ignition state, sensor inputs at time of event
- Number and identity of deployed inflators (flags recorded in module)
- Squib/infator circuit resistance (ohms) — compare to service specification
- Module voltage and ground measurements
- Crash sensor (accelerometer) raw/processed values and thresholds
Diagnostic algorithm
- Read codes and capture all SRS stored codes and freeze-frame data with a GM-capable scan tool. Save or print the crash/event data for records.
- Determine whether the code was set due to an actual deployment: inspect airbags, side curtain, driver/passenger modules and belt pretensioners for physical evidence of deployment.
- If deployment occurred, follow vehicle-specific post-deployment procedures: replace deployed inflators, pretensioners, and any damaged components, replace or reprogram the SRS control module per manufacturer instructions, and clear crash data only as allowed by service procedure.
- If no deployment occurred, perform a visual inspection of connectors and wiring between the SRS module, impact sensors, and inflators. Look for damaged insulation, chafing, corrosion, or poor pin engagement.
- Check battery condition and ground integrity. Repair any poor power/ground connections and retest.
- Using the service manual procedures and proper safety precautions, measure squib/infator circuit resistance at the connectors (do not short circuit squib). Compare measured values to service specification to identify open/shorted squib circuits.
- Test crash/impact sensor inputs using scan tool live data or bench test procedures in the service manual. Replace any sensor that provides values outside specification or exhibits intermittent behavior.
- If wiring and components check good but module still indicates a commanded deployment, suspect module internal fault or stored crash data. Follow manufacturer instructions: some modules must be replaced and programmed; some can be reset only under specific conditions.
- After repairs or replacements, reconnect battery, clear codes, and perform SRS system tests and readiness checks with the scan tool. Verify airbag lamp extinguishes and no new SRS DTCs are present.
- As a final step, document repairs and retained crash/event data per legal and safety requirements.
Likely causes
- Stored crash data from a recent impact (module recorded deployment command)
- Open or short in specific squib/deployment circuit (inflator or pretensioner)
- Deployed inflator detected (physical deployment confirmed)
- Faulty crash/impact sensor input falsely commanding deployment
- Corroded/damaged connector at inflator or SRS module causing false signal
- SRS module electrical failure or corrupted crash data/memory
Fault status
Status
SRS control module has recorded that a deployment command was issued. This indicates a commanded inflator/pretensioner discharge was detected or recorded. The airbag system may have deployed or the module detected conditions equivalent to a deployment command.
Repair difficulty: Hard
Diagnostic time: 2-6 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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