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How to Prove a Defective Airbag Caused Your Injuries After a Car Accident in California

Proving a defective airbag caused your injuries in California typically requires 3 pillars of evidence: crash data (EDR/ACM), medical causation proof, and product-defect documentation. Because airbags are regulated safety devices, a failure to deploy, improper deployment, or shrapnel/chemical release can create unique, traceable injury patterns. This article explains the evidence, experts, timelines, and California legal theories attorneys use to win these cases.

What Counts as a “Defective Airbag” in California?

In California, airbags can be “defective” in several ways, and the specific defect theory affects what you must prove. Most airbag cases fall into one (or more) of these categories:

1) Failure to deploy when it should have. The airbag does not deploy in a moderate-to-severe frontal or near-frontal crash where deployment would normally occur.

2) Improper or unexpected deployment. The airbag deploys in a low-speed impact, a side/rear impact where it should not deploy, or deploys late—after the occupant has already moved forward.

3) Over-aggressive deployment (excessive force). The inflator output, timing, or venting causes unusually severe facial, eye, chest, or upper-extremity trauma beyond what is expected for the crash severity.

4) Fragmentation or shrapnel events. Components inside the inflator rupture, sending metal fragments into the occupant compartment (a risk highlighted by the well-known Takata inflator recalls).

5) Chemical and burn injuries. Hot gases, talc, or propellants can cause burns or respiratory irritation in some malfunctions.

The Legal Standard: What You Must Prove to Link the Airbag to Your Injuries

A California defective airbag case usually involves two connected questions:

1) Is the airbag (or its system) defective?

Under California product-liability principles, manufacturers and others in the distribution chain can be liable for placing a defective product into the market. In practice, attorneys frame the defect as:

Design defect (the product was designed in an unreasonably dangerous way), manufacturing defect (something went wrong in production so the unit deviated from design), and/or failure to warn (inadequate warnings/instructions about known risks).

2) Did the defect cause or substantially contribute to the injuries?

Causation is often the battleground. You generally must show that the airbag defect was a substantial factor in causing your injuries—either by creating injuries that would not have occurred, or by making injuries significantly worse than they would have been with a properly functioning airbag system.

Step One: Preserve the Vehicle and Airbag Components (Without This, Your Case Can Collapse)

Airbag cases are evidence-sensitive. The most common defense is, “You can’t prove what happened because the evidence is gone.” California courts take evidence preservation seriously, and the destruction of key items can trigger “spoliation” arguments that harm a claim.

Send a spoliation/preservation letter immediately

Attorneys typically send written notice to:

• the towing yard/impound lot
• your insurer and the at-fault driver’s insurer
• any salvage auction or dismantler
• the vehicle manufacturer (and sometimes the airbag module supplier)

The letter should demand that the vehicle be preserved intact and not downloaded, repaired, dismantled, or destroyed until inspections occur.

Do not allow premature “total loss” disposal

Insurance companies often move quickly to declare vehicles a total loss and send them to salvage. In a defective airbag claim, that can be fatal. Your lawyer will typically arrange secure storage and coordinate a joint inspection with defense experts so no one can claim evidence tampering.

Step Two: Secure the “Black Box” Evidence (EDR/ACM) and Airbag Control Data

Modern vehicles record crash information in an Event Data Recorder (EDR) and/or the Airbag Control Module (ACM). This data can be crucial to proving whether the airbag should have deployed and whether it deployed correctly.

What EDR/ACM data can show

Depending on make/model, downloads may capture:

• vehicle speed and braking before impact
• delta-V (change in velocity), a key crash severity metric
• seatbelt use status (sometimes)
• crash pulse and principal direction of force
• whether the system commanded deployment and which airbags fired
• timestamps related to deployment decisions

In a failure-to-deploy case, for example, the defense may argue the crash didn’t meet thresholds. EDR data can rebut that by showing a deploy-level delta-V and a frontal crash pulse consistent with deployment criteria.

Chain of custody matters

EDR evidence must be collected using proper tools and documented carefully. A clean chain of custody and a neutral download process reduce the risk of disputes about altered or incomplete data.

Step Three: Use Crash Reconstruction to Prove “Should Have Deployed” or “Deployed Wrong”

Airbag deployment decisions depend on crash dynamics—direction, severity, timing, and occupant position. A qualified accident reconstruction expert can integrate:

• scene measurements and photographs
• vehicle crush profiles and impact points
• EDR/ACM downloads
• damage compatibility between vehicles (or fixed objects)
• surveillance/video or witness accounts when available

Example: Failure to deploy in a frontal offset collision

Suppose a driver is hit near the front-left corner at an intersection. The manufacturer may claim it was “not frontal enough” for deployment. Reconstruction can quantify the principal direction of force and show that, despite an offset impact, the crash pulse met deploy criteria and the system’s non-deployment indicates a defect (sensor failure, algorithm issue, wiring fault, or module malfunction).

Step Four: Prove Medical Causation—Airbag Injuries Have Distinct Patterns

Even if you prove an airbag malfunction, you still must connect it to the injuries claimed. This is where treating physicians and medical experts matter.

Common injury patterns tied to airbag malfunctions

Over-aggressive or out-of-position deployment may be associated with:

• orbital fractures, retinal injury, or eye trauma
• nasal and maxillofacial fractures
• sternal fractures, rib fractures, pulmonary contusions
• upper extremity fractures/burns from steering wheel airbag

Inflator rupture/shrapnel cases can involve:

• penetrating wounds to face/neck/chest
• unusual laceration patterns inconsistent with glass cuts
• embedded metallic fragments visible on imaging

Chemical exposure/burns may present as:

• localized burns on forearms/face
• respiratory irritation shortly after deployment

What your medical proof should include

• ER records documenting immediate symptoms and visible injuries
• imaging (X-ray/CT/MRI) that dates trauma to the collision
• operative reports and photographs (when applicable)
• expert differential diagnosis explaining why the injury source is consistent with the airbag mechanism, not just “general crash forces”

Step Five: Identify the Defect Type and Lock in the Right Legal Theory

California product-liability claims in airbag cases often proceed under strict liability (no need to prove negligence in the traditional sense), alongside negligence and warranty theories where helpful. Attorneys typically plead multiple defect theories to match the evidence.

Manufacturing defect: “This unit deviated”

If the airbag module, inflator, wiring, or sensor was improperly assembled or contaminated, the argument is that this specific unit failed to perform as intended. Evidence may include:

• teardown inspection findings
• metallurgical analysis (fracture surfaces, corrosion, fatigue)
• lot/batch records and traceability (when obtainable)

Design defect: “Even when made correctly, it’s unsafe”

Design defect claims focus on systemic issues—like inflator designs prone to rupture under foreseeable conditions, or algorithms that misclassify certain crash pulses. Evidence can include:

• recall campaigns and service bulletins
• internal testing and validation records (obtained through discovery)
• similar-incident databases and prior lawsuits (where admissible)

Failure to warn: “They knew or should have known”

Where a manufacturer knew of deployment risks, inflator degradation, or the need for special inspection/maintenance intervals, inadequate warnings can become central—particularly when the vehicle was in a recall population or had known airbag system issues.

Recalls (Including Takata): How They Help—and Their Limits

A recall can be powerful evidence that a defect exists, but it does not automatically prove causation in your specific crash.

How recall evidence strengthens a case

• shows the defect is recognized and not speculative
• supports notice/knowledge for punitive-related discovery in some scenarios
• helps align your incident with known failure modes (e.g., inflator rupture risk increasing with age, heat, and humidity exposure)

What you still must prove

You generally still need to show:

• your vehicle’s airbag/inflator is within the affected population (by VIN/part number)
• the defect manifested in your crash (non-deploy, late deploy, rupture, etc.)
• the defect caused or worsened the injuries