When to Suspect a Vehicle Defect Caused Your Accident

The Bottom Line

If you were driving normally and suddenly lost control of your vehicle with no obvious explanation, a mechanical defect may have caused your crash -- not driver error. Red flags include sudden acceleration, brake failure, steering loss, tire blowouts on newer tires, seatbelt failures, and airbag malfunctions. NC product liability law allows you to hold the manufacturer liable, but these cases are complex, expensive, and require expert investigation. Preserve the vehicle, do not authorize repairs, and consult a product liability attorney.

Red Flags That Suggest a Vehicle Defect

Not every unexplained accident involves a defect. But certain patterns strongly suggest the vehicle -- not the driver -- was at fault.

Sudden Unintended Acceleration

You are driving at normal speed, and the vehicle suddenly accelerates on its own -- or the accelerator pedal does not respond when you try to lift your foot. This has been linked to defective electronic throttle control systems, sticky accelerator pedals, and floor mat interference. The GM ignition switch recall and Toyota sudden acceleration recalls involved exactly this type of failure.

Brake Failure Despite Regular Maintenance

You press the brake pedal and it goes to the floor, feels spongy, or does not slow the vehicle. If your brakes were recently serviced and in good condition, the failure may be caused by a defective master cylinder, brake line failure, or a flaw in the anti-lock braking system (ABS). Brake failure at highway speed is one of the most dangerous mechanical defects.

Loss of Steering Control

The steering wheel suddenly feels loose, pulls sharply in one direction, or stops responding entirely. This can result from defective power steering pumps, failed steering racks, broken tie rod ends, or electronic power steering system malfunctions. Some vehicles have been recalled for exactly this type of failure.

Tire Blowout on a Relatively New Tire

If a tire with adequate tread depth and proper inflation pressure blows out or experiences tread separation, the tire itself may be defective. This is especially suspicious if the tire is relatively new, was properly maintained, and there is no evidence of road hazard impact. Tread separation -- where the tread peels away from the tire carcass -- is a manufacturing defect, not a maintenance issue.

Seatbelt That Unlatched or Failed to Restrain

You were wearing your seatbelt, but it released during the crash, failed to lock against your body's forward motion, or the webbing tore. If the seatbelt did not do its job, you suffered the same injuries you would have sustained without a seatbelt -- and the seatbelt manufacturer is liable for the failure.

Airbag That Did Not Deploy -- or Deployed When It Should Not Have

In a moderate to severe frontal collision, the airbag should deploy. If it did not, the airbag system may have malfunctioned. Conversely, if the airbag deployed in a minor fender bender where deployment was not warranted, the sensor system may be defective. Either scenario is a potential product liability claim.

The "I Lost Control for No Reason" Scenario

This is one of the most telling situations. You were driving normally -- not distracted, not impaired, not speeding -- on a road you know well, in reasonable weather conditions. And suddenly you lost control. The car veered, the brakes did not work, the steering did not respond.

When there is no obvious explanation for a loss of control, a mechanical defect should be at the top of the investigation list. People tend to assume they must have done something wrong, but vehicles are complex machines with thousands of components, and any one of them can fail.

How to Investigate a Suspected Defect

Have an Independent Mechanic Inspect the Vehicle

The key word is independent -- not the dealer. The dealership has a relationship with the manufacturer and may not be the most objective party to evaluate whether a defect exists. An independent automotive mechanic or engineer can examine the brake system, steering components, throttle system, tires, and other potential failure points without a conflict of interest.

Preserve the Vehicle

Do not authorize repairs, do not let the insurance company send the vehicle to a salvage yard, and do not let anyone discard or replace parts. The vehicle itself is your most important evidence. If a defect caused your accident, an expert needs to examine the vehicle in its post-crash condition.

Download the Event Data Recorder (EDR) Data

Most modern vehicles have an event data recorder -- sometimes called a "black box" -- that records vehicle speed, brake application, throttle position, steering angle, and other data in the seconds before, during, and after a crash. This data can prove that you applied the brakes but they did not respond, or that the throttle was open when your foot was not on the accelerator. EDR data must be downloaded by a qualified technician with the right equipment before the vehicle is disposed of.

Check for Recalls and NHTSA Complaints

Search your vehicle's year, make, and model at NHTSA.gov/recalls for open recalls and at NHTSA.gov/complaints for consumer complaints. A pattern of similar failures reported by other owners is strong evidence that your vehicle has a known defect.

NC Product Liability Law: What You Need to Know

North Carolina recognizes several theories for product liability claims involving defective vehicles.

Manufacturing defects occur when one specific unit deviates from the intended design -- a bad weld, a contaminated batch of materials, an improperly machined component. NC applies strict liability to manufacturing defects. You need to prove the product was defective and the defect caused your injury. You do not need to prove the manufacturer was negligent.

Design defects occur when the design itself is unreasonably dangerous -- every unit has the same flaw. NC applies a negligence standard to design defects. You must prove the manufacturer knew or should have known the design was dangerous and that a safer alternative design existed.

Failure to warn applies when the manufacturer knew about a risk but did not adequately warn consumers. This can apply when a vehicle has a known tendency toward a specific type of failure and the manufacturer did not issue warnings or recalls.

The Manufacturer's Resources -- and Why This Is Not a DIY Claim

Car manufacturers are among the largest corporations in the world. When faced with a product liability claim, they deploy teams of engineers, metallurgists, accident reconstructionists, and experienced defense lawyers. They will examine your vehicle, your driving history, your maintenance records, and your phone records looking for any alternative explanation for the accident.

Fighting a product liability case against an automaker requires retaining your own engineering experts, accident reconstruction specialists, biomechanical experts, and potentially metallurgists or materials scientists. These cases routinely cost $50,000 to $500,000 or more in expert fees and litigation expenses before they ever reach a courtroom.

This is why product liability attorneys work on contingency -- they fund the case and only get paid if you win. But they are selective about which cases they accept, because the damages must justify the investment.

When It Is Probably NOT a Defect

Not every mechanical failure is a product defect. Some failures result from the owner's choices rather than the manufacturer's. Common non-defect causes include severely worn tires that were not replaced, neglected maintenance such as skipped brake inspections or fluid changes, aftermarket modifications that altered the vehicle's safety systems, and driver impairment or distraction at the time of the crash.

An honest investigation considers all possibilities. If the evidence points to a maintenance issue rather than a manufacturer defect, a product liability claim will not succeed -- and a reputable attorney will tell you that.

Frequently Asked Questions

Frequently Asked Questions

How do I know if a vehicle defect caused my accident?▾

Red flags include sudden unintended acceleration, brake failure despite regular maintenance, loss of steering control, tire blowout on a relatively new tire, a seatbelt that unlatched or failed to restrain you, and an airbag that either did not deploy or deployed when it should not have. If you were driving normally and suddenly lost control with no apparent explanation -- no distraction, no impairment, no adverse road conditions -- a mechanical defect should be investigated by an independent mechanic.

Should I have the dealer or an independent mechanic inspect my car after an accident?▾

Have an independent mechanic or automotive engineer inspect the vehicle -- not the dealer. The dealer has a relationship with the manufacturer and may not be objective, especially if a defect could trigger a product liability claim. An independent expert can provide an unbiased assessment of whether a mechanical failure contributed to the accident. If the expert identifies a defect, your attorney can retain a certified automotive engineer for formal analysis.

Can I handle a product liability claim against a car manufacturer on my own?▾

Realistically, no. Product liability cases against vehicle manufacturers require expert engineering testimony, accident reconstruction, biomechanical analysis, and often metallurgical testing. These cases cost tens of thousands to hundreds of thousands of dollars to litigate. Car manufacturers have teams of engineers and lawyers who defend these claims aggressively. A product liability attorney who works on contingency will fund these costs and has the experience to take on a manufacturer.

What if my car had a known defect but no recall was issued?▾

Not all defects result in recalls. Manufacturers sometimes resist issuing recalls, or NHTSA may still be investigating. Check the NHTSA complaints database at NHTSA.gov/complaints for reports from other owners of your vehicle's year, make, and model. A pattern of similar complaints -- even without a formal recall -- is evidence that the manufacturer knew or should have known about the defect. Your attorney can use NHTSA complaint data and internal manufacturer documents obtained through discovery to build your case.