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What Is Sudden Unintended Acceleration? Risk, Legal Options & Next Steps

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Content Legally Reviewed By in-sg-matt-conner-img Matt Conner

Sudden unintended acceleration (SUA) is when a vehicle speeds up without the driver pressing the gas. It is usually caused by electronic throttle faults, stuck pedals, brake-override failures, or software bugs. If it happens, brake firmly, shift to neutral, then turn off the ignition once slowed. Drivers injured by a defect may have a product liability claim. In Washington, the deadline to file is generally three years.

Imagine driving down the highway at a steady pace when, without warning, your car surges forward uncontrollably. Your heart races as you struggle to regain control, but the vehicle seems to have a mind of its own. This terrifying experience, known as sudden unintended acceleration (SUA), has led to numerous accidents, injuries, and even fatalities.

Understanding the causes and legal options helps victims seek justice and potentially prevent future incidents.

Understanding Unintended Acceleration

Sudden unintended acceleration (SUA) occurs when a vehicle accelerates independently without driver input. This defect leads to dangerous, high-speed crashes, putting drivers, passengers, and pedestrians at serious risk.

SUA is often linked to electronic malfunctions, mechanical failures, or pedal misapplication. Regardless of the cause, victims of SUA-related accidents may have legal options to hold manufacturers or other responsible parties accountable.

Causes and Risks of SUA

Learning the origin of SUA may help you spot potential issues before they cause an accident. The most common issues resulting in SUA include the following:

  • Electronic throttle control (ETC) malfunctions. Modern vehicles use electronic rather than mechanical throttle systems, which sometimes fail due to software glitches or sensor malfunctions.
  • Stuck or jammed accelerator pedals. Defective pedals get trapped due to design flaws, floor mats, or mechanical failures.
  • Brake system failures. In rare cases, the braking system fails to override the acceleration, leading to loss of vehicle control.
  • Software and firmware bugs. Some cases of SUA have been linked to programming errors in in-vehicle computers, which affect throttle response.
  • Mechanical wear and tear. Older vehicles with worn-out components may develop throttle or pedal issues contributing to unintended acceleration.

The risks associated with SUA include high-speed collisions, severe injuries, and fatalities. Victims may experience broken bones, spinal injuries, traumatic brain injuries, or emotional distress following an SUA-related crash. Additionally, the financial burden of medical bills, vehicle repairs, and lost wages can be overwhelming.

Legal Recourse for SUA Victims

If your car accelerates on its own while driving and causes an accident, you may have legal grounds to seek compensation. Potential legal actions include:

  • Product liability claims. Product liability claims seek to hold vehicle manufacturers accountable for defects that led to unintended acceleration. Succeeding in a lawsuit requires proving design flaws, manufacturing defects, or failure to warn consumers about known risks.
  • Negligence claims. If a mechanic or dealership fails to address a known issue with your vehicle, they might be liable for failing to maintain or repair it properly.
  • Wrongful death claims. Families of deceased victims may pursue compensation for loss of life, funeral expenses, and emotional suffering, ensuring that negligent parties are held accountable.
  • Class action lawsuits. In cases where multiple drivers have experienced SUA in the same vehicle model, a class action lawsuit may be an option to hold manufacturers accountable. These lawsuits bring widespread attention to the issue and push for necessary recalls and safety changes.

A car accident lawyer experienced in vehicle defect cases assesses your claim and determines the best legal strategy. Compensation in SUA cases may include medical expenses, lost income, and pain and suffering.

If it is happening right now

How to Regain Control During Sudden Acceleration


If your vehicle is accelerating on its own, stay calm and work through these five steps in order.

01

Press the brake firmly

Apply steady, hard pressure with both feet if needed. Do not pump the brakes, as that can reduce braking power in many systems.

02

Shift to neutral

Move the gear selector to neutral. This disengages the engine from the wheels so the car can slow down even if the throttle is stuck.

03

Turn off the ignition when safe

Once you have slowed, switch off the ignition. With a traditional key, do not remove it while moving, since that can lock the steering wheel.

04

Steer to safety

Guide the vehicle to the shoulder or side of the road and bring it to a complete stop, using your hazard lights to warn other drivers.

05

Report the incident

Notify your dealership and the National Highway Traffic Safety Administration. Preserve the vehicle and document everything for any future claim.

Step 1 of 5
Understanding the defect

What Causes Sudden Unintended Acceleration?


Tap each cause to see how it can make a vehicle speed up without driver input. Identifying the source often points to who can be held liable.

Most modern vehicles use electronic rather than mechanical throttles. Software glitches or faulty sensors can send a false signal that opens the throttle without any input from the driver.

A pedal can become trapped by a design flaw, a shifted floor mat, or a mechanical failure, holding the throttle open even after the driver lifts their foot.

In rare cases the braking system fails to override the acceleration, leaving the driver unable to slow or stop the vehicle and quickly losing control.

Programming errors in a vehicle’s onboard computers have been linked to abnormal throttle response, particularly as cars rely more heavily on drive-by-wire systems.

Older vehicles with worn throttle or pedal components can develop faults over time that contribute to unintended acceleration.

Free case evaluation

Do You Have a Sudden Acceleration Injury Claim?


Answer three quick questions to see whether you may have grounds for a claim. This tool is informational and is not legal advice.

Question 1 of 3

Did your vehicle accelerate without you pressing the gas pedal?

Question 2 of 3

Did the incident lead to a crash, injury, or property damage?

Question 3 of 3

Did this happen in Washington within the last three years?

You may have a claim worth discussing

Based on your answers, your situation has the hallmarks of a potential product liability or negligence claim. A free consultation can confirm your options and the deadline that applies to your case.


Proven results

Results in Vehicle and Defect Cases


Representative recoveries for people injured or killed in vehicle, defect, and wrongful death cases across Washington.

$26M+
Combined recoveries in vehicle, defect, and wrongful death cases
$5.5M
Largest crash-injury jury verdict (head-on with an impaired driver)
$4.5M
Wrongful death in a trucking collision
40+ Yrs
Fighting for injured Washington families

Past results do not guarantee future outcomes. Each case is unique and depends on its own facts.

Injured by a Vehicle That Accelerated on Its Own?

Brett McCandlis Brown & Conner has handled complex vehicle defect cases for decades. Consultations are free, and you pay no upfront fees.

How to Fix Sudden Unintended Acceleration

If you experience SUA, follow these immediate steps to regain control:

  • Press the brake firmly. Apply steady pressure without pumping the brakes.
  • Shift to neutral. This disengages the engine’s power from the wheels.
  • Turn off the ignition. If it is safe to do so, turn off the ignition. Avoid removing the key if your car has a traditional ignition, as it may lock the steering wheel.
  • Steer to safety. Move to the side of the road and come to a complete stop.
  • Report the incident. Inform your dealership and the National Highway Traffic Safety Administration (NHTSA) to help prevent future occurrences.

To fix sudden unintended acceleration, a qualified mechanic should inspect your vehicle’s throttle system, software, and braking components for a long-term solution. Regular vehicle maintenance, including software updates and recalls, also helps prevent SUA incidents.

Steps to Take After an SUA Accident

If you suffered harm in an accident caused by SUA, follow these steps to protect your rights:

  • Seek medical attention. Even if injuries seem minor, get evaluated by a healthcare professional.
  • Document the incident. Take photos of the accident scene, vehicle damage, and any injuries.
  • File a police report. Official documentation can strengthen your legal claim.
  • Preserve evidence. Do not repair or alter your vehicle until a professional examination is conducted.
  • Consult an attorney. An experienced attorney can guide you through the claims process and help you seek compensation.

Remembering these steps after experiencing such a scary event can be difficult. Working with an attorney can ensure proper handling of any missed steps after your accident. 

Seeking Legal Help After an SUA-Related Accident

Victims of SUA accidents deserve justice and compensation for their injuries, medical expenses, vehicle damage, lost wages, and emotional trauma. A knowledgeable attorney can undertake the following actions:

  • Investigate the cause of the acceleration defect, gathering expert analysis and vehicle black box data to prove liability;
  • Gather additional evidence such as recall records, repair history, and expert testimony;
  • Negotiate with insurance companies and manufacturers, ensuring those injured receive fair compensation rather than inadequate settlement offers;
  • Help you file a lawsuit within Washington’s statute of limitations for personal injury claims, ensuring that deadlines do not prevent you from seeking justice; and
  • Represent you in court if necessary, presenting a compelling case backed by technical evidence and legal acumen.

Taking prompt legal action can make a difference if you or a loved one has suffered due to unintended acceleration. Contact an experienced personal injury attorney to explore your options and secure the compensation you deserve. Don’t let auto manufacturers or negligent parties escape accountability.

Why Choose Brett McCandlis Brown & Conner?

Brett McCandlis Brown & Conner has a proven track record of handling complex vehicle defect cases. Our attorneys possess decades of experience advocating for victims of SUA-related accidents in personal injury and product liability cases.

We prioritize your needs and fight for your rights to help you recover the compensation you and your family need and deserve. We provide free consultations to learn more about your case. With no upfront fees, retaining our legal team does not cause any more financial strain than necessary. Schedule a consultation today and take the first step toward justice.

FAQs

What is sudden unintended acceleration?

Sudden unintended acceleration is when a vehicle accelerates on its own without the driver pressing the gas pedal. It can result from electronic throttle control faults, a stuck accelerator pedal, a brake system that fails to override the throttle, or software errors, and it can lead to high-speed crashes.

What should I do if my car accelerates on its own while driving?

Press the brake firmly with steady pressure, shift the transmission into neutral to disconnect the engine from the wheels, steer to the side of the road, and turn off the ignition once you have slowed. Do not pump the brakes, and do not remove a traditional key while moving.

Can a car accelerate by itself?

Yes. A car can accelerate without driver input if its electronic throttle, accelerator pedal, or onboard software malfunctions. These defects have triggered federal investigations and large vehicle recalls, and they can form the basis of a product liability claim.

Who is liable when a car accelerates on its own and causes a crash?

Liability can fall on the vehicle or parts manufacturer for a defect, or on a mechanic or dealership that failed to repair a known problem. In Washington, any party in the chain of distribution, including the manufacturer, component supplier, distributor, or seller, can be held responsible under the Product Liability Act.

How long do I have to file a sudden acceleration claim in Washington?

In Washington, the deadline to file most injury and product liability lawsuits is generally three years from the date of injury under RCW 4.16.080. A separate 12-year useful-safe-life limit can also apply to product claims, so acting early protects your evidence and your rights.

About the Author
Matt Conner
Matt Conner

Matt Conner has a proven track record of success. Following his graduation from Willamette University with a double major in mathematics and economics, Matt worked as an economist for the Office of Economic Analysis for the State of Oregon before moving onto working in mortgage banking and real estate. Although Matt would move on to law school shortly thereafter, his experience in the financial sector has provided him with valuable experience in how to achieve maximum compensation for his clients.

Learn More About Matt
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