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2016 Subaru Outback

Owner reports · Recalls · Investigations

More warning signs than most Outback years

Owner complaints for the 2016 Subaru Outback are substantially higher than the model-year median of 207.5.

About this comparison →

When problems were reported

Mileage at the reported incident

351 reports with mileage · 292 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Electrical System. Review the 309 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Visibility/wiper. Review the 83 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 53 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

22 crash reports3 fire reports8 injury reports

What owners actually said

643 reports
207,000 miles · Aug 20, 2026
Electrical System

Odometer Fraud. The contact purchased a 2016 Subaru Outback. The contact stated that after purchasing the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a private sale, but the contact discovered the seller was associated with a car dealer. At the time of purchase, the vehicle mileage was 87,059…

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Odometer Fraud. The contact purchased a 2016 Subaru Outback. The contact stated that after purchasing the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a private sale, but the contact discovered the seller was associated with a car dealer. At the time of purchase, the vehicle mileage was 87,059. After obtaining a Carfax report, the contact became aware that the mileage was 207,000.

NHTSA ODI #11758212

Mileage unknown · Aug 18, 2026
Service BrakesVehicle Speed Control

The car accelerates on its own at times. I am not pressing the gas or going down a hill. It is flat road, sometimes even pulling into my driveway. There is also feeling like I am being bumped from the back and moving when I am idle. I am strict about oil changes and have it fully inspected when I take it every 3 months as I am a…

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The car accelerates on its own at times. I am not pressing the gas or going down a hill. It is flat road, sometimes even pulling into my driveway. There is also feeling like I am being bumped from the back and moving when I am idle. I am strict about oil changes and have it fully inspected when I take it every 3 months as I am a single mom and cannot afford for my children and I to be hurt in an accident or be without a car.

NHTSA ODI #11757580

Mileage unknown · Aug 10, 2026
Vehicle Speed ControlCrash

UNKNOWN When pulling into a parking space at the [XXX] diner my 2016 OUTBACK suddenly accelerated while I was ready to shift from drive to park. It was as if I put the gas peddle to the floor. There was a car about 6feet in front of me which I hit. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. …

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UNKNOWN When pulling into a parking space at the [XXX] diner my 2016 OUTBACK suddenly accelerated while I was ready to shift from drive to park. It was as if I put the gas peddle to the floor. There was a car about 6feet in front of me which I hit. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI #11755851

Mileage unknown · Jul 20, 2026
Engine

There is a crack in the exhaust manifold and the exhaust smell is entering the cabin affecting driver and passengers' health. The problem has been confirmed by a Subaru dealer and an independent mechanic. There were no warning lights, I was made aware after routine maintenance by an independent mechanic. The same part has failed…

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There is a crack in the exhaust manifold and the exhaust smell is entering the cabin affecting driver and passengers' health. The problem has been confirmed by a Subaru dealer and an independent mechanic. There were no warning lights, I was made aware after routine maintenance by an independent mechanic. The same part has failed in multiple Subaru models: Recall WUJ-95 (SOA says my car is not covered in the recall/campaign due to my car's production date being 24 days after the "Affected Production Dates") . Additionally, Subaru of America extended the exhaust pipe warranty on the same part on other models, as late as 2018, so the part continued to be in use and problematic. Subaru of America says replacing the part is not covered by a recall for my car, however I feel strongly that it SOA should replace the part due to the proximity of my production date and the continued issues with the part across multiple models.

NHTSA ODI #11751682

Mileage unknown · Jul 1, 2026
Electrical System

The reporting citizen was driving legally on [XXX] going forward towards the parking lot next to the round about when an uncrewed, autonomous commercial vehicle operated by Waymo suffered a catastrophic software/hardware failure. The 6,000-pound driverless robot taxi aggressively pursued and chased the citizen’s vehicle in rever…

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The reporting citizen was driving legally on [XXX] going forward towards the parking lot next to the round about when an uncrewed, autonomous commercial vehicle operated by Waymo suffered a catastrophic software/hardware failure. The 6,000-pound driverless robot taxi aggressively pursued and chased the citizen’s vehicle in reverse for that full city block despite honking the horn and then holding it down the entire time as the killing 6,000 lbs robot car kept reversing towards the citizens car instead of going forward, forcing the citizen out into a perpendicular intersecting road onto [XXX] The citizen safely evaded a severe collision solely through high-speed defensive driving, reversing, and holding down the horn to warn surrounding motorists of the out-of-control vehicle. The autonomous system failed to stop, recognize the citizen's vehicle, or register the horn. Upon reviewing the internal vehicle data and footage, Waymo’s corporate office confirmed to the citizen on several calls after the [XXX] reporting that this specific vehicle "went rogue." Waymo admitted the failure was severe enough that they immediately pulled the specific vehicle out of operational service. I have several case #s from Waymo of each call admitting fault. These 6000 lbs killing car robots are NOT SAFE and should not be allowed on public roads where real humans are driving! I can’t sleep since [XXX] due to the nightmares of these killing car robots trying to kill me. I must factor in extra time to go anywhere as I cannot have these killing car robots near me and they are everywhere in my area. I visibly shake and sweat involuntarily whenever I see one of these even from very far away or even think about them—which is pretty much always now since [XXX]. Because Waymo deployed a malfunctioning 6,000-pound autonomous vehicle that aggressively chased a resident on public streets, this is an immediate Public Safety Hazard and Reckless Endangerment issue caused by Waymo. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOI

NHTSA ODI #11747584

Mileage unknown · Jun 15, 2026
Power Train

While driving the 2016 Subaru Outback, the vehicle experienced a sudden, catastrophic failure of the Continuously Variable Transmission (CVT). The transmission completely failed, resulting in an immediate and dangerous loss of propulsion while operating the vehicle. This created an immediate safety hazard for myself, my toddler…

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While driving the 2016 Subaru Outback, the vehicle experienced a sudden, catastrophic failure of the Continuously Variable Transmission (CVT). The transmission completely failed, resulting in an immediate and dangerous loss of propulsion while operating the vehicle. This created an immediate safety hazard for myself, my toddler and other drivers on the road, as the vehicle could no longer maintain speed or accelerate safely to clear traffic. A certified repair facility diagnosed the issue as a complete internal mechanical failure of the transmission, requiring a total replacement at an estimated cost of roughly $11,000. This generation of Subaru CVTs has a well-documented history of premature, catastrophic mechanical failure, which Subaru of America has previously acknowledged via past warranty extensions. The sudden loss of power caused by this engineering defect poses a severe and ongoing safety risk to consumers. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI #11744173

Mileage unknown · Jun 9, 2026
Electrical SystemSteeringVehicle Speed Control

SUBJECT: Formal Safety Defect Complaint: 2016 Subaru Outback – Manufacturing Nondisclosure of Latent "Day 1" Design Flaw Causing Ignition Key Entrapment, Uncommanded Steering Column Lockout, and Severe Family Safety Risk I am writing to formally report a severe, unaddressed safety defect and a deceptive corporate practice by Sub…

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SUBJECT: Formal Safety Defect Complaint: 2016 Subaru Outback – Manufacturing Nondisclosure of Latent "Day 1" Design Flaw Causing Ignition Key Entrapment, Uncommanded Steering Column Lockout, and Severe Family Safety Risk I am writing to formally report a severe, unaddressed safety defect and a deceptive corporate practice by Subaru of America, Inc. affecting my 2016 Subaru Outback. This vehicle suffers from a "Day 1" latent engineering flaw that causes the physical ignition key to become permanently trapped in the ignition cylinder, triggering an uncommanded, rigid locking of the steering column assembly. Subaru has possessed documented knowledge of this failure for years, cataloging it under Technical Service Bulletin TSB 16-112-18R. Rather than fulfilling its statutory obligation to issue a comprehensive federal safety recall, Subaru deployed a voluntary, time-bound 8-year warranty extension. Subaru conveniently did not notify me of this warranty extension. By doing so, the manufacturer unconscionably ignored this defect, placing its customers at direct peril. They capitalized on asymmetric information to shift both the financial burden and the severe physical safety risks of a known factory flaw onto my family, the moment an arbitrary time threshold expired. My family and I have been at active, continuous risk in this vehicle since the day we purchased it due to an engineering error that was present when the car rolled off the assembly line. The root cause of this failure is a fundamental engineering defect within the Continuously Variable Transmission (CVT) shifter assembly, specifically, the premature degradation of the electrical contacts within the select lever park-range switch.

NHTSA ODI #11742958

Mileage unknown · Jun 1, 2026
Unknown Or Other

Vehicle: 2016 Subaru Outback Recall Number: WUJ95 – Front Exhaust Pipe Bellows Crack I incurred repair expenses to address a condition that was later covered by Subaru Recall WUJ95. At the time of the repair, I was unaware that the vehicle was subject to this recall because I never received any recall notification from Subaru. …

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Vehicle: 2016 Subaru Outback Recall Number: WUJ95 – Front Exhaust Pipe Bellows Crack I incurred repair expenses to address a condition that was later covered by Subaru Recall WUJ95. At the time of the repair, I was unaware that the vehicle was subject to this recall because I never received any recall notification from Subaru. The affected component was the front exhaust pipe bellows assembly covered by Recall WUJ95. The repair was completed by an independent repair facility. The condition involved a cracked exhaust bellows assembly. The failure of this component allowed exhaust gases to escape from the exhaust system into the cabin and is the condition identified by Subaru in Recall WUJ95. The issue was diagnosed and repaired by an independent repair facility. The repair addressed the same component and condition that was subsequently identified by Subaru as part of Recall WUJ95. After learning of the recall, I contacted Subaru of America seeking reimbursement because the repair was completed after the recall had been issued. Subaru denied reimbursement and stated that repairs performed at third-party facilities are not eligible. During the reimbursement review process, I requested documentation showing when and how recall notification was sent to me, including the address used, mailing date, and method of notification. Subaru declined to provide this information. Subaru also declined to provide the specific guidelines relied upon in denying reimbursement. My concern is that I never received recall notification before obtaining the repair, which prevented me from having the recall performed through an authorized Subaru retailer. I am requesting that NHTSA review whether recall notification requirements were properly satisfied in this case and whether vehicle owners are being provided sufficient information to verify recall notification when reimbursement requests are denied.

NHTSA ODI #11741228

Mileage unknown · May 28, 2026
Service BrakesCrash

On 05/08/2026 the brakes failed while in a queue at a drive-up restaurant. The car was steered away to a flat part of the parking lot. After a restart the brakes returned to operation and the car was taken to the dealership where the brake line were flushed and the brake fluid replaced. On 05/25/2026 the brakes failed after back…

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On 05/08/2026 the brakes failed while in a queue at a drive-up restaurant. The car was steered away to a flat part of the parking lot. After a restart the brakes returned to operation and the car was taken to the dealership where the brake line were flushed and the brake fluid replaced. On 05/25/2026 the brakes failed after backing out of an inclined parking space in a parking garage. The car came to a stop when it backed into a concrete wall. The car was towed to the dealer. The dealer inspected inspected the car and reported that the brakes were working as they should.

NHTSA ODI #11740555

Mileage unknown · Apr 13, 2026
Electrical System

Parasitic battery drain due to a faulty DCM module. I've purchase 3 batteries in the past 16 months. I now have to keep a trickle charger on my car at night to ensure my battery is not dead in the morning. Unable to park overnight without charger due to fear of another dead battery.

NHTSA ODI #11730814

Official recalls

4

19V910000 · Air Bags: Air Bag/restraint Control Module

Dec 19, 2019

Subaru of America, Inc. (Subaru) is recalling certain 2016-2017 Outback vehicles. A replacement air bag control module may have been installed that is not compatible with the passenger air bag module, possibly affecting air bag deployment.

Consequence & remedy

Consequence: In the event of a crash necessitating passenger frontal air bag deployment, the air bag may not deploy properly, increasing the risk of injury.

Remedy: Subaru will notify owners, and dealers will replace the passenger air bag module, free of charge. The recall began February 3, 2020. Owners may contact Subaru customer service at 1-844-373-6614. Subaru's number for this recall is WUX-09.

16V292000 · Steering:column

May 11, 2016

Subaru of America, Inc. (Subaru) is recalling certain model year 2016-2017 Legacy and Outback vehicles manufactured February 29, 2016, to May 6, 2016. The steering column on the affected vehicles may have been improperly machined, and as a result, turning the steering wheel may have no effect on the direction of the wheels.

Consequence & remedy

Consequence: The loss of steering ability would increase the risk of a crash.

Remedy: Subaru will notify owners, and dealers will inspect the lot number on the steering column, replacing the steering column, as necessary, free of charge. The recall began May 13, 2016. Owners may contact Subaru customer service at 1-800-782-2783 or by visiting http://www.wtd65.service-campaign.com. Subaru's number for this recall is WTD-65. Note: Until the vehicles have been inspected, owners are advised not to drive their vehicles.

15V794000 · Power Train:driveline:differential Unit; Power Train:driveline:driveshaft

Nov 24, 2015

Subaru of America, Inc. (Subaru) is recalling certain model year 2016 Legacy vehicles manufactured October 24, 2015, to November 16, 2015, and Outback vehicles manufactured October 24, 2015, to November 17, 2015. Due to the improper tightening of the securing nuts, the drive shaft may separate from the rear differential.

Consequence & remedy

Consequence: If the drive shaft detaches from the rear differential, it may strike the fuel tank and result in a fuel leak, increasing the risk of a fire.

Remedy: Subaru has notified owners, and dealers will inspect the fastening nuts, and tighten or replace them, as necessary, free of charge. The recall began on December 10, 2015. Owners may contact Subaru customer service at 1-856-488-8500. Subaru's number for this recall is WQV-57.

Additional source detail variants (2)

Power Train:driveline:differential Unit

Subaru of America, Inc. (Subaru) is recalling certain model year 2016 Legacy vehicles manufactured October 24, 2015, to November 16, 2015, and Outback vehicles manufactured October 24, 2015, to November 17, 2015. Due to the improper tightening of the securing nuts, the drive shaft may separate from the rear differential.

Consequence: If the drive shaft detaches from the rear differential, it may strike the fuel tank and result in a fuel leak, increasing the risk of a fire.

Remedy: Subaru has notified owners, and dealers will inspect the fastening nuts, and tighten or replace them, as necessary, free of charge. The recall began on December 10, 2015. Owners may contact Subaru customer service at 1-856-488-8500. Subaru's number for this recall is WQV-57.

Power Train:driveline:driveshaft

Subaru of America, Inc. (Subaru) is recalling certain model year 2016 Legacy vehicles manufactured October 24, 2015, to November 16, 2015, and Outback vehicles manufactured October 24, 2015, to November 17, 2015. Due to the improper tightening of the securing nuts, the drive shaft may separate from the rear differential.

Consequence: If the drive shaft detaches from the rear differential, it may strike the fuel tank and result in a fuel leak, increasing the risk of a fire.

Remedy: Subaru has notified owners, and dealers will inspect the fastening nuts, and tighten or replace them, as necessary, free of charge. The recall began on December 10, 2015. Owners may contact Subaru customer service at 1-856-488-8500. Subaru's number for this recall is WQV-57.

15V502000 · Power Train:automatic Transmission; Power Train:driveline:driveshaft

Aug 10, 2015

Subaru of America, Inc. (Subaru) is recalling certain 2015 and 2016 model year Subaru Legacy 4-Door and Outback vehicles manufactured July 3, 2015, to July 27, 2015. Transmission oil may leak from a deformed seal cap on the propeller shaft yoke.

Consequence & remedy

Consequence: If the transmission oil leaks onto the exhaust pipe, there is a possible risk of fire.

Remedy: Subaru will notify owners, and dealers will replace the propeller shaft, free of charge. The recall began on August 28, 2015. Owners may contact 1-800-782-2783. Subaru's number for this recall is WQU-56.

Additional source detail variants (2)

Power Train:automatic Transmission

Subaru of America, Inc. (Subaru) is recalling certain 2015 and 2016 model year Subaru Legacy 4-Door and Outback vehicles manufactured July 3, 2015, to July 27, 2015. Transmission oil may leak from a deformed seal cap on the propeller shaft yoke.

Consequence: If the transmission oil leaks onto the exhaust pipe, there is a possible risk of fire.

Remedy: Subaru will notify owners, and dealers will replace the propeller shaft, free of charge. The recall began on August 28, 2015. Owners may contact 1-800-782-2783. Subaru's number for this recall is WQU-56.

Power Train:driveline:driveshaft

Subaru of America, Inc. (Subaru) is recalling certain 2015 and 2016 model year Subaru Legacy 4-Door and Outback vehicles manufactured July 3, 2015, to July 27, 2015. Transmission oil may leak from a deformed seal cap on the propeller shaft yoke.

Consequence: If the transmission oil leaks onto the exhaust pipe, there is a possible risk of fire.

Remedy: Subaru will notify owners, and dealers will replace the propeller shaft, free of charge. The recall began on August 28, 2015. Owners may contact 1-800-782-2783. Subaru's number for this recall is WQU-56.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

1

EA21002 · Desiccated Air Bag Inflator Rupture

Opened Sep 17, 2021 · No close date supplied

Status: open (inferred from source dates) · Air Bags:frontal:driver Side:inflator Module; Air Bags:frontal:passenger Side:inflator Module

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.

Additional source detail variants (2)

Air Bags:frontal:driver Side:inflator Module

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.

Air Bags:frontal:passenger Side:inflator Module

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.

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