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2017 Subaru Outback

Owner reports · Recalls · Investigations

More warning signs than most Outback years

Owner complaints for the 2017 Subaru Outback are substantially higher than the model-year median of 207.5.

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When problems were reported

Mileage at the reported incident

516 reports with mileage · 401 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 391 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Visibility/wiper. Review the 205 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 47 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

32 crash reports3 fire reports17 injury reports

Electrical System complaints

391 reports
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18,341 miles · Oct 27, 2020
Electrical System

2017 SUBARU OUTBACK. NOW ON BATTERY #6, THIRD ONE REPLACED SINCE FEBRUARY 2020. BATTERY EACH TIME WAS COMPLETELY DEAD, REQUIRING ROADSIDE SERVICE. DEALER REPLACES, SAYS THEY DO A SYSTEM ANALYSIS. ROADSIDE TOWING COMPANY EACH TIME TELLS ME THEY SEE LOTS OF ISSUES WITH 2016 - 2020 OUTBACKS. CONTACT WITH SUBARU I AM TOLD THERE ARE …

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2017 SUBARU OUTBACK. NOW ON BATTERY #6, THIRD ONE REPLACED SINCE FEBRUARY 2020. BATTERY EACH TIME WAS COMPLETELY DEAD, REQUIRING ROADSIDE SERVICE. DEALER REPLACES, SAYS THEY DO A SYSTEM ANALYSIS. ROADSIDE TOWING COMPANY EACH TIME TELLS ME THEY SEE LOTS OF ISSUES WITH 2016 - 2020 OUTBACKS. CONTACT WITH SUBARU I AM TOLD THERE ARE NO RECALLS. I WAS EVEN TOLD I NEEDED TO DRIVE THE CAR EVERY FEW DAYS. THAT IS RIDICULOUS. I HAVE NEVER HAD ANY ISSUES LIKE THIS WITH OTHER CARS IN MY 56 YEARS OF DRIVING. CAR WAS STATIONARY, FORTUNATELY AT OUR HOUSE SO I WAS NOT STRANDED WITH A DEAD BATTERY. DOING AN INTERNET SEARCH FOR COMPLAINTS ABOUT THIS I NOTED THERE WERE MANY COMPLAINTS EXPRESSED. BATTERY THAT CAME WITH THE CAR DEC 14, 2017 - NEW BATTERY ...DATE NOT RECORDED...NEW BATTERY FEB 3, 2020 - BATTERY REPLACED APRIL 6,2020 - BATTERY REPLACED OCT 26, 2020 - BATTERY REPLACED FILE ATTACHED WITH SERVICE REPORT FOR BATTERIES REPLACED IN 2020 FROM SUBARU DEALER

NHTSA ODI #11366617

34,800 miles · Oct 23, 2020
Electrical System

WITHIN THE PAST 3 WEEKS, WE HAVE ENCOUNTERED AN INTERMITTENT AND RECURRING PROBLEM OF BEING UNABLE TO REMOVE THE KEYS FROM THE IGNITION WHEN THE CAR IS TURNED OFF AFTER DRIVING, AND IN "PARK". CAR IS STATIONARY WHEN THIS OCCURS.

NHTSA ODI #11365956

Mileage unknown · Sep 15, 2020
Electrical System

IN NOVEMBER 2019 I HAD TO REPLACE MY BATTERY WHICH WAS REPLACED FOR FREE BY SUBARU IN CHANDLER, AZ AND WAS GUARANTEED FOR 30 MONTHS, IN SEPTEMBER 2020, I HAD TO REPLACE MY BATTERY AGAIN WHICH WAS INSTALLED BY SUBARU IN CHANDLER, AZ FOR FREE AND GUARANTEED FOR 30 MONTHS. I DID A SEARCH ON FAULTY BATTERIES ON SUBARU AND FOUND THE …

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IN NOVEMBER 2019 I HAD TO REPLACE MY BATTERY WHICH WAS REPLACED FOR FREE BY SUBARU IN CHANDLER, AZ AND WAS GUARANTEED FOR 30 MONTHS, IN SEPTEMBER 2020, I HAD TO REPLACE MY BATTERY AGAIN WHICH WAS INSTALLED BY SUBARU IN CHANDLER, AZ FOR FREE AND GUARANTEED FOR 30 MONTHS. I DID A SEARCH ON FAULTY BATTERIES ON SUBARU AND FOUND THE BELOWS INFORMATION.. SO I DECIDED TO FILE A REPORT. " SUBARU IS HIT WITH A NEW LAWSUIT ALLEGING THE 2016-2020 SUBARU OUTBACK AND 2019-2020 ASCENT HAVE DEFECTIVE ELECTRICAL SYSTEMS CAUSING PREMATURE BATTERY FAILURE. WHAT SHOULD OWNERS DO IF YOU ARE EXPERIENCING THE SAME ISSUES?"

NHTSA ODI #11355247

17,000 miles · Sep 14, 2020
Electrical System

BATTERY GOES DEAD OVERNIGHT. IN 2019 I EXPERIENCED A DEAD BATTERY ON MY OUTBACK. IT HAPPENED IN EARLY 2020. I REPLACED THE BATTERY AROUND MAY OF THIS YEAR. I TOOK IT TO LOCAL DEALER AND LEFT FOR 2 DAYS. DEALER UPDATED ECO AND SAID THAT SHOULD FIX IT, FAIL INAGAIN IN JULY 2020 AND AGAIN TODAY 9-15-2020

NHTSA ODI #11354872

38,000 miles · Sep 11, 2020
Electrical System

MULTIPLE BATTERY FAILURES- BATTERY DIES REPEATEDLY. HAVE REPLACED 4 TIMES ALREADY. LAST DEAD BATTERY IS TODAY WITH IT HAVING DIED LAST WEEK AS WELL. THIS WILL BE 3RD BATTERY IN LESS THAN A YEAR.SOMETIMES HEADLIGHT WILL DIMLY FLASH OR THERE WILL BE A THUMPING NOISE THAT COMES FROM THE BACK, POSSIBLY THE TAILGATE. OTHER TIMES IT I…

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MULTIPLE BATTERY FAILURES- BATTERY DIES REPEATEDLY. HAVE REPLACED 4 TIMES ALREADY. LAST DEAD BATTERY IS TODAY WITH IT HAVING DIED LAST WEEK AS WELL. THIS WILL BE 3RD BATTERY IN LESS THAN A YEAR.SOMETIMES HEADLIGHT WILL DIMLY FLASH OR THERE WILL BE A THUMPING NOISE THAT COMES FROM THE BACK, POSSIBLY THE TAILGATE. OTHER TIMES IT IS DEAD NEXT DAY WHEN GOING TO START IT AFTER HAVING BEEN DRIVEN THE PREVIOUS DAY. KEYS ARE NOT KEPT IN CAR.

NHTSA ODI #11354501

12,893 miles · Sep 7, 2020
Electrical System

THE BATTERY IS DISCHARGING RESULTING IN A DEAD BATTERY. NO DOORS OR HATCH ARE LEFT OPEN AND EVERYTHING IS TURNED OFF WHEN THE CAR IS PARKED. THE CAR CAN BE JUMPED AND THE BATTERY RECHARGED, ONLY TO HAVE IT DISCHARGE AGAIN AFTER A FEW DAYS TIME. THIS IS THE THIRD TIME IT HAS HAPPENED OVER THE PAST 2 MONTHS.

NHTSA ODI #11353553

Mileage unknown · Sep 7, 2020
Electrical System

THE BATTERY ON MY 2017 SUBARU OUTBACK KEEPS DRAINING AND GOING DEAD. THIS IS THE FOURTH BATTERY GONE DEAD IN FOUR YEARS. LAST ONE ONLY LASTED LITTLE OVER THREE MONTHS. WE REPLACED WITH BRAND NEW FACTORY BATTERY AT END OF MAY. TODAY IN SEPTEMBER 7TH. BATTERY COMPLETELY DEAD AS I TRY TO START THE VEHICLE. LAST TIME I TOOK THE VEHI…

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THE BATTERY ON MY 2017 SUBARU OUTBACK KEEPS DRAINING AND GOING DEAD. THIS IS THE FOURTH BATTERY GONE DEAD IN FOUR YEARS. LAST ONE ONLY LASTED LITTLE OVER THREE MONTHS. WE REPLACED WITH BRAND NEW FACTORY BATTERY AT END OF MAY. TODAY IN SEPTEMBER 7TH. BATTERY COMPLETELY DEAD AS I TRY TO START THE VEHICLE. LAST TIME I TOOK THE VEHICLE TO A SUBARU DEALER. THEY SAID EVERYTHING ELECTRICAL WAS OK ON THE CAR. TECHNICIAN SAID THE BACK DOME LIGHT WAS ON. THIS TIME I CHECKED THE DOME LIGHT AND IT WAS ON OFF POSITION. I BELIEVE THERE IS SOME KIND OF ELCTRICAL ISSUE WITH THIS VEHICLE THAT IS CAUSING THE BATTERIES TO DIE.

NHTSA ODI #11353525

33,000 miles · Sep 4, 2020
Electrical System

BATTERY IS DRAINING PREMATURELY.

NHTSA ODI #11353199

27,500 miles · Sep 2, 2020
Electrical System

RECURRENT BATTERY DEAD PROBLEM; THEN FINALLY NOT CHARGING AT ALL ; DESPITE OF BATTERY BEING FULL DEALER ALWAYS DOING THINGS TO THE SYSTEM WITH UPDATES ; AND NEVER ABLE TO FIX THE PROBLEM

NHTSA ODI #11352841

39,000 miles · Sep 2, 2020
Electrical System

THIS 2017 OUTBACK SUDDENLY LOST ALL ELECTRICAL POWER. EVEN JUMP STARTING THE VEHICLE WAS DIFFICULT. THEE SERVICE THAT CAME TO JUMP THE CAR SAID THEY HAVE SEEN A LOT OF SUBARU'S NEEDING TO BE JUMPED AND THIS WAS FROM A SUBARU'S ROADSIDE SERVICE PROVIDER. PUTTING THE BATTERY ON A CHARGER WOULD NOT HELP. I BROUGHT THE CAR TO THE …

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THIS 2017 OUTBACK SUDDENLY LOST ALL ELECTRICAL POWER. EVEN JUMP STARTING THE VEHICLE WAS DIFFICULT. THEE SERVICE THAT CAME TO JUMP THE CAR SAID THEY HAVE SEEN A LOT OF SUBARU'S NEEDING TO BE JUMPED AND THIS WAS FROM A SUBARU'S ROADSIDE SERVICE PROVIDER. PUTTING THE BATTERY ON A CHARGER WOULD NOT HELP. I BROUGHT THE CAR TO THE SUBARU DEALERSHIP WHERE WE PURCHASED THE CAR. THEY SAID THE BATTERY WAS BAD AND NEEDED TO BE REPLACED. THEY DID NOT CHECK THE CHARGING SYSTEM SAYING IT WAS DEFINITELY THE BATTERY. AT A COST OF $165.78 THE BATTERY WAS REPLACED. THIS SEEMED VERY ODD TO ME THAT THE BATTERY WOULD ALREADY BE BAD AFTER THREE YEARS. I DID SOME INTERNET CHECKING AND FOUND OUT THERE ARE MANY PEOPLE EXPERIENCING THE SAME ISSUE. NOTHING WAS LEFT ON IN THE CAR BUT IT WAS NOT BEING DRIVEN EVERYDAY AS IT ONCE HAD. SEEING HOW MANY PEOPLE ARE HAVING THIS ISSUE I WAS WONDERING WHY THERE HAS NOT BEEN A RECALL FOR THIS MODEL AND YEAR?

NHTSA ODI #11352829

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.

16V716000 · Air Bags:knee Bolster; Steering:column

Oct 6, 2016

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Legacy and Outback vehicles manufactured September 21, 2016, to September 23, 2016. In the affected vehicles, the knee guard bracket may not be properly attached to the steering beam assembly.

Consequence & remedy

Consequence: If the knee guard is not properly attached and the driver is not wearing a seatbelt, the knee guard may not be able to properly restrain the driver's lower body in the event of a crash, increasing the risk of injury.

Remedy: Subaru will notify owners, and dealers will inspect the knee guard welding on each vehicle's steering beam, replacing the beam as necessary, free of charge. The recall began November 14, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTL-72.

Additional source detail variants (2)

Air Bags:knee Bolster

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Legacy and Outback vehicles manufactured September 21, 2016, to September 23, 2016. In the affected vehicles, the knee guard bracket may not be properly attached to the steering beam assembly.

Consequence: If the knee guard is not properly attached and the driver is not wearing a seatbelt, the knee guard may not be able to properly restrain the driver's lower body in the event of a crash, increasing the risk of injury.

Remedy: Subaru will notify owners, and dealers will inspect the knee guard welding on each vehicle's steering beam, replacing the beam as necessary, free of charge. The recall began November 14, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTL-72.

Steering:column

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Legacy and Outback vehicles manufactured September 21, 2016, to September 23, 2016. In the affected vehicles, the knee guard bracket may not be properly attached to the steering beam assembly.

Consequence: If the knee guard is not properly attached and the driver is not wearing a seatbelt, the knee guard may not be able to properly restrain the driver's lower body in the event of a crash, increasing the risk of injury.

Remedy: Subaru will notify owners, and dealers will inspect the knee guard welding on each vehicle's steering beam, replacing the beam as necessary, free of charge. The recall began November 14, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTL-72.

16V576000 · Service Brakes, Hydraulic:foundation Components:disc:caliper; Suspension

Aug 3, 2016

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Outback vehicles manufactured June 20, 2016, to June 23, 2016. The affected vehicles may have improperly tightened attaching bolts for the front left and right brake calipers, wheel hubs, and the right stabilizer clamp.

Consequence & remedy

Consequence: If any of the front brake caliper, wheel hub or stabilizer clamp attaching bolts loosen or detach, the related components would also become loose and may detach possibly making the vehicle unstable and reducing the braking capability. These conditions would increase the risk of a crash.

Remedy: Subaru has notified owners, and dealers will inspect the bolts for proper torque, and replace any loose bolts, free of charge. The recall began on August 8, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTE-66.

Additional source detail variants (2)

Service Brakes, Hydraulic:foundation Components:disc:caliper

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Outback vehicles manufactured June 20, 2016, to June 23, 2016. The affected vehicles may have improperly tightened attaching bolts for the front left and right brake calipers, wheel hubs, and the right stabilizer clamp.

Consequence: If any of the front brake caliper, wheel hub or stabilizer clamp attaching bolts loosen or detach, the related components would also become loose and may detach possibly making the vehicle unstable and reducing the braking capability. These conditions would increase the risk of a crash.

Remedy: Subaru has notified owners, and dealers will inspect the bolts for proper torque, and replace any loose bolts, free of charge. The recall began on August 8, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTE-66.

Suspension

Subaru of America, Inc. (Subaru) is recalling certain model year 2017 Outback vehicles manufactured June 20, 2016, to June 23, 2016. The affected vehicles may have improperly tightened attaching bolts for the front left and right brake calipers, wheel hubs, and the right stabilizer clamp.

Consequence: If any of the front brake caliper, wheel hub or stabilizer clamp attaching bolts loosen or detach, the related components would also become loose and may detach possibly making the vehicle unstable and reducing the braking capability. These conditions would increase the risk of a crash.

Remedy: Subaru has notified owners, and dealers will inspect the bolts for proper torque, and replace any loose bolts, free of charge. The recall began on August 8, 2016. Owners may contact Subaru customer service at 1-800-782-2783. Subaru's number for this recall is WTE-66.

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.

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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