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2015 BMW 328XI

Owner reports · Recalls · Investigations

Limited comparison data

There is not enough comparable history to draw a useful model-year comparison.

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How this year compares

Owner complaints by model year

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Counts vary with age, sales and reporting. They are not failure rates.

What owners reported most

All reported categories

Tap a category to read its complaints. One report may name several components.

When problems were reported

Mileage at the reported incident

Limited mileage data: 10 of 14 reports include usable mileage. There isn’t enough coverage to show a useful chart.

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.

  • Service Brakes. Review the 5 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Electrical System. Review the 4 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 2 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

1 crash reports1 fire reports2 injury reports

What owners actually said

14 reports
Mileage unknown · Oct 23, 2024
Electrical SystemEngine And Engine Cooling

The contact owns a 2015 BMW 328XI. The contact received notification of NHTSA Campaign Number: 24V608000 (ENGINE AND ENGINE COOLING, ELECTRICAL SYSTEM); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of tim…

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The contact owns a 2015 BMW 328XI. The contact received notification of NHTSA Campaign Number: 24V608000 (ENGINE AND ENGINE COOLING, ELECTRICAL SYSTEM); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. The VIN was not available.

NHTSA ODI #11621445

35,000 miles · Jul 13, 2019
Electrical SystemEngineService Brakes

ON WAY HOME TODAY 7/12/2019 CAR STALLED OUT. I HAD VERY LITTLE BRAKES, STEERING WAS HARD TO TURN AND CAR SLOWED DOWN QUICK. IT STARTED BACK UP BUT THEN THE PASSENGER SIDE WINDOW STARTED GOING DOWN ON ITS OWN, AND THE A/C STOPPED WORKING, AND THE DRIVERS SIDE WINDOW WILL NOT GO UP, AND IT KEEPS GETTING A WARNING GOING ON THEN OFF…

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ON WAY HOME TODAY 7/12/2019 CAR STALLED OUT. I HAD VERY LITTLE BRAKES, STEERING WAS HARD TO TURN AND CAR SLOWED DOWN QUICK. IT STARTED BACK UP BUT THEN THE PASSENGER SIDE WINDOW STARTED GOING DOWN ON ITS OWN, AND THE A/C STOPPED WORKING, AND THE DRIVERS SIDE WINDOW WILL NOT GO UP, AND IT KEEPS GETTING A WARNING GOING ON THEN OFF THEN ON SAYS SOMETHING ABOUT BRAKE LAMP CONTROL MALFUNCTION. WHEN I GOT IT HOME I LEFT IN DRIVEWAY FOR A WHILE WHEN I TRIED TO START IT BACK UP I STARTED GETTING TRANSMISSION FAILURE WARNING AND SOMETHING ABOUT THE ENGINE. THEN LATER THE CAR DID START UP WITHOUT THE WARNINGS BUT STILL HAS THE ORIGINAL PROBLEMS.

NHTSA ODI #11231555

Mileage unknown · May 8, 2019
Tires

SIDEWALLS ARE WEAK AND BLOW OUT. HAD 5 TIRES REPLACED; STILL HAVE ONE WITH BUBBLE IN SIDEWALK. BRIDGESTONE REP SAYS FROM HITTING POTHOLES. I HAVE ANOTHER SET OF TIRES(MICHELIN) THAT I DRIVE ON THE SAME ROADS WITH NO ISSUES. BRIDGESTONE DRIVEGUARD

NHTSA ODI #11206167

26,700 miles · Dec 30, 2017
Service BrakesCrashInjury

I WAS DRIVING ON I-95 AT PACE WITH TRAFFIC, NO SPEEDING AND THE CAR IN FRONT OF ME ABRUPTLY HIT THE BREAKS. I WAS 3 TO 4 CAR LENGTHS AWAY. I HIT THE BRAKES BUT WAS NOT CONCERNED BECAUSE I HAD PLENTY OF DISTANCE AND THE CAR IS EQUIPPED WITH ABS BRAKES. AS I HIT THE BRAKES, IT SEEMED LIKE THE CAR WAS NOT SLOWING DOWN EVEN AS I PR…

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I WAS DRIVING ON I-95 AT PACE WITH TRAFFIC, NO SPEEDING AND THE CAR IN FRONT OF ME ABRUPTLY HIT THE BREAKS. I WAS 3 TO 4 CAR LENGTHS AWAY. I HIT THE BRAKES BUT WAS NOT CONCERNED BECAUSE I HAD PLENTY OF DISTANCE AND THE CAR IS EQUIPPED WITH ABS BRAKES. AS I HIT THE BRAKES, IT SEEMED LIKE THE CAR WAS NOT SLOWING DOWN EVEN AS I PRESSED HARDER AND THE ABS BRAKES NEVER KICKED IN. I WAS IN THE MIDDLE LANE AND WAS UNABLE TO SWERVE WITHOUT CAUSING A MAJOR ACCIDENT. MY ONLY OPTION WAS TO HIT THE CAR DIRECTLY IN FRONT OF ME. THE CAR I HIT SUSTAINED A SCRAPED REAR BUMPER NO OTHER DAMAGE.

NHTSA ODI #11057684

17,000 miles · May 12, 2017
EngineFire

TL* THE CONTACT OWNED A 2015 BMW 328XI. WHILE THE VEHICLE WAS PARKED, IT CAUGHT ON FIRE. THE FIRE DEPARTMENT EXTINGUISHED THE FIRE. A FIRE REPORT WAS NOT FILED. THE CONTACT WAS UNAWARE OF HOW THE FIRE STARTED. THE VEHICLE WAS DESTROYED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VIN WAS UNKNOWN. THE APPROXIMATE FAILURE MI…

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TL* THE CONTACT OWNED A 2015 BMW 328XI. WHILE THE VEHICLE WAS PARKED, IT CAUGHT ON FIRE. THE FIRE DEPARTMENT EXTINGUISHED THE FIRE. A FIRE REPORT WAS NOT FILED. THE CONTACT WAS UNAWARE OF HOW THE FIRE STARTED. THE VEHICLE WAS DESTROYED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE VIN WAS UNKNOWN. THE APPROXIMATE FAILURE MILEAGE WAS 17,000.

NHTSA ODI #10985420

Mileage unknown · Nov 18, 2016
Unknown Or OtherInjury

TRUNK CLOSURE MECHANISM HAS A SENSOR THAT CAN BE ACTIVATED BY PASSING A FOOT UNDER THE BUMPER AREA WHILE TRUNK IS OPENED WHILE STATIONARY. SENSOR CANNOT BE DEACTIVATED AND CAN BE ACCIDENTALLY ACTIVATED BY FOOT-ANIMAL CAUSING THE TRUNK TO CLOSE CAUSING INJURY TO PERSON IN AREA. WIFE BEING TREATED BY A NEUROLOGIST FOR CONCUSSI…

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TRUNK CLOSURE MECHANISM HAS A SENSOR THAT CAN BE ACTIVATED BY PASSING A FOOT UNDER THE BUMPER AREA WHILE TRUNK IS OPENED WHILE STATIONARY. SENSOR CANNOT BE DEACTIVATED AND CAN BE ACCIDENTALLY ACTIVATED BY FOOT-ANIMAL CAUSING THE TRUNK TO CLOSE CAUSING INJURY TO PERSON IN AREA. WIFE BEING TREATED BY A NEUROLOGIST FOR CONCUSSION, AND POTENTIAL NECK INJURIES. DEALER IN EGG HARBOR NEW JERSEY STATES SENSOR CANNOT BE DEACTIVATED. SYSTEM IS A SAFETY HAZARD.

NHTSA ODI #10926833

Mileage unknown · Jul 26, 2016
Visibility/wiper

I'VE GONE THROUGH 3 WINDSHIELDS IN 2 MONTHS ,2 THROUGH MY INSURANCE AND THE 3RD THROUGH BMW ,EARLY MORNING AND LATE AFTERNOON THE WINDSHIELD IS COVERED WITH TINY SPARKLES, THIS WAS NOTICED BY ME THE NEXT DAY ON ALL 3 ,SO IT HAS NOTHING TO DO WITH ROAD DEBRI, ON LINE THERE ARE MANY PEOPLE COMPLAINING ABOUT THIS AND NO ONE KNOWS W…

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I'VE GONE THROUGH 3 WINDSHIELDS IN 2 MONTHS ,2 THROUGH MY INSURANCE AND THE 3RD THROUGH BMW ,EARLY MORNING AND LATE AFTERNOON THE WINDSHIELD IS COVERED WITH TINY SPARKLES, THIS WAS NOTICED BY ME THE NEXT DAY ON ALL 3 ,SO IT HAS NOTHING TO DO WITH ROAD DEBRI, ON LINE THERE ARE MANY PEOPLE COMPLAINING ABOUT THIS AND NO ONE KNOWS WHAT TO DO ,IT IS A SAFETY ISSUE WITH THE SUN HITTING IT.

NHTSA ODI #10888833

5,500 miles · Jun 7, 2016
Structure

SUN ROOF GLASS SHATTERED WHILE DRIVING ON SMOOTH HIGHWAY AT ABOUT 65MPH. NO EVIDENCE OF IMPACT (PER BMW DEALER) AND NO IMPACT BY OBJECT DETECTED BY DRIVER. NO OVER PASSES OR ROAD SIGNS WERE NEAR THE CAR AT THE TIME. OUTSIDE TEMPERATURE IN MID 80S AND SUNNY. AIR CONDITIONING ON IN CAR. LARGE HOLE IN MIDDLE OF SUNROOF AND MOST OF …

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SUN ROOF GLASS SHATTERED WHILE DRIVING ON SMOOTH HIGHWAY AT ABOUT 65MPH. NO EVIDENCE OF IMPACT (PER BMW DEALER) AND NO IMPACT BY OBJECT DETECTED BY DRIVER. NO OVER PASSES OR ROAD SIGNS WERE NEAR THE CAR AT THE TIME. OUTSIDE TEMPERATURE IN MID 80S AND SUNNY. AIR CONDITIONING ON IN CAR. LARGE HOLE IN MIDDLE OF SUNROOF AND MOST OF THE GLASS ENDED UP ON THE HIGHWAY BEHIND THE VEHICLE. SOME GLASS WAS IN THE SUNSHADE AND CAME THROUGH THE VENTILATION SLOTS. BMW AGREED TO REPLACE UNDER WARRANTY.

NHTSA ODI #10872906

8,346 miles · Oct 29, 2015
Unknown Or Other

I WAS DRIVING ON THE HIGHWAY AND THE SUNROOF ON MY CAR JUST EXPLODED. UNFORTUNATELY I DID NOT HAVE THE COVER CLOSED SO WHEN IT EXPLODED IT FELL AND HIT ME IN THE HEAD. IT FELL IN A LARGE CHUNK ONTO ME THEN SHATTERED. I WAS NOT GOING UNDER ANYTHING AND WAS DRIVING ON A STRAIGHTAWAY AT ABOUT 70MPH.

NHTSA ODI #10786956

8,508 miles · Aug 10, 2015
Electrical System

JUST AS I WAS DRIVING OFF THE EXIT RAMP FROM THE INTERSTATE HIGHWAY, I LOST ALL POWER, INCLUDING STEERING WHEEL, BRAKES AND THROTTLE. FORTUNATELY THE CAR SLOWED TO A STOP BEFORE IT ENTERED THE ROAD, ALTHOUGH THE SHERIFF'S DEPUTY WHO SOON SHOWED UP WAS CONCERNED THAT THE CAR WAS IN A DANGEROUS LOCATION. AFTER THE CAR STOPPED, I …

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JUST AS I WAS DRIVING OFF THE EXIT RAMP FROM THE INTERSTATE HIGHWAY, I LOST ALL POWER, INCLUDING STEERING WHEEL, BRAKES AND THROTTLE. FORTUNATELY THE CAR SLOWED TO A STOP BEFORE IT ENTERED THE ROAD, ALTHOUGH THE SHERIFF'S DEPUTY WHO SOON SHOWED UP WAS CONCERNED THAT THE CAR WAS IN A DANGEROUS LOCATION. AFTER THE CAR STOPPED, I DISCOVERED THAT THERE WAS NO POWER TO ANY PART OF THE CAR, INCLUDING HAZARD LIGHTS, WINDOWS OR DOOR LOCKS, OR EVEN THE LATCH TO OPEN THE HOOD. AFTER THE CAR WAS TOWED TO THE BMW DEALERSHIP, I WAS TOLD THAT THE PART THAT FAILED WAS CALLED THE FEM, FRONT ELECTRONIC MODULE. I AM REPORTING THIS PROBLEM BECAUSE IT IS POTENTIALLY VERY DANGEROUS. IF IT HAD HAPPENED WHILE STILL ON THE HIGHWAY, OR EVEN WORSE, AT NIGHT, IT COULD HAVE BEEN DISASTEROUS. I AM CONCERNED THAT THERE IS NO FAILSAFE FOR THE FAILURE OF A PART LIKE THIS, AND THAT BAD QUALITY CONTROL ON AN ELECTRONIC PART CAN SO EASILY CAUSE A SERIOUS ACCIDENT.

NHTSA ODI #10747673

Official recalls

2

24V608000 · Electrical System:wiring:connectors/plugs/receptacles; Engine And Engine Cooling:cooling System:pump

Aug 13, 2024

BMW of North America, LLC. (BMW) is recalling certain 2012-2015 X1 sDrive28i, X1 xDrive28i, 2012-2016 Z4 sDrive28i, 528i, 528i xDrive, 328i, 328xi, 2016-2018 X5 xdrive 40e, 2014-2016 228i, 228xi, 428i, 428i xDrive, 328xi Gran Turismo, 2013-2017 X3 sDrive28i, X3 xDrive28i, 2015-2018 X4 xDrive28i, 2015-2016 428xi vehicles. An improperly sealed electrical connector on the water pump may be exposed to water and short circuit.

Consequence & remedy

Consequence: An electrical short increases the risk of a fire.

Remedy: Dealers will inspect and replace the water pump and plug connector as necessary, and install a protective shield, free of charge. Owner notification letters were mailed on March 28, 2025. Owners may contact BMW customer service at 1-800-525-7417.

Additional source detail variants (2)

Electrical System:wiring:connectors/plugs/receptacles

BMW of North America, LLC. (BMW) is recalling certain 2012-2015 X1 sDrive28i, X1 xDrive28i, 2012-2016 Z4 sDrive28i, 528i, 528i xDrive, 328i, 328xi, 2016-2018 X5 xdrive 40e, 2014-2016 228i, 228xi, 428i, 428i xDrive, 328xi Gran Turismo, 2013-2017 X3 sDrive28i, X3 xDrive28i, 2015-2018 X4 xDrive28i, 2015-2016 428xi vehicles. An improperly sealed electrical connector on the water pump may be exposed to water and short circuit.

Consequence: An electrical short increases the risk of a fire.

Remedy: Dealers will inspect and replace the water pump and plug connector as necessary, and install a protective shield, free of charge. Owner notification letters were mailed on March 28, 2025. Owners may contact BMW customer service at 1-800-525-7417.

Engine And Engine Cooling:cooling System:pump

BMW of North America, LLC. (BMW) is recalling certain 2012-2015 X1 sDrive28i, X1 xDrive28i, 2012-2016 Z4 sDrive28i, 528i, 528i xDrive, 328i, 328xi, 2016-2018 X5 xdrive 40e, 2014-2016 228i, 228xi, 428i, 428i xDrive, 328xi Gran Turismo, 2013-2017 X3 sDrive28i, X3 xDrive28i, 2015-2018 X4 xDrive28i, 2015-2016 428xi vehicles. An improperly sealed electrical connector on the water pump may be exposed to water and short circuit.

Consequence: An electrical short increases the risk of a fire.

Remedy: Dealers will inspect and replace the water pump and plug connector as necessary, and install a protective shield, free of charge. Owner notification letters were mailed on March 28, 2025. Owners may contact BMW customer service at 1-800-525-7417.

15V520000 · Exterior Lighting

Aug 17, 2015

BMW North America, LLC (BMW) is recalling certain model year 2012-2015 320i, 320xi, 328i, 328xi, 335i, 335xi, and ActiveHybrid3 vehicles manufactured October 20, 2011, to June 22, 2015, 2014-2015 328xi Sports Wagon vehicles manufactured March 21, 2013, to March 17, 2015, 2014-2015 328d, 328xd vehicles manufactured June 28, 2013, to April 21, 2015, and 2014-2015 328xd Sports Wagon vehicles manufactured July 5, 2013, to April 21, 2015. The affected vehicles may have been programmed with new software that inadvertently makes the front side marker lights inoperative in conjunction with the parking lights or the headlights. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."

Consequence & remedy

Consequence: If the side marker lights do not illuminate, the vehicle may be less visible at night, increasing the risk of a crash.

Remedy: BMW will notify owners, and dealers will upload revised software to correct the issue, free of charge. The recall began on October 7, 2015. Owners may contact BMW customer service at 1-800-525-7417 or by email at CustomerRelations@bmwusa.com.

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.