NHTSA owner reports · September 18, 2026 snapshot.
Electrical System complaints
391 reportsClear category filter13,576 miles · Mar 22, 2021
Electrical System
IN HOME DRIVEWAY, CAR WON'T START, BATTERY DEAD. TOWED TO DEALER, BATTERY GOOD BUT NEEDED CHARGE. DEC11, 2020, IN DRIVEWAY, CAR WON'T START, AND CLICKING NOISE IN REAR POWER GATE, TOWED TO DEALER. BATTERY TESTED BAD, REPLACED. ALSO REPLACED PRG MODULE FOR REAR GATE. MAR 8, 2021, IN DRIVEWAY AT HOME, WON'T START. JUMPED AND …
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IN HOME DRIVEWAY, CAR WON'T START, BATTERY DEAD. TOWED TO DEALER, BATTERY GOOD BUT NEEDED CHARGE. DEC11, 2020, IN DRIVEWAY, CAR WON'T START, AND CLICKING NOISE IN REAR POWER GATE, TOWED TO DEALER. BATTERY TESTED BAD, REPLACED. ALSO REPLACED PRG MODULE FOR REAR GATE. MAR 8, 2021, IN DRIVEWAY AT HOME, WON'T START. JUMPED AND DROVE TO DEALER...(THIS NEW BATTERY) CHARGED AND TESTED, FAILED, SO THEY REPLACED THE BATTERY, AGAIN. "PARASITIC DRAW TEST FOUND 45MA OF DRAW, BELOW MAXIMUM ALLOWABLE DRAW SPECIFICATION OF 70MA. VERIFIED CORRECT AND NORMAL OPERATION. TEST CODE:. K1GKF40-2FCL091"
NHTSA ODI #11404168
38,500 miles · Mar 20, 2021
Electrical System
WHEN THE CAR IS SHUT OFF, SOMETHING IS DRAINING THE BATTERY SO THAT IT VERY OFTEN DOES NOT START IN THE MORNING.
NHTSA ODI #11404018
50,000 miles · Mar 17, 2021
Electrical System
AFTER 2 YEARS OF USE, THE OEM BATTERY WAS NOT KEEPING THE CHARGE OR WAS DRAINING DUE TO AN ISSUE WITH THE ELECTRICAL SYSTEM. I HAD TO HAVE THE CAR JUMPED A COUPLE OF TIMES TO GET IT STARTED. BROUGHT THE CAR TO SUBARU DEALER AND THEY DID NOT FIND ANY ISSUES BUT REPLACED THE BATTERY WITH ANOTHER OEM BATTERY, QUITE UNUSUAL UNTIL I …
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AFTER 2 YEARS OF USE, THE OEM BATTERY WAS NOT KEEPING THE CHARGE OR WAS DRAINING DUE TO AN ISSUE WITH THE ELECTRICAL SYSTEM. I HAD TO HAVE THE CAR JUMPED A COUPLE OF TIMES TO GET IT STARTED. BROUGHT THE CAR TO SUBARU DEALER AND THEY DID NOT FIND ANY ISSUES BUT REPLACED THE BATTERY WITH ANOTHER OEM BATTERY, QUITE UNUSUAL UNTIL I READ AN ARTICALE ABOUT A CLASS ACTION SUIT AGAINST SUBARU. IN 2020, THE NEW OEM BATTERY WAS HAVING ISSUES REQUIRING I JUMP IT SEVERAL TIMES. I WAS AWAY FROM HOME AT THE TIME AND BROUGHT THE CAR TO ADVANCED AUTO PARTS. THEY TESTED THE 2ND OEM BATTERY AND ADVISED THE BATTERY WAS BAD AND NOT HOLDING THE CHARGE. AT THAT TIME I PURCHASED A DIEHARD BATTERY AND HAVE HAD NO ISSUES IN THE LAST 6 MONTHS. AS I STATED ABOVE, I HAVE READ THAT SUBARU IS IN A CLASS ACTION SUIT FOR THE EXACT ISSUE I HAD AND WANTED TO HAVE THIS ISSUE RECORDED.
NHTSA ODI #11403452
25,000 miles · Mar 16, 2021
Electrical System
BATTERY DIED LESS THAN 2 YEARS OLD. CAR WAS PARKED FOR ABOUT A WEEK AND WHEN I TRIED TO START IT IT WOULD NOT TURN OVER. TOOK TO DEALER AND THEY SAID THE BATTERY WAS DEAD.
NHTSA ODI #11403372
33,000 miles · Mar 16, 2021
Electrical System
I HAVE REPLACED THE BATTERY TWICE ON MY OWN SINCE I WAS TOLD THEY AREN'T COVERED UNDER WARRANTY. THE BATTERIES DISCHARGE ON THEIR OWN WHEN THE CAR IS PARKED. I HAVE TO USE A BATTERY CHARGER ALL THE TIME OR THE BATTERY IS DEAD WHEN I TRY TO START THE CAR. I PUT THE LAST BATTERY IN AROUND AUG 2020.
NHTSA ODI #11403322
Mileage unknown · Mar 16, 2021
Electrical System
DURING FIRST 3 YEARS OF OWNERSHIP OUR NEW CAR HAS FAILED TO START MANY TIMES AND EMERGENCY SERVICE CALLED TO JUMP START VEHICLE AS BATTERY WAS DISCHARGED AFTER POWER TRUNK OPENED WITHOUT ANY ACTIVATION WHILE PARKED IN OUR GARAGE. BATTERY DISCHARGED SEVERAL TIMES WITHOUT TRUNK ACTIVITY, SIMPLY PARKED OVERNIGHT IN OUR GARAGE WITH …
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DURING FIRST 3 YEARS OF OWNERSHIP OUR NEW CAR HAS FAILED TO START MANY TIMES AND EMERGENCY SERVICE CALLED TO JUMP START VEHICLE AS BATTERY WAS DISCHARGED AFTER POWER TRUNK OPENED WITHOUT ANY ACTIVATION WHILE PARKED IN OUR GARAGE. BATTERY DISCHARGED SEVERAL TIMES WITHOUT TRUNK ACTIVITY, SIMPLY PARKED OVERNIGHT IN OUR GARAGE WITH EVERYTHING ELECTRICAL CHECKED AND TURNED OFF. DEALER REPLACED BATTERY 4/20. BATTERY DISCHARGED AGAIN A COUPLE OF WEEKS AGO (3/06/2021) WHILE HAVING TRUNK OPEN TO CLEAN INSIDE OF CAR. VERY CONCERNED AS TO BEING STRANDED AGAIN DUE TO SAFETY..
NHTSA ODI #11403270
22,283 miles · Mar 16, 2021
Electrical System
VEHICLE'S BATTERY WENT DEAD AT ABOUT 22,283 MILES IN JAN OF 2020. BATTERY WOULD KEEP DYING EVEN AFTER PROPER JUMPING. VEHICLE WAS BROUGHT IN TO DEALERSHIP. DEALERSHIP ADVISED OF SOFTWARE ISSUE DRAINING THE BATTERY. I WAS ADVISED THAT THEY DID AN UPDATE AND REPLACED BATTERY. A YEAR LATER, VEHICLE IS HAVING BATTERY ISSUES AGAI…
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VEHICLE'S BATTERY WENT DEAD AT ABOUT 22,283 MILES IN JAN OF 2020. BATTERY WOULD KEEP DYING EVEN AFTER PROPER JUMPING. VEHICLE WAS BROUGHT IN TO DEALERSHIP. DEALERSHIP ADVISED OF SOFTWARE ISSUE DRAINING THE BATTERY. I WAS ADVISED THAT THEY DID AN UPDATE AND REPLACED BATTERY. A YEAR LATER, VEHICLE IS HAVING BATTERY ISSUES AGAIN (BATTERY KEPT DYING- MULTIPLE TIMES- EVEN AFTER DRIVING TO TRY TO "CHARGE" BATTERY). VEHICLE WAS BROUGHT INTO DEALERSHIP IN FEB 2021 AT 23,560 MILES. DIFFERENT STATEMENTS WERE MADE BY DEALERSHIP. I WAS TOLD THERE WAS AN ISSUE WITH THE VEHICLE ELECTRICAL SYSTEM NEEDING MORE POWER THAN THE BATTERY COULD PROVIDE. I WAS TOLD THEY HAD A SOLUTION, A BIGGER BATTERY. WHEN I PICKED UP MY CAR THEY JUST SWAPPED OUT THE BATTERY WITH THE SAME SIZE BATTERY. THEY DIDN'T TELL ME (TRIED TO HIDE IT). WHEN I CONFRONTED THEM, THEY ADVISED THAT SUBARU DIDN'T HAVE A FIX YET FOR THE DRAINING OF THE BATTERY. SUBARU SAYS I WILL JUST HAVE TO KEEP BRINGING IN MY VEHICLE EVERY TIME THERE IS AN ISSUE WITH THE BATTERY UNTIL THEY COME OUT WITH A FIX. PLEASE NOTE: SUBARU APPEARS TO TRY AND HIDE THE ELECTRICAL ISSUE. NONE OF THIS INFORMATION WAS ON MY SERVICE PAPER WORK AND THEY ONLY SPOKE ABOUT THE ELECTRICAL SYSTEM IN FEB 2021 AFTER I BROUGHT UP THE ISSUE AFTER READING FORUMS ON THE INTERNET ABOUT PEOPLE HAVING THE SAME ISSUE.
NHTSA ODI #11403256
15,000 miles · Mar 16, 2021
Electrical System
MY 2017 SUBARU OUTBACK 2.5I LIMITED BEGAN HAVING DEAD BATTERY ISSUES AT NEARLY 15,000 MILES. THE FIRST INCIDENT HAPPENED WHILE VISITING THE CHEROKEE NATIONAL FOREST. THE CAR WOULD NOT START AFTER WE RETURNED FROM A SHORT HIKE. IT LEFT US STRANDED AND FORCED TO WALK 4.5 MILES TO GAIN CELL SERVICE TO CALL FOR HELP. MY CAR NOW HAS …
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MY 2017 SUBARU OUTBACK 2.5I LIMITED BEGAN HAVING DEAD BATTERY ISSUES AT NEARLY 15,000 MILES. THE FIRST INCIDENT HAPPENED WHILE VISITING THE CHEROKEE NATIONAL FOREST. THE CAR WOULD NOT START AFTER WE RETURNED FROM A SHORT HIKE. IT LEFT US STRANDED AND FORCED TO WALK 4.5 MILES TO GAIN CELL SERVICE TO CALL FOR HELP. MY CAR NOW HAS 36,000 MILES AS OF 3/16/21 AND IS ON ITS THIRD BATTERY. THIS TIME I BOUGHT THE BEST BATTERY I COULD FIND AND AM HOPING FOR THE BEST. SOMETHING KEEPS DRAINING THE BATTERY, LEAVING ME IN ONE BIND AFTER ANOTHER. WITH NO HELP DIAGNOSING THE PROBLEM AT THE DEALERSHIP, WHAT MORE CAN I DO???
NHTSA ODI #11403254
13,777 miles · Mar 16, 2021
Electrical System
BATTERY APPEARS TO DRAIN OVER A RELATIVELY SHORT PERIOD OF TIME RESULTING IN: P1604 STARTABILITY MALFUNCTION, B2320 BACK &SIDE RADAR LOW VOLTAGE, C1413 ANTILOCK BRAKES VOLTAGE MALFUNCTION, B2500 POWER LIFT GATE VOLTAGE MALFUNCTION, B2A07 TELEMATICS BATTERY CHARGE HISTORY FAULT, B1011 BATTERY POWER SUPPLY CONTROL MALFUNCTION, B1…
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BATTERY APPEARS TO DRAIN OVER A RELATIVELY SHORT PERIOD OF TIME RESULTING IN: P1604 STARTABILITY MALFUNCTION, B2320 BACK &SIDE RADAR LOW VOLTAGE, C1413 ANTILOCK BRAKES VOLTAGE MALFUNCTION, B2500 POWER LIFT GATE VOLTAGE MALFUNCTION, B2A07 TELEMATICS BATTERY CHARGE HISTORY FAULT, B1011 BATTERY POWER SUPPLY CONTROL MALFUNCTION, B1013 IGNITION POWER SUPPLY FAILURE, AND B1014 ACCESSORY POWER SUPPLY FAILURE. ALL IS TAKING PLACE WHILE VEHICLE IS PARKED IN HEATED GARAGE.
NHTSA ODI #11403236
38,436 miles · Mar 16, 2021
Electrical System
BATTERY DIED TWICE WHEN CAR WAS INACTIVE FOR ONE WEEK. BOTH TIMES HAD TO REPLACE THE BATTERY.
NHTSA ODI #11403200
Official recalls
4Dec 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.
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.
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.
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
1EA21002 · 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.