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2008 Honda Pilot

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 2008 Honda Pilot do not stand out strongly from the model-year median of 239.5.

About this comparison →

When problems were reported

Mileage at the reported incident

71 reports with mileage · 62 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.

  • Air Bags. Review the 32 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Structure. Review the 16 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 11 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

11 crash reports3 fire reports7 injury reports

What owners actually said

133 reports
Mileage unknown · Aug 14, 2026
Suspension

Frame completely rusted through, multiple holes found in the frame. This is a death trap!

NHTSA ODI #11756874

Mileage unknown · Mar 30, 2026
Suspension

Referring to my 2008 Honda Pilot, as I was pulling into my driveway I heard a very loud bang in the rear area of my vehicle. When I looked underneath the vehicle I could see the rear subframe had rusted through and detached. This is my main vehicle that I use on a daily basis to provide rides to family members. 3 weeks before…

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Referring to my 2008 Honda Pilot, as I was pulling into my driveway I heard a very loud bang in the rear area of my vehicle. When I looked underneath the vehicle I could see the rear subframe had rusted through and detached. This is my main vehicle that I use on a daily basis to provide rides to family members. 3 weeks before this happened I had 7 people in this car that I drove approximately 30 miles one way which had us on the highway doing 70 mph. Please note that is the speed limit on that highway. Had the subframe broke off at that time it would have been catastrophic. Honda America requested I have it towed to the nearest Honda dealer to diagnose it. It happened on March 11, 2026 and was towed to the dealer that same day, with an appointment to be looked at on Friday March 13, 2026. The dealer diagnosed the subframe detached due to rust and had notified Honda America of this fact. Honda America just notified me today (Monday, March 30, 2026) that they will not assist me in anyway as this particular model Honda has not been recalled or is the result of any defects. There was no prior warning light to warn me.

NHTSA ODI #11728082

Mileage unknown · Jan 10, 2026
Suspension

I could hear a loud grinding noise while driving and the rear of the truck felt like it was driving without any type of suspension. Any bump or slight imperfection in the roadway felt like metal banging and a severe thump could be felt inside the vehicle. The front of the vehicle felt fine but the rear felt extremely strange and…

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I could hear a loud grinding noise while driving and the rear of the truck felt like it was driving without any type of suspension. Any bump or slight imperfection in the roadway felt like metal banging and a severe thump could be felt inside the vehicle. The front of the vehicle felt fine but the rear felt extremely strange and unstable.

NHTSA ODI #11710110

Mileage unknown · Oct 4, 2025
Service Brakes

the VSA and danger triangle lights are on

NHTSA ODI #11691352

Mileage unknown · Sep 18, 2025
Suspension

Rear Subframe Body Mount Rust

NHTSA ODI #11688255

Mileage unknown · Aug 26, 2025
Suspension

Had vehicle in for state inspection and was told the rear crossmember where the rear wheel assembly bolts into was rusting and should be fixed immediately.

NHTSA ODI #11683074

Mileage unknown · Nov 6, 2024
Unknown Or Other

Failure of Honda Pilot OEM jack. On 11/04/24 I was jacking up the right rear wheel of my 2008 Honda Pilot when the OEM scissor jack I was using suddenly and loudly broke, allowing the wheel to come down violently. Note that I was jacking the vehicle on a firm, level surface, using the reinforced jacking point as instructed…

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Failure of Honda Pilot OEM jack. On 11/04/24 I was jacking up the right rear wheel of my 2008 Honda Pilot when the OEM scissor jack I was using suddenly and loudly broke, allowing the wheel to come down violently. Note that I was jacking the vehicle on a firm, level surface, using the reinforced jacking point as instructed in the vehicle manual, and that the vehicle did NOT fall off of the jack; the jack simply broke. I removed the jack from under the vehicle and inspected and tested it. The threaded rod in the jack would no longer turn smoothly and when testing the jack, it would not lift any weight without falling back down. Summary: Failure of 2008 Honda Pilot jack Failure did put me at risk when jacked wheel suddenly fell. Jack has not been inspected or tested by dealer, etc, Jack failed without warning. Incident not reported to police, insurance, etc. Jack IS available for inspection.

NHTSA ODI #11623768

Mileage unknown · Jun 18, 2024
Tires

Hello, I have a set of 4 Bridgestone Dueler LX tires that have been cracking for the past 8 months and now appear to be separating in between the treads. I’ve had America’s Tire Company look at them within the past 6 months and they always seem to state that it’s normal, but the cracks seem to be getting bigger and bigger. The w…

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Hello, I have a set of 4 Bridgestone Dueler LX tires that have been cracking for the past 8 months and now appear to be separating in between the treads. I’ve had America’s Tire Company look at them within the past 6 months and they always seem to state that it’s normal, but the cracks seem to be getting bigger and bigger. The wheels vibrate some, even after several re-balancing attempts. The tires were purchased on [XXX] and I don’t feel safe driving on these tires anymore to the point that I really hesitate driving on the freeway now for that they might fail/explode. I will be submitting a call/claim directly with Bridgestone at 800-847-3272 tomorrow as well. The tire size is P235/70R 16. There has been no incident yet, so I will use today's date. Of the photos uploaded, IMG's 3506 and 3507 were recently placed in the rear and IMG 3508 are in the back. Here are the DOT #'s in no particular order: [XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI #11595210

Mileage unknown · Nov 20, 2023
Electrical SystemExterior Lighting

Left headlight went out in July 2023 while traveling in Oklahoma. I had it replaced at a NAPA shop in Kansas shortly after. The headlight went out again while home in Charleston, SC in November 2023. I had it replaced again. 2 weeks later around roughly November 15th 2023 the light went out again.

NHTSA ODI #11556052

Mileage unknown · Jun 11, 2023
Structure

When in the service garage for a noise, our independent service mechanic confirmed that the body of the Pilot has rusted from the frame.

NHTSA ODI #11526467

Official recalls

7

19V499000 · Air Bags:frontal:driver Side:inflator Module

Jun 27, 2019

Honda (American Honda Motor Co.) is recalling certain 2003 Acura 3.2CL, 2002-2003 3.2TL, 2003-2006 MDX, 2001-2007 Honda Accord, 2001-2005 Civic, 2003-2005 Civic Hybrid, 2001-2005 Civic GX NGV, 2002-2006 CR-V, 2003-2011 Element, 2002-2004 Odyssey, 2003-2008 Pilot and 2006 Ridgeline vehicles. These vehicles are equipped with driver frontal air bag inflators assembled as a recall remedy part or replacement service part, that may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.

Consequence & remedy

Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the driver frontal air bag inflator, free of charge. The recall began August 12, 2019. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are Q5A and Y58.

19V501000 · Air Bags:frontal:passenger Side:inflator Module

Jun 27, 2019

Honda (American Honda Motor Co.) is recalling certain 2003-2006 Acura MDX, 2005-2012 RL, 2003-2007 Honda Accord, 2001-2005 Civic, 2003-2005 Civic Hybrid, 2001-2005 Civic GX NGV, 2002-2006 CR-V, 2003-2011 Element, 2007-2008 Fit, 2002-2004 Odyssey, 2003-2008 Pilot, and 2006-2014 Ridgeline vehicles. The vehicles are equipped with passenger frontal air bag inflators assembled as a recall remedy part or replacement service part, that may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.

Consequence & remedy

Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the passenger frontal airbag inflator, free of charge. The recall began August 12, 2019. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are E5D and X5C.

19V182000 · Air Bags:frontal:driver Side:inflator Module

Mar 6, 2019

Honda (American Honda Motor Co.) is recalling specific 2003 Acura 3.2CL, 2013-2016 ILX, 2013-2014 ILX Hybrid, 2003-2006 MDX, 2007-2016 RDX, 2002-2003 3.2TL, 2004-2006, and 2009-2014 TL, 2010-2013 ZDX and 2001-2007 and 2009 Honda Accord, 2001-2005 Civic, 2003-2005 Civic Hybrid, 2001-2005 Civic GX NGV, 2002-2007 and 2010-2011 CR-V, 2003-2011 Element, 2007 Fit, 2002-2004 Odyssey, 2003-2008 Pilot, and 2006-2014 Ridgeline vehicles. The affected vehicles received a replacement driver air bag inflator as part of a previous Takata inflator recall remedy or a replacement driver air bag module containing the same inflator type as a service part. Due to a manufacturing error, in the event of a crash necessitating deployment of the driver frontal air bag, these inflators may explode.

Consequence & remedy

Consequence: An explosion of an inflator within the driver frontal air bag module may result in sharp metal fragments striking the driver, front seat passenger or other occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the driver's air bag inflator with an alternate inflator, free of charge. The recall began April 10, 2019. Honda owners may contact customer service at 1-888-234-2138. Honda's number for this recall is O41. Acura owners may contact customer service at 1-888-234-2138. Acura's number for this recall is U40.

18V268000 · Air Bags:frontal:passenger Side:inflator Module

Apr 26, 2018

Honda (American Honda Motor Co.) is recalling certain 2003-2012 Honda Accord and Pilot, 2010 Accord Crosstour, 2001-2011 Civic, 2002-2011 CR-V, 2003-2004, 2006-2008 and 2011 Element, 2007 and 2009-2013 Fit, 2010-2012 Insight, 2002-2004 Odyssey, and 2012 Ridgeline vehicles. The front passenger air bag may have been installed incorrectly during replacement.

Consequence & remedy

Consequence: An incorrectly installed air bag may deploy improperly in the event of a crash, increasing the risk of injury.

Remedy: Honda will notify owners, and dealers will inspect and, if necessary, replace the passenger frontal air bag module assembly, free of charge. The recall began June 22, 2018. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are K1P, and M1O.

17V029000 · Air Bags:frontal:passenger Side:inflator Module

Jan 10, 2017

Honda (American Honda Motor Co.) is recalling certain 2005-2006 Acura MDX and Honda CR-V vehicles, 2005-2011 Honda Element vehicles, 2005-2012 Acura RL vehicles, 2006-2012 Honda Ridgeline vehicles, 2007-2008 Honda Fit vehicles and 2005-2008 Honda Pilot vehicles originally sold, or ever registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands, or "Zone A." Additionally, if not included in "Zone A" above, Honda is recalling certain 2005-2006 Acura MDX and Honda CR-V vehicles, 2005-2009 Acura RL and Honda Element vehicles, 2007-2008 Honda Fit vehicles, 2005-2008 Honda Pilot vehicles and 2006-2009 Honda Ridgeline vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Additionally, if not included in "Zone A" or "Zone B" above, Honda is recalling certain 2005-2006 Acura MDX and Honda CR-V vehicles, 2005-2008 Acura RL, Honda Element and Honda Pilot vehicles, 2007-2008 Honda Fit vehicles and 2006-2008 Honda Ridgeline vehicles originally sold, or ever registered in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Consequence & remedy

Consequence: An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the front passenger air bag inflator, free of charge. The recall bagan March 2017. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are KD9 and KE0.

16V344000 · Air Bags:frontal:passenger Side:inflator Module

May 23, 2016

Honda (American Honda Motor Co.) is recalling certain model year 2003-2006 Acura MDX, 2005-2011 Acura RL, 2005-2006 Honda CR-V, 2003-2011 Element, 2007-2008 Fit, 2003-2008 Pilot, 2002-2004 Odyssey, and 2006-2011 Ridgeline vehicles originally sold, or that have ever been registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands, or "Zone A." Additionally, unless included in "Zone A" above, Honda is recalling certain model year 2003-2006 Acura MDX, 2005-2008 Acura RL, 2005-2006 Honda CR-V, 2003-2008 Element, 2007-2008 Fit, 2003-2008 Pilot, 2002-2004 Odyssey, and 2006-2008 Ridgeline vehicles originally sold, or that have ever been registered, in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Lastly, unless included in "Zone A" or "Zone B" above, Honda is recalling model year 2002-2004 Odyssey and model year 2003-2004 Acura MDX, Honda Element, and Honda Pilot vehicles originally sold, or registered, in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Consequence & remedy

Consequence: An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the passenger frontal air bag inflator, free of charge. The recall began June 27, 2016. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are KA0, KA1, KA2, and KA3.

15V320000 · Air Bags:frontal:driver Side:inflator Module

May 28, 2015

Honda (American Honda Motor Co.) is recalling certain model year 2001-2007 Accord, 2001-2005 Civic, 2001-2004 Honda Civic GX, 2003-2005 Honda Civic Hybrid, 2002-2006 CR-V, 2003-2011 Element, 2002-2004 Odyssey, 2003-2008 Pilot, 2006 Ridgeline, 2003 Acura 3.2CL, 2003-2006 Acura MDX, and 2002-2003 Acura 3.2TL vehicles. The affected vehicles are equipped with a dual-stage driver frontal air bag that may be susceptible to moisture intrusion and other factors, including manufacturing variability that, over time, could cause the inflator to rupture.

Consequence & remedy

Consequence: In the event of a crash necessitating deployment of the driver's frontal air bag, the inflator could rupture with metal fragments striking the driver or other occupants resulting in serious injury or death.

Remedy: Honda will notify owners, and dealers will replace the driver frontal air bag inflator, free of charge. The recall began on July 1, 2015. Owners may contact Honda customer service at 1-888-234-2138. Owners may contact Acura customer service at 1-800-382-2238, select option 4. Note: Vehicles that have had their driver frontal air bag replaced previously as part of a recall remedy prior to September 12, 2014 need to have their air bag replaced under this recall as well. Vehicles that, on or after September 12, 2014, received a remedy for a prior driver frontal air bag inflator recall already received an inflator of a different design, and therefore are not included in this recall and do not require additional servicing. Note: This recall fully supersedes recalls 08V-593, 09V-259, 10V-041, 11V-260, 14V-351 and 15V-153. Honda's numbers for this recall are JQ9, JR0, JR1, JR2, JR3, JR4, JR5, JR6, JR7, and JR8.

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.