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2009 Chevrolet Silverado 1500

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 2009 Chevrolet Silverado 1500 do not stand out strongly from the model-year median of 525.

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When problems were reported

Mileage at the reported incident

224 reports with mileage · 220 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 230 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Structure. Review the 54 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Electrical System. Review the 43 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

9 crash reports6 fire reports3 injury reports

Electrical System complaints

43 reports
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Mileage unknown · Feb 24, 2024
Air BagsElectrical SystemSeat Belts

My truck has roughly 26,000 miles and the airbag sensing module on it corroded due to water gathering around it in the acoustic padding. It happens because water runs down a line that enters the cab and gets absorbed by the acoustic padding. This is a known issue as there is a recall for other states. My state is not one even th…

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My truck has roughly 26,000 miles and the airbag sensing module on it corroded due to water gathering around it in the acoustic padding. It happens because water runs down a line that enters the cab and gets absorbed by the acoustic padding. This is a known issue as there is a recall for other states. My state is not one even though Louisiana is one of the wettest states and we also use salt in the winter when the roads ice. I’m glad I didn’t get hurt by this since it can cause the seatbelt pretentioners to fire and/or the airbag to deploy. This is the document from GM/NHTSA. GM Bulletin [XXX] [XXX] Can you please include Louisiana in this recall since the issue is affecting us? INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI #11573781

Mileage unknown · Aug 23, 2023
Electrical SystemPower TrainVehicle Speed Control

The TCM failed in rush hour traffic! In Minneapolis Minnesota, the stability control light came on, traction control light came on, no throttle, no power. We backed up traffic, got push to the side of the road, towed to the service shop, and was told the Transmission control module (TCM) failed. Then told they are on national…

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The TCM failed in rush hour traffic! In Minneapolis Minnesota, the stability control light came on, traction control light came on, no throttle, no power. We backed up traffic, got push to the side of the road, towed to the service shop, and was told the Transmission control module (TCM) failed. Then told they are on national backorder from GM. The truck has been down for 3 months with no answers or parts in sight.

NHTSA ODI #11540427

Mileage unknown · Jul 25, 2023
Air BagsElectrical SystemStructure

Smiths auto Canton ohio told me they sold it to me with no problems but the locks are going out it has a dent in the side that's getting worse. I had to buy breaks and a new starter twice.

NHTSA ODI #11534458

Mileage unknown · Mar 7, 2023
Electrical System

Bcm causing electrical problems with instrument cluster causing battery to go flat ... bcm not letting cluster goto sleep causing a battery drain around .5amps... all the gauges will drop below zero and bounce right back to zero in 30 seconds to a minute.

NHTSA ODI #11510613

Mileage unknown · Oct 5, 2022
Electrical SystemVehicle Speed Control

For the past few years I keep getting code P2138. I have spent several thousand dollars trying to get my truck fixed. I have replaced the accelerator pedal at least 3 times. Replaced the throttle body. Did a complete rewire. Replaced the ECM and still the dealership can’t figure it out. Every time I leave I’m hopeful the problem…

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For the past few years I keep getting code P2138. I have spent several thousand dollars trying to get my truck fixed. I have replaced the accelerator pedal at least 3 times. Replaced the throttle body. Did a complete rewire. Replaced the ECM and still the dealership can’t figure it out. Every time I leave I’m hopeful the problem is resolved but then a month or two later I will be driving and then my truck will lose engine power. Someone is going to get killed because of this if they haven’t already. Extremely frustrated.

NHTSA ODI #11488117

Mileage unknown · Jun 13, 2021
Electrical SystemWheels

I have had the Tire Pressure indicator that tells the tire pressure of all four tire replaced several times. John L Sullivan Chevrolet in Roseville California keeps telling me that they are wearing out do to use. But the truck only has 70K in mileage and I they malfunction all the time. I get readings of 99 lbs of air pressure. …

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I have had the Tire Pressure indicator that tells the tire pressure of all four tire replaced several times. John L Sullivan Chevrolet in Roseville California keeps telling me that they are wearing out do to use. But the truck only has 70K in mileage and I they malfunction all the time. I get readings of 99 lbs of air pressure. Then the same tire will say 0 lbs of pressure. And it will say 7, then 29 then 18 lbs of air pressure in a distance of 2 blocks traveled. This is a malfunction due to faulty parts in the GM tire pressure reading system and they need to fix it. If I take it to the Chevy dealer, they want to charge me $209 to per tire to replace them and then they still do not work after they replace them Still get crazy tire pressure readings and it warnings flashing on my instrument panel that are distracting and dangerous. It does not flashes every 5 seconds that I have a tire pressure issue and it needs to get resolved. But Chevrolet will not do anything but charge money of there problem with their truck part that is malfunctioning.

NHTSA ODI #11420730

158,000 miles · Nov 19, 2020
Electrical SystemService BrakesSteering

STEERING ANGLE SENSOR IS FAULTY. THIS IS AN INTEGRAL PART OF THE VEHICLE SAFETY SYSTEMS, INCLUDING ABS, AND TRACTION/ STABILITY CONTROL. HOW CAN THIS PART BE NO LONGER MANUFACTURED AFTER ONLY 9 YEARS? ALL SAFETY CONTROLS SHUT OFF WHILE VEHICLE IS IN MOTION.

NHTSA ODI #11375358

158,000 miles · Jun 4, 2020
Electrical SystemEngineExterior Lighting

FREQUENTLY WHEN DRIVING TRUCK WILL DO SOME OR ALL OF THE FOLLOWING THINGS, DOOR LOCKS LOCKING AND UNLOCKING, DASH LIGHTS FLASHING, STEREO COMING ON AND OFF, ELECTRONIC STABILITY CONTROL TURNS OFF, ALL LIGHTS, EXTERIOR AND INTERIOR, TURN OFF AND ON SOMETIMES STAYING OFF LONG ENOUGH AT NIGHT WILL SCARE YOU, TRUCK SPEEDS UP BUT THE…

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FREQUENTLY WHEN DRIVING TRUCK WILL DO SOME OR ALL OF THE FOLLOWING THINGS, DOOR LOCKS LOCKING AND UNLOCKING, DASH LIGHTS FLASHING, STEREO COMING ON AND OFF, ELECTRONIC STABILITY CONTROL TURNS OFF, ALL LIGHTS, EXTERIOR AND INTERIOR, TURN OFF AND ON SOMETIMES STAYING OFF LONG ENOUGH AT NIGHT WILL SCARE YOU, TRUCK SPEEDS UP BUT THEN SOMETIMES LOSING POWER. ALL OF THOSE THINGS HAPPEN WHEN THE TRUCK IS IN MOTION. I DRIVE ON THE HIGHWAY EVERY DAY WHICH IS BAD WHEN TRUCK DOES THESE THINGS. NOT A SAFE SITUATION FOR ME. THEN SOMETIMES WHEN YOU TURN IT OFF YOU HEAR A LOUD CLICKING NOISE. IF YOU DO NOTHING BATTERY WILL BE DEAD WHEN YOU TRY TO START IT NEXT TIME. I CAN GET IT TO STOP THE CLICKING BY RAISING HOOD I AND TAPPING ON POSITIVE BATTERY CAN I LET OR THE MEGA FUSE THAT IS ON THE FIREWALL. CHEVROLET HAS RECALLED THE 2008 TRUCKS FOR SOMETHING SIMILAR TO THIS. I *TR

NHTSA ODI #11327276

Mileage unknown · Mar 9, 2020
Electrical SystemEngine

THE WARNING SCREEN SHOWS: ENGINE HOT/ AC TURNED OFF, I HAVE BEEN REPLACED 4 TIMES THE TEMPERATURE SENSOR. IT WAS THE TEST DETECTED. IT WORKED ABOUT 3 MONTHS. LATER A TECH. TOLL ME, JUST RESET THE SYSTEM BY DISCONNECTING A BATTERY POLE, WORKS FOR A WHILE. 2 WEEKS AGO I REPLACED AGAIN THE TEMPERATURE SENSOR, AND AND THE THERMOSTAT…

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THE WARNING SCREEN SHOWS: ENGINE HOT/ AC TURNED OFF, I HAVE BEEN REPLACED 4 TIMES THE TEMPERATURE SENSOR. IT WAS THE TEST DETECTED. IT WORKED ABOUT 3 MONTHS. LATER A TECH. TOLL ME, JUST RESET THE SYSTEM BY DISCONNECTING A BATTERY POLE, WORKS FOR A WHILE. 2 WEEKS AGO I REPLACED AGAIN THE TEMPERATURE SENSOR, AND AND THE THERMOSTAT. I WORKED FOR 12 DAYS , AND NOW I HAVE THE SAME PROBLEM, BUT, EVEN WHEN I RESET THE IT IT WORKS FOR NOT MORE THAN 10 MINUTES, AND THE " ENGINE HOT/ AC OFF SHOWS AGAIN.

NHTSA ODI #11317048

40,000 miles · Mar 13, 2019
Electrical System

ENGINE DOESN'T START. RARE AND INTERMITTENT. NO CLICKS OR ATTEMPT TO START, LIGHTS ARE ON AND GO OFF WHEN KEY TURNED TO START. NOTHING APPEARS TO HELP IE MOVING DRIVE SELECTOR, ENGAGING/RELEASING E-BRAKE, STEPPING ON BRAKE PEDAL, OPENING/CLOSING HOOD ETC WAIT SOME UNKNOWN PERIOD OF TIME, MORE THAN 10 MINUTES AND IT STARTS AS …

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ENGINE DOESN'T START. RARE AND INTERMITTENT. NO CLICKS OR ATTEMPT TO START, LIGHTS ARE ON AND GO OFF WHEN KEY TURNED TO START. NOTHING APPEARS TO HELP IE MOVING DRIVE SELECTOR, ENGAGING/RELEASING E-BRAKE, STEPPING ON BRAKE PEDAL, OPENING/CLOSING HOOD ETC WAIT SOME UNKNOWN PERIOD OF TIME, MORE THAN 10 MINUTES AND IT STARTS AS THOUGH NOTHING EVER HAPPENED. I'VE LOOKED INTO IT ONLINE ENOUGH TO KNOW OTHERS HAVE SIMILAR PROBLEMS BUT HAVEN'T FOUND A SOLUTION. MAYBE NOT BE AS SAFETY RELATED AS IS NEEDED BUT I CAN THINK OF A FEW SCENARIOS THAT COULD BE DANGEROUS. THANKS

NHTSA ODI #11186647

Official recalls

3

21V050000 · Air Bags:frontal:passenger Side:inflator Module

Feb 5, 2021

General Motors, LLC (GM) is recalling certain 2007-2011 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, Yukon XL, and 2009-2011 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500 and Sierra 3500 vehicles originally sold, or ever registered, in the states of 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, GM is recalling certain 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, Yukon XL vehicles originally sold, or ever registered, in the states of 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." These vehicles are equipped with non-desiccated passenger frontal inflators containing phase-stabilized ammonium nitrate (PSAN) propellant. These inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high 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: GM will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. Interim letters notifying owners of the safety risk were mailed on February 22, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed on March 1, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020; Cadillac customer service at 1-800-458-8006; and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328760.

21V052000 · Air Bags:frontal:passenger Side:inflator Module

Feb 5, 2021

General Motors, LLC (GM) is recalling certain 2009 Cadillac Escalade, Escalade ESV, Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500, Sierra 3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of 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, GM is recalling certain 2007-2008 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of 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 or "Zone C." These vehicles are equipped with non-desiccated passenger frontal inflators containing phase-stabilized ammonium nitrate (PSAN) propellant. These inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high 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: GM will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. Interim letters notifying owners of the safety risk were mailed on February 23, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed on September 20, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020, Cadillac customer service at 1-800-458-8006, and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328780.

21V053000 · Air Bags:frontal:passenger Side:inflator Module

Feb 5, 2021

General Motors, LLC (GM) is recalling certain 2013 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of 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, GM is recalling certain 2010 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and Yukon XL vehicles originally sold, or ever registered in the states of 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, GM is recalling certain 2009 Cadillac Escalade, Escalade ESV, and Escalade EXT, Chevrolet Avalanche, Silverado 1500, Silverado 2500/3500, Suburban, Tahoe, GMC Sierra 1500, Sierra 2500/3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of 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 or "Zone C."

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: GM will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. Interim letters notifying owners of the safety risk were mailed on February 24, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed on May 11, 2021. Owners may contact Cadillac customer service at 1-800-458-8006; Chevrolet customer service at 1-800-222-1020; and GMC customer service at 1-800-462-8782. GM's number for this recall is N212328790.

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

2

DP22005 · Pedestrian Alert Sounds

Opened Jan 27, 2023 · Closed Aug 7, 2023

Status: closed (inferred from source dates) · Electrical System:propulsion System

NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matter described in the petition. On June 24, 2023 and as supplemented on June 25, 2023, the petitioner notified NHTSA he was withdrawing his petition. The petitioner indicated that, based on his review of data, there is no justification for asserting potential benefits that could be derived from actions sought by my petition. Based on the petitioner's withdrawal, DP22-005 is closed. Closure of this DP does not represent a determination by NHTSA regarding the subject matter of the petition.

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.