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2013 Chevrolet Silverado 3500

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 2013 Chevrolet Silverado 3500 do not stand out strongly from the model-year median of 35.

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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

21 reports with mileage · 5 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.

  • Steering. Review the 7 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. 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 →

NHTSA owner reports · September 18, 2026 snapshot.

1 crash reports1 fire reports1 injury reports

Steering complaints

7 reports
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33,000 miles · May 1, 2017
Steering

STEERING HAS LOCKED UP MOMENTARILY WHILE TURNING AT LOW SPEED INTO A PARKING LOT. THIS HAS HAPPENED NUMEROUS TIMES, BUT IT IS VERY BRIEF. RECENTLY IT HAS HAPPENED SEVERAL TIMES WHILE DRIVING IN DEEP SNOW IN THE MOUNTAINS IN FOUR WHEEL DRIVE. IT COMPLETELY LOCKS UP FOR A SECOND OR SO THEN BREAKS FREE. IT IS NOT TO BE CONFUSED …

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STEERING HAS LOCKED UP MOMENTARILY WHILE TURNING AT LOW SPEED INTO A PARKING LOT. THIS HAS HAPPENED NUMEROUS TIMES, BUT IT IS VERY BRIEF. RECENTLY IT HAS HAPPENED SEVERAL TIMES WHILE DRIVING IN DEEP SNOW IN THE MOUNTAINS IN FOUR WHEEL DRIVE. IT COMPLETELY LOCKS UP FOR A SECOND OR SO THEN BREAKS FREE. IT IS NOT TO BE CONFUSED WITH BECOMING DIFFICULT TO STEER, AS IF THE POWER STEERING BELT IS SLIPPING - NO IT COMPLETELY LOCKS UP. NO NOISE IS PRESENT WHEN THIS HAPPENS. NO SQUEALING BELTS, NO GRINDING - NO DIFFERENT NOISE OF ANY KIND. IT JUST LOCKS UP, THEN BREAKS FREE. SINCE IT HAPPENS MOMENTARILY, IT IS VERY DIFFICULT TO INVESTIGATE OR DUPLICATE. THIS HAS HAPPENED NUMEROUS TIMES SINCE THE TRUCK WAS BRAND NEW.

NHTSA ODI #10981605

98,000 miles · Oct 13, 2015
Steering

WHEN MAKING TURNS AT SLOW SPEEDS THE STEERING RANDOMLY SEEMS TO LOCK-UP AND I HAVE TO PUT MY FULL STRENTGH INTO THE STEERING WHEEL TO GET THE TRUCK TO TURN. IT WILL ONLY HAPPEN FOR A SPLIT SECOND AND THEN ACT NORMALLY. BUT IT HAS CAUSED ME TO ALMOST HAVE SEVERAL COLLISIONS WITH OTHER VEHICLES. IT HAS BEEN HAPPENING SINCE THE VEH…

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WHEN MAKING TURNS AT SLOW SPEEDS THE STEERING RANDOMLY SEEMS TO LOCK-UP AND I HAVE TO PUT MY FULL STRENTGH INTO THE STEERING WHEEL TO GET THE TRUCK TO TURN. IT WILL ONLY HAPPEN FOR A SPLIT SECOND AND THEN ACT NORMALLY. BUT IT HAS CAUSED ME TO ALMOST HAVE SEVERAL COLLISIONS WITH OTHER VEHICLES. IT HAS BEEN HAPPENING SINCE THE VEHICLE WAS NEW BUT SEEMS TO BE PROGRESSIVELY HAPPENING MORE OFTEN, I HAVE TAKEN THE VEHICLE TO THE DEALERSHIP WHERE I PURCHASED THE TRUCK BUT THEY CAN NOT FIND ANY PROBLEMS NOR CAN THEY GET THE VEHICLE TO REPLICATE THE PROBLEM. ALSO--IT SEEMS TO HAPPEN MORE WHEN I AM TURNING TO THE RIGHT,

NHTSA ODI #10781869

100,000 miles · Aug 25, 2015
Steering

TL* THE CONTACT OWNS A 2013 CHEVROLET SILVERADO 3500. WHILE MAKING A RIGHT TURN AT APPROXIMATELY 5 MPH, THE STEERING WHEEL BECAME DIFFICULT TO MANEUVER WITHOUT WARNING INTERMITTENTLY. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, BUT THE FAILURE WAS UNABLE TO BE DIAGNOSED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. TH…

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TL* THE CONTACT OWNS A 2013 CHEVROLET SILVERADO 3500. WHILE MAKING A RIGHT TURN AT APPROXIMATELY 5 MPH, THE STEERING WHEEL BECAME DIFFICULT TO MANEUVER WITHOUT WARNING INTERMITTENTLY. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, BUT THE FAILURE WAS UNABLE TO BE DIAGNOSED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 100,000. THE VIN WAS UNAVAILABLE.

NHTSA ODI #10759057

6,000 miles · Sep 29, 2014
Steering

WHEN DRIVING AT SLOW SPEED AND USUALLY AT LOW RPM, AND TURNING RIGHT THE STEERING LOCKS UP, IF I PULL TO THE LEFT IT USUALLY CLEARS THE LOCK UP. THIS PROBLEM OCCURS NEARLY EVERY TIME I DRIVE THIS VEHICLE, AND ITS NOT GETTING BETTER. I TOOK THE TRUCK TO THE DEALER TO HAVE IT CHECKED OUT AND WAS TOLD THAT IT IS NORMAL AND THERE WA…

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WHEN DRIVING AT SLOW SPEED AND USUALLY AT LOW RPM, AND TURNING RIGHT THE STEERING LOCKS UP, IF I PULL TO THE LEFT IT USUALLY CLEARS THE LOCK UP. THIS PROBLEM OCCURS NEARLY EVERY TIME I DRIVE THIS VEHICLE, AND ITS NOT GETTING BETTER. I TOOK THE TRUCK TO THE DEALER TO HAVE IT CHECKED OUT AND WAS TOLD THAT IT IS NORMAL AND THERE WAS NOTHING THEY WOULD DO ABOUT IT. I SAY THERE IS NOTHING NORMAL ABOUT NEARLY HITTING OTHER VEHICLES BECAUSE OF POWER STEERING PROBLEM UNLESS OF COURSE ITS A GM PRODUCT AND HAVING A DEFECT LIKE THIS IS NORMAL FOR THEM. *TR

NHTSA ODI #10639895

200 miles · Jul 1, 2014
Steering

I DRIVE A 2013 CHEVY SIVERODO 3500HD, DIESEL. I HAVE HAD SEVERAL INCIDENTS. THE FIRST ABOUT A YEAR AGO, TURNING SHARPLY AS I WAS BACKING OUT OF THE DRIVEWAY, THE POWER STEERING SEEMED TO QUIT FUNCTIONING MAKING IT VERY DIFFICULT TO TURN THE WHEEL. THE SECOND TIME WAS SHORTLY AFTER WHILE PULLING INTO A PARKING STALL AT A MARKET…

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I DRIVE A 2013 CHEVY SIVERODO 3500HD, DIESEL. I HAVE HAD SEVERAL INCIDENTS. THE FIRST ABOUT A YEAR AGO, TURNING SHARPLY AS I WAS BACKING OUT OF THE DRIVEWAY, THE POWER STEERING SEEMED TO QUIT FUNCTIONING MAKING IT VERY DIFFICULT TO TURN THE WHEEL. THE SECOND TIME WAS SHORTLY AFTER WHILE PULLING INTO A PARKING STALL AT A MARKET. THE SAME THING HAPPENED.IT HAS HAPPENED COUNTLESS TIMES SINCE THEN. I TOOK THE TRUCK INTO THE LOCAL CHEVY DEALER TO HAVE THIS CHECKED OUT, BUT THEY WERE NOT ABLE TO FIND ANYTHING. I TOW A 5TH WHEEL TRAILER MOST OF THE TIME AND AM CONCERNED THAT THE STEERING MAY FREEZE UP AT HIGHER SPEEDS WHILE TRAVELING. IT SEEMS TO OCCUR AT LOWER SPEEDS LIKE THE POWER STEERING PUMP HAS ISSUES. *TR

NHTSA ODI #10607316

12,500 miles · Apr 2, 2014
Steering

I DRIVE A 2013 CHEVY SILVERADO 3500HD, DIESEL. I HAVE HAD TWO INCIDENTS. THE FIRST ABOUT A MONTH OR TWO AGO, TURNING SHARPLY AS I WAS BACKING OUT OF THE DRIVEWAY, THE POWER STEERING SEEMED TO QUIT FUNCTIONING MAKING IT VERY DIFFICULT TO TURN THE WHEEL. THE SECOND TIME WAS LAST WEEK WHILE PULLING INTO A PARKING STALL AT A MAR…

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I DRIVE A 2013 CHEVY SILVERADO 3500HD, DIESEL. I HAVE HAD TWO INCIDENTS. THE FIRST ABOUT A MONTH OR TWO AGO, TURNING SHARPLY AS I WAS BACKING OUT OF THE DRIVEWAY, THE POWER STEERING SEEMED TO QUIT FUNCTIONING MAKING IT VERY DIFFICULT TO TURN THE WHEEL. THE SECOND TIME WAS LAST WEEK WHILE PULLING INTO A PARKING STALL AT A MARKET. THE SAME THING HAPPENED. I TOOK THE TRUCK INTO THE LOCAL CHEVY DEALER TODAY TO HAVE THIS CHECKED OUT, BUT THEY WERE NOT ABLE TO FIND ANYTHING. I TOW A 5TH WHEEL TRAILER ABOUT ONCE A MONTH AND AM CONCERNED THAT THE STEERING MAY FREEZE UP AT HIGHER SPEEDS WHILE TRAVELING. *TR

NHTSA ODI #10576953

3,400 miles · Jun 24, 2013
Steering

TL* THE CONTACT OWNS A 2013 CHEVROLET SILVERADO. THE CONTACT STATED WHILE DRIVING APPROXIMATELY 35 MPH THE STEERING WHEEL BEGAN SHAKING VIGOROUSLY FROM LEFT TO RIGHT. THE VEHICLE WAS TAKEN TO THE DEALER TWICE DIAGNOSIS. THE TECHNICIAN WAS UNABLE TO DIAGNOSE THE FAILURE. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE VEH…

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TL* THE CONTACT OWNS A 2013 CHEVROLET SILVERADO. THE CONTACT STATED WHILE DRIVING APPROXIMATELY 35 MPH THE STEERING WHEEL BEGAN SHAKING VIGOROUSLY FROM LEFT TO RIGHT. THE VEHICLE WAS TAKEN TO THE DEALER TWICE DIAGNOSIS. THE TECHNICIAN WAS UNABLE TO DIAGNOSE THE FAILURE. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE APPROXIMATE FAILURE MILEAGE WAS 3,400. *TR

NHTSA ODI #10521380

Official recalls

4

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.

21V054000 · Air Bags:frontal:passenger Side:inflator Module

Feb 5, 2021

General Motors, LLC (GM) is recalling certain 2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, and Yukon XL vehicles originally sold, or ever registered, in the states of AL, CA, FL, GA, HI, LA, MS, SC, TX, PR, AS, GU, the MP, and VI or "Zone A." Additionally GM is recalling certain 2011-2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, Yukon XL and 2011-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Silverado 1500, and GMC Sierra 1500 vehicles originally sold, or ever registered, in the states of AZ, AR, DE, DC, IL, IN, KS, KY, MD, MO, NE, NV, NJ, NM, NC, OH, OK, PA, TN, VA, and WV or "Zone B." Additionally, GM is recalling certain 2010-2014 Cadillac Escalade, Escalade ESV, Chevrolet Silverado 2500, Silverado 3500, Suburban, Tahoe, GMC Sierra 2500, Sierra 3500, Yukon, and Yukon XL and 2010-2013 Cadillac Escalade EXT, Chevrolet Avalanche, Silverado 1500, and GMC Sierra 1500 vehicles originally sold, or ever registered, in the states of AK, CO, CT, ID, IA, ME, MA, MI, MN, MT, NH, NY, ND, OR, RI, SD, UT, VT, WA, WI, and WY 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 25, 2021. Second notification letters will be mailed once the remedy is available. Owner notification letters were mailed to 40 VIN owners on May 11, 2021. A second owner notification letter was mailed to all other owners on January 24, 2022. 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 N212328800.

18V267000 · Equipment

Apr 26, 2018

General Motors LLC (GM) is recalling certain 2009-2014 Chevrolet Silverado HD and GMC Sierra HD, 2009 GMC Topkick 5000, 6000, 7000 and 8000 Series and Isuzu F Series, and 2009-2018 Chevrolet Express, and GMC Savana vehicles, equipped with certain Plastic-Handle Fire Extinguishers or Push Button 'Pindicator' Fire Extinguishers. These extinguishers may become clogged, preventing the extinguisher from discharging as expected or requiring excessive force to activate the extinguisher. Additionally, in certain models, the nozzle may detach from the valve assembly with enough force that it could cause injury and also render the product inoperable. For a full list of the affected fire extinguisher models visit: https://static.nhtsa.gov/odi/rcl/2017/RMISC-17E062-5427.pdf

Consequence & remedy

Consequence: In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.

Remedy: GM will notify owners, instructing them to contact Kidde to get a replacement fire extinguisher, free of charge. The recall began June 11, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020, GMC customer service at 1-800-462-8782, and Isuzu customer service at 1-866-441-9638. GM's number for this recall is 18146.

17V664000 · Fuel System, Gasoline:storage:auxillary Tank

Oct 19, 2017

General Motors LLC (GM) is recalling certain 2011-2015 Chevrolet Silverado 3500 and GMC Sierra 3500 trucks equipped with dual fuel tanks. The low fuel level sensor for the front tank may stick causing the rear tank to overfill the front tank.

Consequence & remedy

Consequence: If the front tank overfills, the excess pressure may cause the front tank to expand and contact the driveshaft, possibly resulting in a hole in the tank. The hole will leak fuel, which in the presence of an ignition source, can increase the risk of a fire.

Remedy: GM has notified owners, and dealers will replace the rear tank fuel pump or update the fuel-level sensor software, as well as inspect the front tank, replacing it as necessary, free of charge. The recall began December 11, 2017. Owners may contact GM customer service for Chevrolet 1-800-222-1020 or for GMC customer service at 1-800-462-8782. GM's number for this recall is 17399.

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.