# NHTSA recall 21V496000 A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups. - Published by: NHTSA \(United States\) - Campaign number: 21V496000 - Manufacturer's number: N212329840 - Manufacturer: General Motors, LLC - Reported: 2021\-07\-01 - Owners notified: 2022\-04\-04 - Component: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER - Units potentially affected: 338020 - Part numbers: 12681380, 12705875, 19419326, 84303149 ## What is wrong General Motors, LLC \(GM\) is recalling certain 2017\-2019 Chevrolet Silverado 2500, 3500 and 2017\-2019 GMC Sierra 2500 and 3500 vehicles equipped with a Duramax diesel 6.6 liter engine and an optional engine\-block heater cord. An electrical short\-circuit may occur in the engine\-block heater cable or in the terminals that connect the heater cable to the block heater. ## What can happen An electrical short\-circuit can increase the risk of a fire. ## The remedy Dealers will replace engine block heaters and heater cords. Vehicles that have this feature disabled as a remedy to the safety condition will be contacted and offered replacement block heaters and heater cords under a separate customer satisfaction program, free of charge. GM will provide free replacement block heaters and cords under a separate customer satisfaction campaign. For vehicles previously included in recall 19V\-328, the heater cord will be replaced and rerouted, free of charge. Interim owner notifications were mailed on August 13, 2021. Owner notification letters are expected to be mailed on April 4, 2022. Customers may call GMC customer service at 1\-800\-462\-8782. GM's number for this recall is 212329840. ## Notes Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1\-888\-327\-4236 \(TTY 1\-800\-424\-9153\), or go to www.nhtsa.gov. ## Remedy progress the manufacturer reported - Report: Annual report 2, for 2025 quarter 2 to 2026 quarter 1 - Filed with NHTSA: 2026\-04\-10 - Vehicles in the campaign: 338020 - Reported remedied: 272700 \(80%\) - Reported unreachable: 1310 - Reported removed: 43 These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 1, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026\-10\-19. ## Vehicles this campaign lists - [2017 CHEVROLET SILVERADO 2500](/makes/chevrolet/silverado/2017/recalls.md). Listed as a series or trim of this model. - [2018 CHEVROLET SILVERADO 2500](/makes/chevrolet/silverado/2018/recalls.md). Listed as a series or trim of this model. - [2019 CHEVROLET SILVERADO 2500](/makes/chevrolet/silverado/2019/recalls.md). Listed as a series or trim of this model. - [2017 CHEVROLET SILVERADO 3500](/makes/chevrolet/silverado/2017/recalls.md). Listed as a series or trim of this model. - [2018 CHEVROLET SILVERADO 3500](/makes/chevrolet/silverado/2018/recalls.md). Listed as a series or trim of this model. - [2019 CHEVROLET SILVERADO 3500](/makes/chevrolet/silverado/2019/recalls.md). Listed as a series or trim of this model. - [2017 GMC SIERRA 2500](/makes/gmc/sierra/2017/recalls.md). Listed as a series or trim of this model. - [2018 GMC SIERRA 2500](/makes/gmc/sierra/2018/recalls.md). Listed as a series or trim of this model. - [2019 GMC SIERRA 2500](/makes/gmc/sierra/2019/recalls.md). Listed as a series or trim of this model. - [2017 GMC SIERRA 3500](/makes/gmc/sierra/2017/recalls.md). Listed as a series or trim of this model. - [2018 GMC SIERRA 3500](/makes/gmc/sierra/2018/recalls.md). Listed as a series or trim of this model. - [2019 GMC SIERRA 3500](/makes/gmc/sierra/2019/recalls.md). Listed as a series or trim of this model. ## Bulletins for the same vehicles and component A bulletin is the manufacturer's note to its dealers. It is not part of this recall. - [23\-NA\-064](/bulletins/10254014.md), 2024-05-02, Service bulletin - [21\-NA\-155](/bulletins/10253528.md), 2024-04-23, Service bulletin - [20\-NA\-132](/bulletins/10253527.md), 2024-04-23, Service bulletin - [17\-NA\-052](/bulletins/10253526.md), 2024-04-23, Service bulletin - [PIT5448J](/bulletins/10253060.md), 2024-04-15, Service bulletin - [20\-NA\-132](/bulletins/10252774.md), 2024-04-05, Service bulletin - [23\-NA\-103](/bulletins/10252126.md), 2024-03-29, Service bulletin - [17\-NA\-302](/bulletins/10252106.md), 2024-03-28, Service bulletin - [11\-00\-89\-005X](/bulletins/10251889.md), 2024-03-19, Service bulletin - [07\-00\-89\-037S](/bulletins/10251888.md), 2024-03-19, Service bulletin ## Check a VIN - [NHTSA recall lookup by VIN, United States](https://www.nhtsa.gov/recalls) - [Transport Canada recall search, Canada](https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng) JSON: [/v1/recalls/nhtsa/21V496000](/v1/recalls/nhtsa/21V496000) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20NHTSA%20recall%2021V496000&page=https%3A%2F%2Fopen.wenmarpro.com%2Frecalls%2Fnhtsa%2F21V496000&vehicle=NHTSA%20recall%2021V496000)