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 |
| 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.
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.
| 2017 CHEVROLET SILVERADO 2500 | Listed as a series or trim of this model. |
|---|---|
| 2018 CHEVROLET SILVERADO 2500 | Listed as a series or trim of this model. |
| 2019 CHEVROLET SILVERADO 2500 | Listed as a series or trim of this model. |
| 2017 CHEVROLET SILVERADO 3500 | Listed as a series or trim of this model. |
| 2018 CHEVROLET SILVERADO 3500 | Listed as a series or trim of this model. |
| 2019 CHEVROLET SILVERADO 3500 | Listed as a series or trim of this model. |
| 2017 GMC SIERRA 2500 | Listed as a series or trim of this model. |
| 2018 GMC SIERRA 2500 | Listed as a series or trim of this model. |
| 2019 GMC SIERRA 2500 | Listed as a series or trim of this model. |
| 2017 GMC SIERRA 3500 | Listed as a series or trim of this model. |
| 2018 GMC SIERRA 3500 | Listed as a series or trim of this model. |
| 2019 GMC SIERRA 3500 | Listed as a series or trim of this model. |
A vehicle with no link is not in this site's catalog, which covers cars, multipurpose vehicles and trucks by model year. The campaign is from data as of 2026-10-19.
Bulletins for the same vehicles and component
| 23-NA-064 | 2024-05-02. Service bulletin. This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Battery stand time of the vehicle during transit and or long period of stand time at the dealerships. |
|---|---|
| 21-NA-155 | 2024-04-23. Service bulletin. This informational bulletin advises the technician to check for faults that may be caused by the trailer otherwise found by a possible faulty trailer connector. |
| 20-NA-132 | 2024-04-23. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements. |
| 17-NA-052 | 2024-04-23. Service bulletin. This bulletin updates the position of General Motors on refinishing aluminum wheels. GM has determined that wheel refinishing under warranty will no longer be performed. |
| PIT5448J | 2024-04-15. Service bulletin. This Preliminary Information communication advises the technician with a tip when the vehicle stops running after it has been idling for 2.5 hours. This is normal operation of the vehicle built with regular production code BTM and without Regular Production Option Code AVF. If the vehicle was built with regular production code BTM and AVF only has a 1 hour idle time. |
| 20-NA-132 | 2024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements. |
| 23-NA-103 | 2024-03-29. Service bulletin. This service bulletin provides information on submitting quality Photos of Various Vehicle Concerns to the GM Technical Assistance Center (TAC). |
| 17-NA-302 | 2024-03-28. Service bulletin. This informational bulletin provides information on availability for a locking gas cap for trucks are operated in high amount of dirt or dust which can migrate to the filler cap area. |
| 11-00-89-005X | 2024-03-19. Service bulletin. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only). |
| 07-00-89-037S | 2024-03-19. Service bulletin. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs. |
A bulletin is the manufacturer's note to its dealers. It is not part of this recall.