OFFICIAL CAMPAIGN FILE

NHTSA campaign 21V496000

NHTSA campaign 21V496000 covers 12 published year-and-model reports from 2 makes in this index and lists 338,020 potentially affected units campaign-wide. VIN eligibility must be checked separately.

Report received July 1, 2021 · Snapshot September 21, 2026

01 / DEFECT RECORD

What NHTSA campaign 21V496000 says

NHTSA campaign 21V496000 identifies EQUIPMENT and states that An electrical short-circuit can increase the risk of a fire.

Defect summary

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.

Consequence summary

An electrical short-circuit can increase the risk of a fire.

02 / CORRECTIVE ACTION

Remedy for NHTSA campaign 21V496000

For NHTSA campaign 21V496000, the filed corrective action says: 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.

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.

Owner notification: April 4, 2022
Filing manufacturer: General Motors, LLC
Component groups: EQUIPMENT

03 / PUBLISHED VEHICLES

Vehicles listed under NHTSA campaign 21V496000

RecallRoad links 12 year-and-model reports associated with NHTSA campaign 21V496000; the list reflects published source rows, not individual VIN coverage.