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Electrical systems and batteries · UNITED STATES

21V496000: Electrical systems and batteries recall for GMC SIERRA 3500 and 3 other models

GMC SIERRA 3500 and 3 other models: check the listed vehicles, the reported issue and the manufacturer remedy for 21V496000. Keep the official status and service answers in one private record.

Official record checked 2026-10-19 UTC · Filing date 2021-07-01

Start with the specific vehicle

The report lists 12 model-year entries. Read the equipment and production restrictions in the reported issue, then use the official lookup or manufacturer to establish whether this campaign applies to your vehicle.

View the listed model years
  • 2019 GMC SIERRA 3500
  • 2019 CHEVROLET SILVERADO 2500
  • 2019 CHEVROLET SILVERADO 3500
  • 2019 GMC SIERRA 2500
  • 2017 GMC SIERRA 2500
  • 2017 GMC SIERRA 3500
  • 2017 CHEVROLET SILVERADO 2500
  • 2017 CHEVROLET SILVERADO 3500
  • 2018 CHEVROLET SILVERADO 2500
  • 2018 CHEVROLET SILVERADO 3500
  • 2018 GMC SIERRA 2500
  • 2018 GMC SIERRA 3500

Check your VIN on NHTSA →

Enter the VIN only on the official service or manufacturer site. This worksheet does not ask for it.

What the official report says

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.

Official NHTSA campaign record

Why the reported issue matters

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

Official NHTSA campaign record

Prepare your observation

Keep existing warnings or observations for service. This guide does not ask you to probe wiring, disconnect a battery or open a high-voltage assembly.

A reported defect describes the campaign. It does not establish what caused a symptom on your individual vehicle, and absence of a symptom does not establish that an open recall is complete.

The reported manufacturer 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.

Official NHTSA campaign record

Confirm current remedy arrangements

The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions.

This describes the dated source record. Current arrangements for your VIN remain unconfirmed.

Additional official 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.

View the source

Choose the next step from the official result

Not checked or unavailable

Keep eligibility unconfirmed. Use the official lookup or contact the manufacturer with 21V496000.

This campaign is open

Confirm current interim instructions, remedy availability and service arrangements. Keep the dated answer.

Not listed as open

Review earlier repair records and lookup limits if needed. A zero-open result does not explain an unresolved symptom.

Work order records recall work

Keep the campaign number, remedy and date together. Ask separately about a symptom that remains after the visit.

Your campaign-specific service questions

Use these questions with the official report. Keep the answers beside the remedy record; “discussed” records a conversation, not a completed repair.

  1. Does the manufacturer confirm that campaign 21V496000 applies to this VIN, including the report’s equipment and production restrictions?

    A matching model and year is only a starting point. The official lookup or manufacturer must establish the individual vehicle’s status.

  2. What remedy, required parts or software, and appointment arrangements are currently available for this VIN, and which interim instructions apply?

    The source does not explicitly establish current remedy availability. Ask the manufacturer about the applicable remedy, required parts or software, appointment arrangements and any interim instructions.

  3. Which electrical component or software function is covered, and what interim charging, parking or use instructions does the manufacturer give?

    Compare the answer with the reported component: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER.

  4. Which items in the reported replacement remedy for 21V496000 were replaced, and are they identified on the work order?

    Keep the replaced items and the campaign number together so that a later visit can distinguish recall work from other repairs.

  5. How does this campaign relate to 19V328000, and does work recorded under an earlier campaign satisfy the current remedy?

    Show any earlier work order. Related recall numbers can describe expanded or repeated work; ask the manufacturer to reconcile the records.

  6. What dated document records the remedy performed under 21V496000, and what should I do if the reported concern remains?

    Keep campaign completion and unresolved symptoms as separate questions. A saved worksheet or booked appointment does not establish a repair.

Download the full guide and blank worksheet

Source and lookup coverage

NHTSA 21V496000: official campaign data · Official lookup and coverage limits

The quoted issue, consequence and remedy come from the official record as checked above. This independent guide adds a vehicle-check decision process, service questions and a private worksheet. Confirm current eligibility, remedy availability and interim instructions with the manufacturer.

The official VIN lookup may omit completed recalls, some recent campaigns and recalls outside its coverage. Vehicle notes and answers stay in this browser. A downloaded brief contains your notes; keep it appropriately. Groundwork is independent of NHTSA and the manufacturer.