NHTSA service bulletin

NHTSA Service Bulletin 11006645: 2019-2025 Cadillac 6500

Official manufacturer communication context for 2019-2025 Cadillac 6500, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 11006645 summary graphic for 2019-2025 Cadillac 6500
11006645NHTSA document ID
Manufacturer communicationcommunication type
17affected product rows
75/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

This informational bulletin provides a way for the technician to identify if the ECM has been modified.

What this bulletin may mean before buying

Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.

Affected products listed in this communication

MakeModelModel yearsBuyer note
CadillacEscalade2021-2024Ask for service records and run the exact VIN before purchase.
CadillacEscalade Esv2021-2023Ask for service records and run the exact VIN before purchase.
Chevrolet65002019Ask for service records and run the exact VIN before purchase.
ChevroletDuplicate Silverado 55002019Ask for service records and run the exact VIN before purchase.
ChevroletSilverado 25002020-2024Ask for service records and run the exact VIN before purchase.
ChevroletSilverado 35002020-2024Ask for service records and run the exact VIN before purchase.
ChevroletSilverado 45002019-2024Ask for service records and run the exact VIN before purchase.
ChevroletSilverado 55002019, 2020, 2021, 2023, 2024Ask for service records and run the exact VIN before purchase.
ChevroletSilverado 65002019, 2021, 2022, 2023, 2025Ask for service records and run the exact VIN before purchase.
ChevroletSuburban2021, 2022, 2024Ask for service records and run the exact VIN before purchase.
GMCSierra 25002020-2024Ask for service records and run the exact VIN before purchase.
GMCSierra 35002020-2024Ask for service records and run the exact VIN before purchase.
GMCYukon2021-2024Ask for service records and run the exact VIN before purchase.
GMCYukon Xl2021-2023Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 11006645?

This informational bulletin provides a way for the technician to identify if the ECM has been modified.

Is a service bulletin the same as a recall?

No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.

How should a used-car buyer use this bulletin?

Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.

Check the exact VIN before you buy

Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.

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