NHTSA service bulletin

NHTSA Service Bulletin 10026805: 1998-2006 Buick Avalanche

Official manufacturer communication context for 1998-2006 Buick Avalanche, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10026805 summary graphic for 1998-2006 Buick Avalanche
10026805NHTSA document ID
Service campaigncommunication type
29affected 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

BUICK\CHEVROLET\GMC SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SPECIAL COVERAGE ADJUSTMENT-ANALOG ONSTAR DEACTIVATION. CSC LETTER WAS RECEIVED. *PE

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
BuickCentury1999-2005Ask for service records and run the exact VIN before purchase.
BuickLacrosse2005, 2006Ask for service records and run the exact VIN before purchase.
BuickLesabre2000-2005Ask for service records and run the exact VIN before purchase.
BuickLucerne2006Ask for service records and run the exact VIN before purchase.
BuickPark Avenue1999-2005Ask for service records and run the exact VIN before purchase.
BuickRainier2004, 2005Ask for service records and run the exact VIN before purchase.
BuickRegal1999-2004Ask for service records and run the exact VIN before purchase.
BuickRendezvous2002-2004Ask for service records and run the exact VIN before purchase.
ChevroletAvalanche2002-2004Ask for service records and run the exact VIN before purchase.
ChevroletBlazer1999-2001Ask for service records and run the exact VIN before purchase.
ChevroletCavalier2003-2005Ask for service records and run the exact VIN before purchase.
ChevroletCobalt2005, 2006Ask for service records and run the exact VIN before purchase.
ChevroletColorado2004Ask for service records and run the exact VIN before purchase.
ChevroletCorvette2005, 2006Ask for service records and run the exact VIN before purchase.
ChevroletEquinox2005Ask for service records and run the exact VIN before purchase.
ChevroletExpress2003, 2004Ask for service records and run the exact VIN before purchase.
ChevroletImpala2000-2006Ask for service records and run the exact VIN before purchase.
ChevroletLumina1999, 2000Ask 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 10026805?

BUICK\CHEVROLET\GMC SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SPECIAL COVERAGE ADJUSTMENT-ANALOG ONSTAR DEACTIVATION. CSC LETTER WAS RECEIVED. *PE

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.

Get Full Report