NHTSA service bulletin

NHTSA Service Bulletin 10197977: 2021, 2022 Thor Motor Coach Ace

Official manufacturer communication context for 2021, 2022 Thor Motor Coach Ace, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10197977 summary graphic for 2021, 2022 Thor Motor Coach Ace
10197977NHTSA document ID
Manufacturer communicationcommunication type
8affected product rows
90/100quality 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

On your vehicle, the rear axle may contain an inadequate volume of lubricating oil. An inadequate volume of rear axle lubricant may result in rear wheel bearing damage potentially leading to bearing seizure. Bearing seizure may lead to rear axle or driveshaft failure. A rear axle or driveshaft failure may result in loss of vehicle motive power, loss of transmission park function, and loss of parking brake function, increasing the risk of a crash. This affects the following Thor Motor Coach products: model year 2021/2022 Ace, Challenger, Freedom Traveler, Hurricane, Miramar, Outlaw, and Windsport motorhomes

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
Thor Motor CoachAce2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachChallenger2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachFreedom Traveler2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachHurricane2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachMiramar2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachOutlaw2021, 2022Ask for service records and run the exact VIN before purchase.
Thor Motor CoachRedundant Windsport2021Ask for service records and run the exact VIN before purchase.
Thor Motor CoachWindsport2021, 2022Ask 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 10197977?

On your vehicle, the rear axle may contain an inadequate volume of lubricating oil. An inadequate volume of rear axle lubricant may result in rear wheel bearing damage potentially leading to bearing seizure. Bearing seizure may lead to rear axle or driveshaft failure. A rear axle or driveshaft failure may result in loss of vehicle motive power, loss of transmission park function, and loss of parking brake function,.

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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