NHTSA service bulletin

NHTSA Service Bulletin 10171448: 2020 Toyota Avalon

Official manufacturer communication context for 2020 Toyota Avalon, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10171448 summary graphic for 2020 Toyota Avalon
10171448NHTSA document ID
Manufacturer communicationcommunication type
9affected product rows
9source rows grouped

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

TSB: REVISION NOTICE January 15, 2020 Rev2: ? The entire bulletin has been updated. February 11, 2019 Rev1: ? The Introduction and Every Two Months sections have been updated. Any previous printed versions of this bulletin should be discarded. Hybrid vehicles are equipped with two types of batteries: ? Hybrid Vehicle (HV) battery ? Auxiliary (12V) battery If the hybrid vehicle is put into storage, the State-Of-Charge (SOC) of its HV battery and auxiliary battery will gradually decrease. To prevent the auxiliary battery from becoming discharged during storage, proper maintenance is necessary. Perform the following maintenance service for the HV battery and auxiliary battery. NOTE ? BEFORE disconnecting the auxiliary battery, confirm the shift lever is in the ?P? position and apply the parking brake completely. The shift lever CANNOT be shifted from the ?P? position with the auxiliary battery disconnected. ? If the negative (?) terminal of the auxiliary battery is reconnected, even if the vehicle is powered ON (Ready ON), the hybrid system may NOT start. In this case, depress the brake pedal and press the Power button to start the hybrid system (the Ready light is ON). If the hybrid system still does NOT start (the Ready light is OFF), refer to the Repair Manual.

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
ToyotaAvalon2020Ask for service records and run the exact VIN before purchase.
ToyotaCamry2020Ask for service records and run the exact VIN before purchase.
ToyotaCorolla2020Ask for service records and run the exact VIN before purchase.
ToyotaHighlander2020Ask for service records and run the exact VIN before purchase.
ToyotaMirai2020Ask for service records and run the exact VIN before purchase.
ToyotaPrius2020Ask for service records and run the exact VIN before purchase.
ToyotaPrius C2020Ask for service records and run the exact VIN before purchase.
ToyotaPrius Prime2020Ask for service records and run the exact VIN before purchase.
ToyotaRav42020Ask 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 10171448?

TSB: REVISION NOTICE January 15, 2020 Rev2: ? The entire bulletin has been updated. February 11, 2019 Rev1: ? The Introduction and Every Two Months sections have been updated. Any previous printed versions of this bulletin should be discarded. Hybrid vehicles are equipped with two types of batteries: ? Hybrid Vehicle (HV) battery ? Auxiliary (12V) battery If the hybrid vehicle is put into storage, the.

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