NHTSA service bulletin

NHTSA Service Bulletin 10249692: 2018-2024 Isuzu F-series

Official manufacturer communication context for 2018-2024 Isuzu F-series, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10249692 summary graphic for 2018-2024 Isuzu F-series
10249692NHTSA document ID
Manufacturer communicationcommunication type
2affected product rows
2source 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

INFORMATION BULLETIN: Allison recently announced a new transmission fluid: TES 668. While Allison asserts this fluid is interchangeable with TES 295 for its transmissions, it is NOT interchangeable for all Isuzu vehicles. It is important to note that 2018 to 2023 Isuzu F-Series vehicles must USE ONLY the original TES 295 fluid. See Table 1 below for the correct application of TES 295 and TES 668 transmission fluids. Refer to the applicable Workshop Manual for additional information.

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
IsuzuF-series2018-2024Ask for service records and run the exact VIN before purchase.
IsuzuN-series2022-2024Ask 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 10249692?

INFORMATION BULLETIN: Allison recently announced a new transmission fluid: TES 668. While Allison asserts this fluid is interchangeable with TES 295 for its transmissions, it is NOT interchangeable for all Isuzu vehicles. It is important to note that 2018 to 2023 Isuzu F-Series vehicles must USE ONLY the original TES 295 fluid. See Table 1 below for the correct application of TES 295 and TES 668 transmission.

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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