This optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024...
Kenworth technical service bulletin 43-089 for 2024-2026 Kenworth T680, 2024-2026 Peterbilt 579 and 2024-2025 Kenworth W900 and others.
- Bulletin number
- 43-089
- Component
- Engine
- Summary
- This optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024 EMY 2024-2026 PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
Owners of these vehicles have filed 1 complaints in the engine category.
Vehicles covered
- Kenworth T680 2024-2026 202420252026
- Peterbilt 579 2024-2026 202420252026
- Kenworth W900 2024-2025 20242025
- Kenworth T880 2024-2026 202420252026
- Peterbilt 567 2024-2026 202420252026
- Peterbilt 520 2024-2026 202420252026
- Kenworth W900B 2024-2025 20242025
- Kenworth L770 2024-2026 202420252026
- Kenworth W990 2024-2026 202420252026
- Peterbilt 589 2024-2026 202420252026
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