"An optional software update will be available on 07/06/2026 for chassis equipped with EMY...
Kenworth technical service bulletin 43-088 for 2020-2025 Kenworth T680, 2020-2025 Peterbilt 579 and 2020-2025 Peterbilt 389 and others.
- Bulletin number
- 43-088
- Component
- Engine
- Summary
- "An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service theirtrucks before a DEF-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."
Owners of these vehicles have filed 4 complaints in the engine category.
Vehicles covered
- Kenworth T680 2020-2025 202020212022202320242025
- Peterbilt 579 2020-2025 202020212022202320242025
- Peterbilt 389 2020-2025 202020212022202320242025
- Kenworth T880 2020-2025 202020212022202320242025
- Peterbilt 567 2020-2025 202020212022202320242025
- Peterbilt 520 2020-2025 202020212022202320242025
- Peterbilt 365 2020-2025 202020212022202320242025
- Kenworth W990 2020-2025 202020212022202320242025
- Peterbilt 367 2020-2025 202020212022202320242025
- Kenworth L770 2024-2025 20242025
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