This optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY...
Kenworth technical service bulletin 43-086 for 2019-2021 Kenworth T680, 2019-2021 Peterbilt 579 and 2019-2021 Kenworth T800 and others.
- Bulletin number
- 43-086
- Component
- Engine
- Summary
- This optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY 2019-2021A PACCAR MX-11 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 3 complaints in the engine category.
Vehicles covered
- Kenworth T680 2019-2021 201920202021
- Peterbilt 579 2019-2021 201920202021
- Kenworth T800 2019-2021 201920202021
- Kenworth W900 2019-2021 201920202021
- Peterbilt 389 2019-2021 201920202021
- Kenworth T880 2019-2021 201920202021
- Peterbilt 567 2019-2021 201920202021
- Peterbilt 520 2019-2021 201920202021
- Kenworth T800B 2021 2021
- Kenworth W900B 2021 2021
- Kenworth W990 2019-2021 201920202021
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