Fix-As-Fail Certain Model 535, 536, 537, and 548 chassis equipped with a PACCAR TX-8 transmission received...
Peterbilt technical service bulletin T020 - PB for 2024-2026 Peterbilt 548, 2024-2026 Peterbilt 537 and 2024-2025 Peterbilt 535 and others.
- Bulletin number
- T020 - PB (T020 - PB)
- Component
- Power train
- Summary
- Fix-As-Fail Certain Model 535, 536, 537, and 548 chassis equipped with a PACCAR TX-8 transmission received transmission software with an incorrect variable. This software issue may cause DTC 521215-2 to set, the Transmission Dash Light to Illuminate, and shifting to be restricted. A software update is now available to fix the issue. Fix-as-Fail start date: 03/19/2025.
Vehicles covered
- Peterbilt 548 2024-2026 202420252026
- Peterbilt 537 2024-2026 202420252026
- Peterbilt 535 2024-2025 20242025
- Peterbilt 536 2024-2026 202420252026
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