Certain chassis with CARB 2024 compliant MX-13 engines must have the PEU wiring harnesses updated
Kenworth technical service bulletin E328 for 2025-2026 Kenworth T680, 2025-2026 Peterbilt 579 and 2025-2026 Kenworth T880 and others.
- Bulletin number
- E328
- Component
- Electrical system
- Summary
- Certain chassis with CARB 2024 compliant MX-13 engines must have the PEU wiring harnesses updated. The original wiring and fuse are insufficient for electrical system operation and protection.
Vehicles covered
- Kenworth T680 2025-2026 20252026
- Peterbilt 579 2025-2026 20252026
- Kenworth T880 2025-2026 20252026
- Peterbilt 567 2025-2026 20252026
- Peterbilt 589 2025-2026 20252026
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