Technical Service Bulletin 01-090 — 2025 PETERBILT 520
ENGINE
Bulletin Details
| TSB ID | 01-090 |
| Manufacturer | |
| Vehicle | 2025 PETERBILT 520 |
| Component | ENGINE |
| Communication Date |
Bulletin Summary
Repair procedures and warranty information for model 520EV are now available. The cab heater coolant system on Peterbilt 579EV and 520EV models may not deaerate properly, causing pump malfunctions and inadequate cab heating. Update coolant deaeration return line parts and procedures are now available to release trapped air back to the reservoir.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.
Other TSBs for the 2025 PETERBILT 520
R2405 - PB
ELECTRICAL SYSTEM