Technical Service Bulletin T020 - PB — 2026 PETERBILT 548
POWER TRAIN
Bulletin Details
| TSB ID | T020 - PB |
| Manufacturer | |
| Vehicle | 2026 PETERBILT 548 |
| Component | POWER TRAIN |
| Communication Date |
Bulletin 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.
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 2026 PETERBILT 548
25PBE
SERVICE BRAKES