Technical Service Bulletin 34-074 — 2019 PETERBILT 520
ELECTRICAL SYSTEM
Bulletin Details
| TSB ID | 34-074 |
| Manufacturer | |
| Vehicle | 2019 PETERBILT 520 |
| Component | ELECTRICAL SYSTEM |
| Communication Date |
Bulletin Summary
Non Safety Campaign: Vehicles were built with a 5 bolt supply wire for the air dryer pressure sensor that is no longer required with current architecture. If left in place, a fault code P1644 may be set.
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.