Technical Service Bulletin 21-PBF — 2021 PETERBILT 579
EXTERIOR LIGHTING
Bulletin Details
| TSB ID | 21-PBF |
| Manufacturer | |
| Vehicle | 2021 PETERBILT 579 |
| Component | EXTERIOR LIGHTING |
| Communication Date |
Bulletin Summary
Safety Recall â Interim Notification - The Daytime Running Lamps (DRLs) may turn off while the vehicle is in motion and the headlamps, fog lamps or turn signals are not on. This is non-compliant with Canadian Regulation CMVSS 108, which states that the DRLs must be on while the vehicle is in motion without certain other lamps being activated. This bulletin will be updated when a repair is available.
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.