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Service bulletins for the 2020 Peterbilt 579

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

105 on file from NHTSA, as of 2026-10-19.

By type

By component

By topic

Bulletins, newest first
34-0662019-07-08. Service bulletin. ELECTRICAL SYSTEM. Information Only - Quick Reference Guide for Electric harness damage repairs.
15-0272019-06-11. Service bulletin. STEERING:HYDRAULIC POWER ASSIST:POWER STEERING FLUID; EQUIPMENT ADAPTIVE/MOBILITY. Non Safety Campaign: ZF (supplier) steering gear boxes may have a sealing plug not seated corrected allowing power steering fluid loss.
19PBA2019-06-10. Service bulletin. VISIBILITY. Safety Recall: Peterbilt Motors Company has determined that a defect, which relates to motor vehicle safety, may exist in certain model year 2020 Model 567 and 579 vehicles manufactured between 2/15/2019 and 3/15/2019. The upper mirror in the side mirror assemblies could fall from the housing and limit the visibility of the driver. The mirror and carrier will be inspected to verify the Mekra Lang manufacture date and replaced if necessary.
34-0792019-06-10. Service bulletin. POWER TRAIN. Fix-As-Fail ? Intermittent throttle hesitation may be encountered after installing an optional PTO connector.
34-0772019-05-13. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT:ELECTRICAL. Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.