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Service bulletin SC-21-075

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11013545
Published by NHTSA2025-02-04
Manufacturer's numberSC-21-075
Manufacturer's date2021-05-20
Campaign id or software versionSC-21-075
NHTSA componentELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM

NHTSA's summary

Transit bus repair to HV roof pantograph charging cables. The HV lugs that are bolted to the pantograph rail must be fully sealed to prevent water ingress.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Fuel system

Vehicles listed
PROTERRA CATALYST2019
PROTERRA ZX52020

Listing a model year does not mean every vehicle of it is concerned: the document says which.