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Service bulletin SC-21-112

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 id11013423
Published by NHTSA2025-02-03
Manufacturer's numberSC-21-112
Manufacturer's date2021-10-27
Campaign id or software versionSC-21-112
NHTSA componentELECTRICAL SYSTEM; VISIBILITY/WIPER

NHTSA's summary

Transit bus repair to the vehicles wiper switch, the switch is replaced in this bulletin to improve reliability as the switch was stuck on.

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, Glass, wipers and mirrors, Wipers and washers

Vehicles listed
PROTERRA ZX52020 to 2021

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