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Service bulletin SC-21-088

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 id11013493
Published by NHTSA2025-02-03
Manufacturer's numberSC-21-088
Manufacturer's date2021-07-23
Campaign id or software versionSC-21-088
NHTSA componentELECTRICAL SYSTEM; VISIBILITY/WIPER

NHTSA's summary

Transit bus software update to the body controller, to update the controls to have the overhead lighting turn off after the doors close to reduce glare.

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 CATALYST2019
PROTERRA ZX52020

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