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Service bulletin SC-21-142

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 id11013380
Published by NHTSA2025-02-03
Manufacturer's numberSC-21-142
Manufacturer's date2021-11-22
Campaign id or software versionSC-21-142
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Transit bus software update to the body controller, when flashing the EEPROMs were auto setting to 238 not 0 when a new EEPROM was loaded on the vehicle. Then fixing a bug where the door entrance lights were not 100% brightness when doors were in use.

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

Vehicles listed
PROTERRA CATALYST2019 to 2020
PROTERRA ZX52021

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