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Service bulletin SC-21-162

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 id11014256
Published by NHTSA2025-02-14
Manufacturer's numberSC-21-162
Manufacturer's date2021-12-21
Campaign id or software versionSC-21-162
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

Pin location change on an ECU to properly assign both doors open signal and the horn relay signal.

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.