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Service bulletin SC-23-091

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 id11007827
Published by NHTSA2024-09-16
Manufacturer's numberSC-23-091
Manufacturer's date2023-09-08
Campaign id or software versionSC-23-091
NHTSA componentELECTRICAL SYSTEM; ENGINE

NHTSA's summary

This Technical Service Bulletin covers the procedure for replacing the Power Electronic Coolant Loop quick connect fittings with more durable brass fittings for 40ft ZX5.A0 buses.

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, Engine

Vehicles listed
PROTERRA ZX52022 to 2023

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