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Service bulletin 24-003-21

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 id10198437
Published by NHTSA2021-06-28
Manufacturer's number24-003-21
Manufacturer's date2021-05-12
NHTSA componentVISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; ELECTRICAL SYSTEM; VISIBILITY

NHTSA's summary

Flash: Heating, Ventilation and Air Conditioning (HVAC) Module Updates This bulletin involves reprogramming the HVAC control module with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination with the following Diagnostic Trouble Code (DTC) or the symptom/conditions listed below: B10C8-36 - Cabin Fan Brushless - Signal Frequency Too Low. The HVAC fan stops working after a Engine Start/Stop (ESS) function.

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, Heating and air conditioning

Trouble codes named

B10C8

Vehicles listed
ALFA ROMEO GIULIA2020

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