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Service bulletin 2400621

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 id10223490
Published by NHTSA2022-10-17
Manufacturer's number2400621
Manufacturer's date2021-05-12
NHTSA componentELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM

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, Software

Trouble codes named

B10C8

Vehicles listed
ALFA ROMEO STELVIO2021

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

Other bulletins for the same vehicles and component
08243232024-01-16. Service bulletin. USB Software Update to 131.010.002 for RAN Radio The customer may describe the following: ? Wrong temperature information is displayed on the performance page. This bulletin involves inspecting the software level to see if the radio needs one or two USB flash drive(s) to update the radio software level to 131.010.002. CAUTION! The repair procedure must be followed step by step. If the radio is not updated with the correct software level at the correct time the radio can be damaged or the updates won?t complete.