Service bulletin 2400421
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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 10230112 |
| Published by NHTSA | 2023-01-17 |
| Manufacturer's number | 2400421 |
| Manufacturer's date | 2021-05-12 |
| NHTSA component | 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
Glass, wipers and mirrors, Heating and air conditioning
Trouble codes named
B10C8
| ALFA ROMEO STELVIO | 2020 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2025533 | 2025-10-07. Visual System |
|---|
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| 9100142 | 2023-05-30. Service bulletin. Mirror |
|---|---|
| 0808222 | 2022-12-19. Service bulletin. Heating Ventilation and Air Conditioning (HVAC) Updates |
| 2400421 | 2022-10-17. Service bulletin. 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. |
| S2024000006 | 2022-09-26. Service bulletin. After Module Replacement A/C Systems Do Not Operate Properly. DTC B1938-64 Humidity Sensor LIN Bus ? Signal Plausibility Failure |
| S2124000004 | 2022-09-26. Service bulletin. A/C does not cool and vehicle is low on Freon charge but no leak is found with sniffer or black light anywhere in the system |
| 24-003-20 | 2021-03-01. Service bulletin. 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. |