2021 BMW Models Head Unit Resets Fault Code B7F8F9
A technical service bulletin addresses head unit resets in various 2021 BMW models, indicated by fault code B7F8F9 RESET WATCHDOG. Symptoms include interrupted radio, unavailable navigation, and a black control display. This issue affects the infotainment system.
S'applique également à
- BMW 228i
- 2021
- BMW 330e
- 2021
- BMW 430i
- 2021
- BMW 530e
- 2021
- BMW 530i
- 2021
- BMW 540i
- 2021
- BMW 740i
- 2021
- BMW 840i
- 2021
- BMW M235i
- 2021
- BMW M340i
- 2021
- BMW M440i
- 2021
- BMW M5
- 2021
- BMW M550i
- 2021
- BMW M760i
- 2021
- BMW M8
- 2021
- BMW M850i
- 2021
- BMW X3
- 2021
- BMW X4
- 2021
- BMW X5
- 2021
- BMW X6
- 2021
- BMW X7
- 2021
- BMW Z4
- 2021
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Symptoms
Owners of affected 2021 BMW models may notice several issues related to the vehicle's infotainment system. These symptoms indicate a problem with the head unit's operation.
Key symptoms include:
- The active radio or music source is interrupted unexpectedly.
- The navigation system becomes unavailable, ceasing to provide directions or map display.
- A black screen is shown in the Control Display, rendering the infotainment system inoperable.
Fault Codes / DTCs
The primary diagnostic trouble code (DTC) associated with this issue is:
- B7F8F9: This fault code is described as a "RESET WATCHDOG" event, indicating an unexpected reset of the head unit's internal system.
Diagnosis / Trigger Conditions
The
Autres révisions de ce TSB
What BMW 330i owners report
Counted from the records in our database across 16 model years.
- 818
- Owner complaints
- 39
- Recalls
- 863
- Service bulletins
- 30
- Crashes reported
- 38
- Fires reported
- 36
- Injuries reported
The 2021 model year
29 complaints, the 10th most of 16 model years on file. Owners reported 1 crash, 3 fires and 1 injury for this year, which also has 7 recalls on file.
Equipment, the system this article covers, accounts for 8 of 818 complaints (1%).
Complaints by model year
| 2001 | 116 | |
|---|---|---|
| 2002 | 45 | |
| 2003 | 77 | |
| 2004 | 113 | |
| 2006 | 219 | |
| 2017 | 42 | |
| 2018 | 32 | |
| 2019 | 41 | |
| 2020 | 53 | |
| 2021 | 29 |
Most-reported systems
- Air Bags — 246
- Exterior Lighting — 153
- Electrical System — 132
- Engine — 89
- Power Train — 44
Latest recalls for the 2021 model year
- 26V056000 — Electrical System (Jan 2026)
- 25V636000 — Electrical System (Sep 2025) — Park outside
- 23V584000 — Electrical System (Aug 2023)
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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