2021 BMW 330i Sunroof Reverses When Closing TSB
A manufacturer communication (TSB) addresses an issue where the sunroof in certain 2021 BMW 330i, M340i, and 330e models reverses direction just as the glass meets the wind deflector. This can prevent proper sunroof initialization.
Also applies to
- BMW 330e
- 2021
- BMW M340i
- 2021
Owners of certain 2021 BMW 330i, M340i, and 330e vehicles may encounter an issue where the sunroof reverses direction when closing. This behavior, described as the sunroof "anti-trapping" just as the glass makes contact with the wind deflector, can lead to the sunroof not initializing correctly.
Symptoms
The primary symptom is the sunroof reversing direction just before it fully closes. Specifically, the sunroof glass meets the wind deflector, and instead of completing the closing cycle, it reverses. This can result in the sunroof failing to properly initialize, which may affect its normal operation.
Diagnosis / Trigger Conditions
This issue, where the 2021 BMW 330i sunroof reverses when closing, is specifically triggered by the interaction between the sunroof glass and the wind deflector during the closing sequence. The system's anti-trap function is activated, causing the reversal. Technicians would likely observe this behavior to confirm the condition.
Repair Procedure Summary
While the specific repair steps are not detailed in this manufacturer communication, issues like the "sunroof reverses when closing" often point to a need for software updates or recalibration of the sunroof system. A BMW service technician would diagnose the exact cause and perform the necessary adjustments or programming to resolve the anti-trap activation and ensure proper sunroof initialization.
Owner Action
If you own a 2021 BMW 330i, M340i, or 330e and experience your sunroof reversing when closing, it is recommended to contact your authorized BMW dealership. Explain the symptom, specifically mentioning that the sunroof reverses when the glass meets the wind deflector. The dealership can perform diagnostics and apply any necessary software updates or repairs under this manufacturer communication (TSB).
Source: NHTSA ID: 10188947
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.
Visibility, the system this article covers, accounts for 20 of 818 complaints (2%).
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)
Recent owner reports about visibility
Read owner complaints →While I was driving down the highway, sunroof has exploded without any apparent reason. I really didn’t realize what had happened at first, all I heard was a loud bang which could’ve lead to distraction and cause an accident.
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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