2021 BMW Taillight Condensation TSB
A Technical Service Bulletin (TSB) addresses condensation found on the inner surfaces of one or both taillights in various 2021 BMW models, including the 2021 BMW 330i. This manufacturer communication helps dealers diagnose and resolve the issue.
Also applies to
- BMW 330e
- 2021
- BMW 430i
- 2021
- BMW 840i
- 2021
- BMW M3
- 2021
- BMW M340i
- 2021
- BMW M4
- 2021
- BMW M440i
- 2021
- BMW M8
- 2021
- BMW M850i
- 2021
- BMW X5
- 2021
- BMW X6
- 2021
- BMW X7
- 2021
- BMW Z4
- 2021
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Symptoms
Owners of certain 2021 BMW models may observe condensation present on the inner surfaces of one or both taillights. This condition, officially labeled as "Condensation in Taillight" by BMW, can affect the appearance and potentially the function of the exterior lighting system.
Diagnosis
This manufacturer communication, identified by NHTSA ID 10188951, specifically addresses the presence of moisture within the taillight assembly. The TSB serves as guidance for technicians to properly identify and address the condensation issue. If you notice 2021 BMW 330i taillight condensation, it's important to have it inspected.
Repair Procedure Summary
The Technical Service Bulletin (TSB) provides instructions for authorized BMW service centers on how to handle instances of taillight condensation. While specific repair steps are detailed for technicians, the general approach involves assessing the extent of the condensation and performing the necessary service to rectify the condition. This may include inspection for seals, proper ventilation, or component replacement as outlined in the TSB.
Owner Action
If you own a 2021 BMW model and are experiencing 2021 BMW 330i taillight condensation or similar moisture inside your taillights, it is recommended to schedule an appointment with an authorized BMW dealer. They will be able to diagnose the issue according to the guidelines provided in manufacturer communication NHTSA ID 10188951 and perform any necessary repairs under warranty, if applicable.
Source: NHTSA ID 10188951
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.
Exterior Lighting, the system this article covers, accounts for 153 of 818 complaints (19%).
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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