Volvo bulletin 34521
Volvo filed this with NHTSA as a service bulletin dated Dec 20, 2025, received Dec 10, 2024, about the exterior lighting — 2 documents under this number. It names 80 model years (2016–2026). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis is a Technical Journal: Headlamp condensation inside lens - information/leak test. If the result is not ok (air leak), it is ok to replace the headlamp
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| 34521 | Service bulletin | Dec 20, 2025 | 11027189 |
| 34521 | Service bulletin | Nov 1, 2024 | 11011735 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. Quote it at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themand 35 more model years on this site.
Also filed against model years this site has no page for: 2025 Volvo C40BEV; 2022 Volvo Duplicate C40BEV; 2023 Volvo Duplicate C40BEV; 2024 Volvo Duplicate C40BEV; 2025 Volvo Duplicate C40BEV.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Volvo 34521 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 34521 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 34521 cover?
The manufacturer filed it against 80 model years: 2024 Volvo C40, 2023 Volvo C40, 2022 Volvo C40, 2026 Volvo EC40, 2025 Volvo EC40, 2026 Volvo EX30 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.