Maserati bulletin MAS004812 MTB 25-27
What it saysThis bulletin provides technical guidance regarding a metallic noise originating from the exhaust system on Grecale MHEV models during cold starts. NHTSA’s full summary ↓
Maserati filed this with NHTSA as a manufacturer communication dated Jul 15, 2025, received Jul 18, 2025. It names 4 model years (2022–2025). A manufacturer communication 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis bulletin provides technical guidance regarding a metallic noise originating from the exhaust system on Grecale MHEV models during cold starts. The issue is related to exhaust valve behavior and will be resolved through a future software update. MILD HYBRID ONLY
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| MAS004812 MTB 25-27 | Other | Jul 15, 2025 | 11020795 | PDF, 216 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. 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. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2022 Maserati Grecale.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 13 complaints with NHTSA since 2015.
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Maserati, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Maserati MAS004812 MTB 25-27 a recall?
No. A manufacturer communication 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 MAS004812 MTB 25-27 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 MAS004812 MTB 25-27 cover?
The manufacturer filed it against 4 model years: 2025 Maserati Grecale, 2024 Maserati Grecale, 2023 Maserati Grecale, 2022 Maserati Grecale. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.