Maserati bulletin MAS004864 MTB 25-33
What it saysThis bulletin introduces the serviceability of the oil pump bearing on the V6 Nettuno engine. NHTSA’s full summary ↓
Maserati filed this with NHTSA as a manufacturer communication dated Sep 16, 2025, received Oct 2, 2025, about the engine. It names 27 model years (2016–2026). 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 introduces the serviceability of the oil pump bearing on the V6 Nettuno engine. The bearing can now be replaced individually, eliminating the need for complete engine or long block replacement when noise is traced to this component. Models Involved: • Grecale V6 (All MY) • GranTurismo V6 / GranCabrio V6 (All MY) • MC20 / MC20 Cielo / MC20 Pura (All MY)
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| MAS004864 MTB 25-33 | Other | Sep 16, 2025 | 11023566 | PDF, 307 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: 2020 Maserati Granturismo; 2021 Maserati Granturismo; 2022 Maserati Granturismo; 2023 Maserati Granturismo; 2022 Maserati Grecale; 2021 Maserati MC20; 2026 Maserati MC20; 2026 Maserati MC20 Pura; 2024 Maserati Nuova Grancabrio; 2025 Maserati Nuova Grancabrio; 2024 Maserati Nuova Granturismo; 2025 Maserati Nuova Granturismo.
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 15 model years this bulletin names have filed 13 complaints with NHTSA since 2015. 2 of them name Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The contact owns a 2023 Maserati Grecale. The contact stated while driving at approximately 45 MPH, the vehicle started losing motive power. The coolant warning light was illuminated. The vehicle was veered to the side of the road and restarted.
2023 Maserati Grecale · Engine · filed with NHTSA Aug 9, 2023
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.
More bulletins about the engine
Source: same model, same component group29 other manufacturer communications filed against these Maserati models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Maserati list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| MAS005186 MCL 26-16 | Other | Jul 20, 2026 | We are informing you that tool p/n 900100024 has been updated with an additional component designed to improve the oil seal installation pro… |
| RAPID UPDATE 831 | Service campaign | Jul 14, 2026 | Grecale GranTurismo and GranCabrio – Radiator Water Inlet Pipe Inspection. Some vehicles may have protective caps installed on the engine co… |
| MAS005111_A MTB 26-06 | Other | May 6, 2026 | Maserati Coolant Fluid Color Change. The previous pink coolant and the new purple coolant are fully compatible and may be mixed without affe… |
| MAS005111 MTB 26-05 | Other | Apr 21, 2026 | Maserati Coolant fluid Color Change from pink to purple. |
| MAS004952 DS 25-36 | Other | Nov 25, 2025 | This Diagnostic Sheet serves as a guide and provides additional diagnostic info for possible issues potentially affecting the oil pump/sens… |
| MAS004939 MTB 25-43 | Other | Nov 19, 2025 | This bulletin provides instructions for checking engine radiator leaks. The purpose of this procedure is to confirm leaks with clear evidenc… |
| MAS004829 MTB 25-37 | Other | Oct 15, 2025 | This bulletin explains how to identify and handle momentary coolant leaks from the water pump’s weeper chamber on Maserati MHEV engines. It… |
| MAS004831 MTB 25-32 | Other | Sep 3, 2025 | A new software update is now available for the AGSM (Automatic Gear Shift Module) on Grecale, GranTurismo, and GranCabrio vehicles. This up… |
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 MAS004864 MTB 25-33 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 MAS004864 MTB 25-33 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 MAS004864 MTB 25-33 cover?
The manufacturer filed it against 27 model years: 2024 Maserati GranTurismo, 2019 Maserati GranTurismo, 2018 Maserati GranTurismo, 2017 Maserati GranTurismo, 2016 Maserati GranTurismo, 2025 Maserati Grancabrio and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.