Maserati bulletin MAS003634
What it saysRapid Update 639 - for the Engine Control Module software to enhace the detection strategy of the exhaust valve's angular position and prevents the improper triggering of DTCs P1217/P121B. NHTSA’s full summary ↓
Maserati filed this with NHTSA as a service bulletin dated Jun 13, 2023, received Jul 31, 2023, about the engine. It names 1 model year (2022). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationRapid Update 639 - for the Engine Control Module software to enhace the detection strategy of the exhaust valve's angular position and prevents the improper triggering of DTCs P1217/P121B.
Trouble codes it names: P1217 P121B
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| MAS003634 | Service bulletin | Jun 13, 2023 | 10239772 | not found |
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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themA 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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More bulletins about the engine
Source: same model, same component group13 other manufacturer communications filed against the Maserati MC20 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… |
| 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. |
| MAS004864 MTB 25-33 | Other | Sep 16, 2025 | This bulletin introduces the serviceability of the oil pump bearing on the V6 Nettuno engine. The bearing can now be replaced individually… |
| MAS004789 DS 25-19 | Other | Jul 11, 2025 | This diagnostic sheet is intended to assist technicians in identifying and differentiating engine oil leaks and sweating. |
| MAS004438_A MTB 25-16 | Other | Jun 1, 2025 | his Technical bulletin serves as a diagnostic guide for managing oil leaks and instructing related repairs. This Bulletin requires a BOL to… |
| MAS004460 MTB 25-09 | Other | Mar 5, 2025 | This Technical bulletin serves as a guide and provides additional diagnostic info regarding MC20 engine noise characteristics during tip-in… |
| MAS004438 MTB 25-03 | Other | Jan 28, 2025 | This Technical information bulletin serves as a diagnostic guide for managing engine oil leaks and instructing related repairs. |
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 MAS003634 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 MAS003634 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 MAS003634 cover?
The manufacturer filed it against 1 model year: 2022 Maserati MC20. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.