Fiat bulletin 21-040-25
Fiat filed this with NHTSA as a service bulletin dated Oct 2, 2025, received Oct 8, 2025, about the power train. It names 7 model years (2017–2023). 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 communication948TE Transmission Reaction Shaft Service Bushing Kit Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): â—� P1DB7-00 - Torque Converter Clutch Performance.
Document filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| 21-040-25 | Service bulletin | Oct 2, 2025 | 11024056 |
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 themA 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 Fiat 21-040-25 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 21-040-25 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 21-040-25 cover?
The manufacturer filed it against 7 model years: 2023 Fiat 500, 2022 Fiat 500, 2021 Fiat 500, 2020 Fiat 500, 2019 Fiat 500, 2018 Fiat 500 X and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.