Volvo bulletin 37666.1.0
What it saysThis is a TJ - text plus 1 pdf - If the Check Engine Light is on and DTC ECM P044100 is set, please follow the advice under "Service". NHTSA’s full summary ↓
Volvo filed this with NHTSA as a service bulletin dated Mar 19, 2026, received Apr 7, 2026, about the fuel/propulsion system. It names 2 model years (2025–2026). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis is a TJ - text plus 1 pdf - If the Check Engine Light is on and DTC ECM P044100 is set, please follow the advice under "Service". Do not start by replacing parts. Improved software is introduced with version 5.0.5.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 37666.1.0 | Service bulletin | Mar 19, 2026 | 11031104 |
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 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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A weekly email, sent only in a week when Volvo files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 2 model years this bulletin names have filed 12 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.
More bulletins about the fuel/propulsion system
Source: same model, same component group4 other manufacturer communications filed against the Volvo XC40 under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 37236.5.1 | Service bulletin | Mar 7, 2026 | This is a Technical Journal: Text only no attachments - CEL and DTC ECM P04F000. New ECM software has been released |
| 37236 | Service bulletin | Dec 19, 2025 | This is a Technical Journal: CEL and DTC ECM P04F000. New ECM software has been released |
| TJ37521-1 | Service bulletin | Nov 1, 2025 | This is a Technical Journal - If a customer experiences a "Propulsion System Service Required" message in the DIM, and the DTC IEM P0CBC62 i… |
| TJ37521.1.0-2025-10-14 | Service bulletin | Nov 1, 2025 | This is a Technical Journal - If a customer experiences a "Propulsion System Service Required" message in the DIM, and the DTC IEM P0CBC62 i… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Volvo, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Volvo 37666.1.0 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 37666.1.0 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 37666.1.0 cover?
The manufacturer filed it against 2 model years: 2026 Volvo XC40, 2025 Volvo XC40. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.