Volvo bulletin C10346
What it saysCourtesy Upgrade C10346 Vehicle Computational Unit (VCU2) Quality Bulletin for Model Year 2025 EX90 vehicles. NHTSA’s full summary ↓
Volvo filed this with NHTSA as a manufacturer communication dated Feb 27, 2026, received Mar 2, 2026, about the electrical system — 2 documents under this number: C10346.3.0 (2 filings). It names 1 model year (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 communicationCourtesy Upgrade C10346 Vehicle Computational Unit (VCU2) Quality Bulletin for Model Year 2025 EX90 vehicles. This is for the upgrade of the VCU to the VCU version 2 and new software.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| C10346.3.0 | Other | Feb 27, 2026 | 11029184 | |
| C10346.3.0 | Other | Feb 22, 2026 | 11029183 |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 32425147 | — | — | |
| 36013403 | VCU Exch | — | eBay Motors → |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches Volvo’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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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What owners reported
Source: NHTSA complaint databaseOwners of the 1 model year this bulletin names have filed 74 complaints with NHTSA since 2015. 38 of them name Electrical System — 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.
I am writing to file a formal safety complaint regarding my Volvo EX90, which experienced a complete and dangerous shutdown while driving on a LA freeway on Christmas Day.
2025 Volvo EX90 · Electrical System · filed with NHTSA Jan 16, 2026 · ODI 11711504
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 electrical system
Source: same model, same component group19 other manufacturer communications filed against the Volvo EX90 under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Volvo list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| S10393 | Service campaign | Sep 24, 2026 | Volvo Cars has decided that all cars, concerned by this QB, shall be upgraded in accordance with this QB, at first workshop visit. To get th… |
| 37478.1.2 | Service bulletin | May 7, 2026 | This is a TJ - Text plus 1 PDF - If a customer experiences an Electric System Limited message along with reduced performance, and there are… |
| D10367 | Service campaign | Apr 3, 2026 | Quality Bulletin for delivery action of the 2025 EX90 GHCA, D10367. |
| D10366.1.0 | Service campaign | Apr 3, 2026 | Quality Bulletin for a delivery action for the MY2026 EX90 GHCA |
| TJ37279.4.0-2025-11-06 | Service bulletin | Nov 14, 2025 | This is a Technical Journal: In most cases the VCU does not need to be replaced. *The script in VIDA for VCU reload is now working |
| 37275 | Service bulletin | Aug 1, 2025 | This is a Technical Journal: EX90 GHCA Replacement: Prior Approval Needed. please create a "Prior Approval" vehicle report with "GHCA Prior… |
| 37453 | Service bulletin | Jul 31, 2025 | This is a Technical Journal: EX90 - Software download issue to HUD. Do not perform a HUD Reload. |
| 37445 | Service bulletin | Jul 18, 2025 | This is a Technical Journal: Various Issues Due to BMS. Verify that the correct battery monitoring sensor (BMS) is fitted to both 12V batter… |
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 C10346 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 C10346 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 C10346 cover?
The manufacturer filed it against 1 model year: 2025 Volvo EX90. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.