BMW bulletin B310326
What it saysVarious external influences can cause premature aging of the tension strut hydro-mount elastomer; which can lead to cracks in the material, and leakage. NHTSA’s full summary ↓
BMW filed this with NHTSA as a service bulletin dated Feb 23, 2026, received Feb 26, 2026, about the suspension. It names 3 model years (2024). 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 communicationVarious external influences can cause premature aging of the tension strut hydro-mount elastomer; which can lead to cracks in the material, and leakage.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B310326 | Service bulletin | Feb 23, 2026 | 11029047 | PDF, 277 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 31 10 8 864 693 | Tension strut with rubber mounting, left | 1 | eBay Motors → |
| 31 10 8 864 694 | Tension strut with rubber mounting, right | 1 | eBay Motors → |
| 07 14 6 885 389 | Star-socket screw (M14x1.5x119 ) | 2 | eBay Motors → |
| 07 14 6 885 653 | Locking nut | 2 | eBay Motors → |
| 07 14 6 875 114 | Hexagon nut with collar | 2 | eBay Motors → |
| 07 11 9 908 596 | Screw (M12x1.5x48) | 8 | eBay Motors → |
| 31 20 6 795 249 | Collar screw with spring | 2 | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 00 58 999 | Lump-sum fee for photo documentation (Reference: SI B31 03 26 Tension Struts Hydro… | 1 FRU |
Read by machine from the document NHTSA serves (4 pages), read Sep 30, 2026. A part number is shown only where it matches BMW’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 3 model years this bulletin names have filed 216 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 suspension
Source: same model, same component group5 other manufacturer communications filed against these BMW models under the same component group (suspension), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B310122 | Service bulletin | Jan 3, 2026 | During inspection and/or diagnosis there is noticeable dirt/grease buildup on the axles near the inner and/or outer CV boots. |
| B064625 | Other | Sep 5, 2025 | Control Arm Return |
| 0037360200 | Service campaign | Jun 12, 2025 | The air line on the air suspension supply system may not be properly installed. In the event of a fault, residual pressure is maintained in… |
| B320725 | Service bulletin | Jun 11, 2025 | Rattling/knocking noise from the front axle at low speeds of less than 15 mph. The noises are induced by driving over rough road surface or… |
| 0061140900 | Service campaign | Apr 18, 2025 | Due to unfavorable tolerances, the Power Control Unit (PCU) may switch off under heavy loads and nolonger charge the Lithium-Ion (Li-Ion) Au… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for BMW, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is BMW B310326 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 B310326 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. Every BMW warranty extension on file lists the ones BMW has filed.
Which vehicles does B310326 cover?
The manufacturer filed it against 3 model years: 2024 BMW X5, 2024 BMW X6, 2024 BMW X7. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.