Bentley bulletin 2028794/9
What it saysEngine coolant mixture - Restrictions on use of desalinated water. NHTSA’s full summary ↓
Bentley filed this with NHTSA as a service bulletin dated Oct 24, 2025, received Nov 6, 2025, about the engine. It names 42 model years (2016–2026). 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 communicationEngine coolant mixture - Restrictions on use of desalinated water. Technical Background: An important factor of influencing the cooling system efficiency is the water used in the mixture Due to the different ingredients and characteristics existing in each country or even region, Bentley has decided to define the quality of water for cooling systems
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 2028794/9 | Service bulletin | Oct 24, 2025 | 11025077 | PDF, 77 KB |
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 themAlso filed against model years this site has no page for: 2019 Bentley Continental GT; 2016 Bentley Continental GT Cabrio; 2017 Bentley Continental GT Cabrio; 2018 Bentley Continental GT Cabrio; 2019 Bentley Continental GT Cabrio; 2020 Bentley Continental GT Cabrio; 2019 Bentley Flying Spur; 2024 Bentley Redundant Bentayga.
A 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 34 model years this bulletin names have filed 20 complaints with NHTSA since 2015. 4 of them name Engine — 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.
The auto start on this Bentley bentagya most of the time does not work properly, but as I AM now over 12,000 miles it has started to cause the car to call at odd times. For example coming out of a parking space the car stalled leaving me half in and half out the space. It also stalled at a traffic light 3 days ago.
2017 Bentley Bentayga · Engine · filed with NHTSA Sep 2, 2017 · ODI 11021157
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 engine
Source: same model, same component group107 other manufacturer communications filed against these Bentley models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Bentley list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 2083066/1 | Service bulletin | Aug 29, 2026 | Drive system fault - Camshaft position sensor DTC. Customer may state following concerns: Drive system fault on the dashboard Abnormal engin… |
| ED95 | Service campaign | Aug 11, 2026 | Subframe Mount Control Unit - Calibration Update | Bentayga Series | 26-27MY (SC26/16) Technical background: On the affected vehicles the cu… |
| 2081085/2 | Service bulletin | Jul 17, 2026 | V8 Engine - Ticking Noise, Misfiring and Possible Low Oil Pressure Indications. Customer statement: The customer may report an audible ticki… |
| 2078190/7 | Service bulletin | Jul 17, 2026 | AC System not Cooling - HVAC Leakage Customer Statement: The customer may find that the A/C system not blowing cold air and / or Cooling per… |
| 2071190/4 | Service bulletin | Jul 17, 2026 | HVAC failing to cool | DTC B16A1F0 in diagnostic address 00C5 | Bentayga Series (Hybrid). |
| 2058484/16 | Service bulletin | Jul 16, 2026 | Bentayga V8 Kovomo - DTC P310B00 with Symptom Code 2638 - Check Engine Lamp - Fuel Pressure Regulation. Customer statement / workshop findin… |
| 2055664/4 | Service bulletin | Jul 16, 2026 | DTC P14AB00 and/or other related exhaust flap DTC's - Warning lamp evident within the DIP. |
| 2028794/10 | Service bulletin | Jul 16, 2026 | Engine coolant mixture - Restrictions on use of desalinated water. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Bentley, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Bentley 2028794/9 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 2028794/9 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 2028794/9 cover?
The manufacturer filed it against 42 model years: 2026 Bentley Bentayga, 2025 Bentley Bentayga, 2024 Bentley Bentayga, 2023 Bentley Bentayga, 2022 Bentley Bentayga, 2021 Bentley Bentayga and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.