Bentley bulletin 2070237.1
What it saysEngine Control Module Update - Mulsanne (SC 23/12) Technical Background: -Software update is now available and should be applied to the engine control unit NHTSA’s full summary ↓
Bentley filed this with NHTSA as a service bulletin dated May 23, 2023, received Jun 7, 2023, about the engine. It names 4 model years (2017–2020). 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 Control Module Update - Mulsanne (SC 23/12) Technical Background: -Software update is now available and should be applied to the engine control unit
Trouble codes it names: U0146 all 1 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 2070237.1 | Service bulletin | May 23, 2023 | 10236998 | PDF, 421 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 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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More bulletins about the engine
Source: same model, same component group11 other manufacturer communications filed against the Bentley Mulsanne 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 |
|---|---|---|---|
| 2028794/10 | Service bulletin | Jul 16, 2026 | Engine coolant mixture - Restrictions on use of desalinated water. |
| 2028808/10 | Service bulletin | Jul 15, 2026 | Service info: Engine oil – Specific oil type and oil consumption reference. |
| 2051187/12 | Service bulletin | Oct 25, 2025 | Poor Engine Running Complaints (Misfires) Petrol Engines Only. Condition: • Poor engine running • Reduced power • Engine warning lamp illumi… |
| 2028808/9 | Service bulletin | Oct 25, 2025 | Service info: Engine oil - Specific oil type and oil consumption reference. Technical Background: The use of the correct oil for each engine… |
| 2064337/4 | Service bulletin | Oct 24, 2025 | Usage of E10 fuel. Condition In the event a customer asks if E10 fuel can be used, the operative must refer to the Technical background sect… |
| 2028794/9 | Service bulletin | Oct 24, 2025 | Engine coolant mixture - Restrictions on use of desalinated water. Technical Background: An important factor of influencing the cooling syst… |
| 2028794/8 | Service bulletin | Mar 4, 2025 | Engine coolant mixture - Restrictions on use of desalinated water. Technical Background: An important factor of influencing the cooling syst… |
| 2028808/8 | Service bulletin | Mar 3, 2025 | Service info: Engine oil - Specific oil type and oil consumption reference. Condition: Engine oil level requires top up between services Tec… |
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 2070237.1 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 2070237.1 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 2070237.1 cover?
The manufacturer filed it against 4 model years: 2020 Bentley Mulsanne, 2019 Bentley Mulsanne, 2018 Bentley Mulsanne, 2017 Bentley Mulsanne. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.