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Service bulletin 2028794/10

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11035307
Published by NHTSA2026-07-29
Manufacturer's number2028794/10
Manufacturer's date2026-07-16
NHTSA componentENGINE

NHTSA's summary

Engine coolant mixture - Restrictions on use of desalinated water.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
BENTLEY BENTAYGA2017, 2018, 2019, 2020, 2021, 2022, 2023
BENTLEY BENTAYGA2025, 2026, 2027
BENTLEY BENTAYGA HYBRID2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027 (the catalog's model; the bulletin names a series or trim of it)
BENTLEY CONTINENTAL GT2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027 (the catalog's model; the bulletin names a series or trim of it)
BENTLEY CONTINENTAL GT CABRIO2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027 (the catalog's model; the bulletin names a series or trim of it)
BENTLEY FLYING SPUR2006 to 2013
BENTLEY FLYING SPUR2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027
BENTLEY FLYING SPUR HYBRID2022, 2023, 2024 (the catalog's model; the bulletin names a series or trim of it)
BENTLEY MULSANNE2009 to 2010
BENTLEY MULSANNE2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
BENTLEY SUPERSPORTS2027
BENTLEY redundant BENTAYGA2024

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
2083110/12026-10-07. Service bulletin. Engine Management Light - N91 Coolant Valve | Flying Spur Hybrid Technical background: Some 22MY Flying Spur Hybrid vehicles may exhibit an illuminated Malfunction Indicator Lamp (MIL) due to DTC P26B100 - Engine Coolant Bypass Valve "A" Stuck Closed being stored in the Thermal Management Control Module (00C5). When this DTC is present, the Thermal Management system displays MIL light on the DIP, resulting in DTC P162400 being stored in the Engine Control Module. A software update is available to address this condition.
2083066/12026-09-09. Service bulletin. Drive system fault - Camshaft position sensor DTC. Customer may state following concerns: Drive system fault on the dashboard Abnormal engine noise on engine start-up
2061369/142026-09-09. Service bulletin. Engine Overheating - Warning in the DIP | V8 Kovomo. Customer statement / workshop findings: One or a combination of the following symptoms are evident • Engine overheat warning in the DIP (Engine overheating) • Unusual cooling fan operation at high temperatures • P19F700: Low engine coolant temperature indicator lamp coolant too warm • Signs of coolant in the vacuum hoses for switch valve N649
2082212/22026-09-05. Service campaign. Subframe Mount Control Unit - Calibration Update | Bentayga Series | 26-27MY (SC26/16) Technical background: On the affected vehicles the current dataset in the J931 power unit mounting control unit causes unintended active operation of the engine mount. The updated calibration replaces the existing dataset with a revised version, deactivating the active mount function.
2061369/132026-09-05. Service bulletin. Engine Overheating - Warning in the DIP | V8 Kovomo. Customer statement / workshop findings: One or a combination of the following symptoms are evident: • Engine overheat warning in the DIP (Engine overheating) • Unusual cooling fan operation at high temperatures • P19F700: Low engine coolant temperature indicator lamp coolant too warm • Signs of coolant in the vacuum hoses for switch valve N649
2081085/22026-08-06. Service bulletin. V8 Engine - Ticking Noise, Misfiring and Possible Low Oil Pressure Indications. Customer statement: The customer may report an audible ticking noise from the top of the engine, low oil pressure warnings / MIL on the Driver Information Panel, and/or misfiring during engine operation
2051187/132026-08-05. Service bulletin. Poor Engine Running Complaints (Misfires) Petrol Engines Only. Customer statement / workshop findings: • Poor engine running • Reduced power • Engine warning lamp illuminated • Symptom related DTC’s evident within the applicable engine control unit(s)
2068273/62026-08-03. Service bulletin. Multiple random misfires evident during PDI.
2065664/62026-08-01. Service bulletin. Bentayga V8 Kovomo - Engine MIL light on - DTC “O2 Sensor Signals Swapped Bank 1 Sensor 2/ Bank 2 Sensor 2. Customer statement / workshop findings: DTC P004100: “O2 Sensor Signals Swapped Bank 1 Sensor 2/ Bank 2 Sensor 2 is evident within address 0001 (Engine control unit) and MIL light active after attempting to conduct a readiness test
2081236/22026-08-01. Service bulletin. Loss of Cabin Heat During Engine Operation | Bentayga - V8. Customer Statement: Customers may report that the air conditioning system blows only cold air when the engine is running. Warm air is only available after switching off the engine. The concern is commonly reported after engine removal or recent repair work.