# Service bulletin 2057991/1

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.

- Type: Service bulletin
- NHTSA id: 10169838
- Published by NHTSA: 2020\-01\-09
- Manufacturer's number: 2057991/1
- Manufacturer's date: 2019\-12\-13
- NHTSA component: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM

## NHTSA's summary

Customer statement / workshop findings: Malfunction Indicator Lamp \(MIL\) illuminated on driver instrument panel. Engine runs unevenly when starting from cold. Camshaft position Diagnostic Trouble Codes \(DTCs\) stored within Engine Control Unit \(ECU\). Technical background: When the engine is cold increased friction within the camshaft adjuster unit may result in camshaft position DTCs being stored within the ECU. The concern can be resolved by replacing the camshaft timing gear with a B level part which utilises an internal return spring with higher rate. See Parts information below. There are many possible DTCs related to this failure, the following is a typical example P001200 : A Camshaft position \(Bank 1\) timing over\-retarded.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10169838-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10169838-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine

## Trouble codes named

P0012

## Vehicles listed

- 2016 to 2020 BENTLEY MULSANNE

## Other bulletins for the same vehicles and component

- [2051187/13](/bulletins/11035901.md), 2026-08-05, Service bulletin: ELECTRICAL SYSTEM; ENGINE. 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\(s\)
- [2055036/9](/bulletins/11035572.md), 2026-08-04, Service bulletin: ELECTRICAL SYSTEM. My Bentley \- Connected services. Customer statement / workshop findings: Complaints relating to My Bentley connected services.
- [2028808/10](/bulletins/11035379.md), 2026-07-31, Service bulletin: ELECTRICAL SYSTEM; ENGINE. Service info: Engine oil – Specific oil type and oil consumption reference.
- [2028794/10](/bulletins/11035307.md), 2026-07-29, Service bulletin: ENGINE. Engine coolant mixture \- Restrictions on use of desalinated water.
- [2080097/2](/bulletins/11035288.md), 2026-07-29, Service bulletin: ENGINE; FUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM; EXTERIOR LIGHTING; STRUCTURE:BODY. Service info: Conversion of imported vehicles. Technical background: Conversion of a vehicle for use in a market other than the one for which it was originally designed or intended is not supported. Enquiries related to conversions or retrofits of vehicles from \(or to\) other markets \(e.g. reimport from USA or UK\) are not supported by Technical Support. Vehicles are developed and constructed according to specific market requirements of the respective destination country. As the compatibility of different components \(e.g. control units\) cannot be defined comprehensively regarding their mutual dependence and interaction in the case of modifications, and in order to prevent danger or risks due to constructional changes, support or advice regarding these modifications cannot be provided.
- [2075786/3](/bulletins/11035283.md), 2026-07-29, Service bulletin: STRUCTURE:BODY; SEAT BELTS; AIR BAGS; ELECTRICAL SYSTEM. Airbag, fire, accident \(safety\-related enquiry \- reporting forms\) There is a reporting obligation in the following cases: • Airbag/belt released/not released • General accident • Fire and scorching damage for all Bentley Vehicle models \- every model year.
- [2051562/17](/bulletins/11035242.md), 2026-07-28, Service bulletin: ELECTRICAL SYSTEM. 12 volt \- Battery condition checks \- Battery replacement requirements
- [2071131/6](/bulletins/11034759.md), 2026-07-07, Service bulletin: ELECTRICAL SYSTEM. Measured values \- Cycle recording instructions Condition: In some cases Measured value traces may be requested in XML format for analysis by Product Support Technical Background: The instructions within the Measure section of this TPI have been generated to guide operatives through the process for recording Measured values in cycles by using self diagnosis, the Instructions also detail how to locate corresponding files which are required for analysis
- [2081882/1](/bulletins/11033674.md), 2026-06-06, Service bulletin: ELECTRICAL SYSTEM. Navigation Map Update Process \- MIB2 Infotainment Systems. Customer statement / workshop findings: The customer requests improved and/or newer navigation functionality, including access to the latest navigation maps and updated map content.
- [2051562/16](/bulletins/11032226.md), 2026-05-05, Service bulletin: ELECTRICAL SYSTEM. 12 volt \- Battery condition checks \- Battery replacement requirements. Customer statement / workshop findings: 12 volt battery flat or unserviceable

JSON: [/v1/bulletins/10169838](/v1/bulletins/10169838)

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