# Service bulletin 2038952/1

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: 10170098
- Published by NHTSA: 2020\-07\-28
- Manufacturer's number: 2038952/1
- Manufacturer's date: 2015\-01\-01
- NHTSA component: ENGINE AND ENGINE COOLING; POWER TRAIN; ELECTRICAL SYSTEM

## NHTSA's summary

Mulsanne engine and transmission control module software update \(SC15/01\) Technical background: Customer may experience powertrain clunk feeling when driving at low load. Investigations found that improvements in the modelled auxiliary torque drag would remove the clunk sensation, Remedy The improved modelled auxiliary torque drag calibration for Mulsanne must be applied by performing this campaign process.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10170098-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10170098-9999.pdf)

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

## Components

Electrical system, Engine, Transmission and driveline

## Vehicles listed

- 2011 to 2015 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\(s\)
- [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.
- [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
- [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
- [2051562/15](/bulletins/11029791.md), 2026-03-06, Service bulletin: ELECTRICAL SYSTEM. 12 volt \- Battery condition checks \- Battery replacement requirements. Customer statement / workshop findings: 12 volt battery flat or unserviceable
- [2051562/14](/bulletins/11029222.md), 2026-03-03, Service bulletin: ELECTRICAL SYSTEM. 12 volt \- Battery condition checks \- Battery replacement requirements. Condition: 12 volt battery flat or unserviceable
- [2061195/4](/bulletins/11025211.md), 2025-11-08, Service bulletin: ELECTRICAL SYSTEM. Telephone Functionality Complaint \- Minimum Standards Required For Analysis Of Concerns.

JSON: [/v1/bulletins/10170098](/v1/bulletins/10170098)

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