Technical Service Bulletin
Topic
Market area
Brand
Transaction No.
Level
Status
Release date

W12 Engine management light on - Turbocharger speed sensor DTC's stored
Bentley: worldwide (2WBE)
Bentley
2053348/10
EH
Released for publishing
Dec 1, 2022

Diagnostic trouble codes
Diagnostic address
0001 - Engine electronics
0011 - Engine Electronics 2
0001 - Engine electronics
0011 - Engine Electronics 2
0001 - Engine electronics
0011 - Engine Electronics 2
0001 - Engine electronics
0011 - Engine Electronics 2

Diagnostic trouble code
Fault symptom
P257900: Turbocharger Speed Sensor "A" Circuit Range/Performance
P257900: Turbocharger Speed Sensor "A" Circuit Range/Performance
P259400: Turbocharger Speed Sensor "B" Circuit Range/Performance
P259400: Turbocharger Speed Sensor "B" Circuit Range/Performance
P259500: Turbocharger Speed Sensor "B" Circuit Low
P259500: Turbocharger Speed Sensor "B" Circuit Low
P259600: Turbocharger Speed Sensor "B" Circuit High
P259600: Turbocharger Speed Sensor "B" Circuit High

Storage state
static
static
static
static
static
static
static
static

New customer code
Object of complaint
information, navigation, communication, entertainment -> malfunction display symbols -> emissions control
system malfunction display
engine -> engine operation

Vehicle data
W12 - New GT/C - New Flying Spur & Bentayga
Sales types
Type
3S31BB
3S31BB
3S31BB
3S31BB
3S31BB
3S31BB
3S31EB
3S31EB
3S31EB
3S41BB
3S41BB
3S41BB
3S41BB
3S41BB
3S41EB
3S41EB
3S41EB
4V14A9
4V14A9
4V14A9
4V14A9
4V14A9
4V14A9
4V14A9
4V14G9
4V14G9

MY
2018
2019
2020
2021
2022
2023
2021
2022
2023
2019
2020
2021
2022
2023
2021
2022
2023
2017
2018
2019
2020
2021
2022
2023
2020
2021

Brand Designation Engine code Gearbox code
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*

Final drive code
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*

Complaint type
functionality ->
activates
functionality

Position

4V14G9
4V14G9
4V14G9
ZG21BB
ZG21BB
ZG21BB
ZG21BB
ZG26BB

2021
2022
2023
2020
2021
2022
2023
2023

E
E
E
E
E
E
E
E

Documents
Document name
master.xml

*
*
*
*
*
*
*
*

*
*
*
*
*
*
*
*

*
*
*
*
*
*
*
*

Technical Service Bulletin
W12 Engine management light on - Turbocharger speed sensor DTC's stored

Transaction No.: 2053348/10
Release date: Dec 1, 2022

Condition
Customer statement:
•

Engine management light is evident within the DIP

Workshop findings:
•

Engine management light is evident within the DIP

DTC P259400 - Turbocharger Speed Sensor “B” - Circuit Range/Performance are stored within address 01 - Engine Control Module 1 or
address 11 - Engine Control Module 2 could be evident with the following symptom codes
•

23179 (only)

Or
•

23179 with 32790

Or
•

32790 (only)

Or
One or a combination of the following DTC’s may also be evident (with no specific symptom codes)
•

P259500: Turbocharger Speed Sensor “B” - Circuit low

•

P259600: Turbocharger Speed Sensor "B" - Circuit High

•

P257900: Turbocharger Speed Sensor “A” - Circuit Range/Performance

Technical Background
Refer to the instructions within the Measure section of this TPI ensuring the correct method of repair is followed depending on the DTC and
symptom code

Revision history
2053348/6
•

Additional DTC’s/symptom codes added within the Measure section

2053348/7
•

Warranty accounting instructions are now included

•

Measure section amended to include detail regarding the requirement to raise a Technical DISS query (depending on symptom)

Production Solution
Not applicable

Service
The operative should discuss the following with the customer to clarify the driving conditions in which the issue occurs, see
examples below:
•

Duration the vehicle was driven before the issue was evident

•

Throttle load (harsh or light acceleration)

•

What gradient they were driving on (uphill/downhill/flat road surface etc)

•

Speed of the vehicle when the issue occurred

•

Road conditions for example: City driving with traffic queues

Comments

IMPORTANT: The operative should include the customer feedback to a new or existing Technical DISS query

P259400: Turbocharger Speed Sensor “B” - Circuit Range/Performance with the following symptom codes
•

23179 (only)

Or
•

23179 and 32790

Or
•

32790 (only)

NOTE: Step 1 only applies to New Continental GT/GTC and New Flying Spur
1) Referring to Rep.Gr 24 - Remove the air filter top cover New Continental GT/GTC and New Flying Spur Only
•

Inspect for damage or missing components NOTE: The example in Figure 1 shows an air filter box divider that has become detached,
causing DTC - P259400: Turbocharger Speed Sensor “B” - Circuit Range/Performance

•

Reattach the divider and retest the vehicle if this particular fault is found

Figure 1
•

Should no issues be found within the air filter box please continue with the remaining instructions from step 2

2) All Models
Road test the vehicle to attempt to reproduce the complaint TIP: Carry out an extensive road test if required
IMPORTANT: Drive the vehicle under the same driving conditions as when the customer experienced the complaint, u sing
light and hard acceleration cycles
3) Referring to Rep.Gr 24 - Air/vacuum system - Leak diagnostic process using smoke machine - Check the intake and exhaust systems for air
leaks
NOTE: If a leak is detected the operative should feedback the findings via a new or existing Technical DISS query, once a
response is received the operative should rectify the leak as required
4) Carry out all applicable test plans for the affected Turbocharger speed sensor, if wiring checks are suggested the operative must also carry
out the following manual wiring checks for the affected sensor:
•

Open circuit

•

Short circuit to ground

•

Short circuit to B+

•

Short circuit of the wires to each other

If the wiring tests are to specification refer to the information as below depending on the DTC which is evident:

P259400: Turbocharger Speed Sensor "B" Circuit Range/Performance with symptom code 23179 (only)
Question: Is this the first complaint received regarding P259400 with symptom code 23719?
NO - Raise a new or respond via the existing Technical DISS query
HINT: To assist with further diagnosis the operative must include all required information, including •

Current ODIS log

•

Include all relevant information relating to the failure mode

•

Photographs or videos of any issues found

YES - Clear the applicable DTC and retest to confirm if the issue has been rectified (Parts replacement not required). If issue repeats, raise a
new or respond via existing Technical DISS query
IMPORTANT: Drive the vehicle under the same driving conditions as when the customer experienced the complaint, u sing
light and hard acceleration cycles
NOTE: Should any of the following DTC’s and symptom codes be evident Referring to Rep.Gr 21 - Replace the applicable
Turbocharger speed sensor
HINT: Please ensure that the instructions within the applicable Rep.Gr are strictly followed including the replacement of any
single use items
NOTE: Please also ensure that for Betayga models the alignment of applicable driver assist systems is conducted including
four wheel alignment (Depending on vehicle specification)
•

P259400: Turbocharger Speed Sensor "B" Circuit Range/Performance with symptom code 23179 and 32790

•

P259400: Turbocharger Speed Sensor "B" Circuit Range/Performance with symptom code 32790 (only)

•

P259500: Turbocharger Speed Sensor "B" Circuit Low

•

P259600: Turbocharger Speed Sensor "B" Circuit High

•

P257900: Turbocharger Speed Sensor "A" Circuit Range/Performance

IMPORTANT: In the event the issue is still evident after replacing the applicable Turbocharger speed sensor, the operative
should raise a new or respond via the existing Technical DISS query and await feedback before conducting any further work
When replacing the Turbocharger speed sensor take extreme care not to damage the component, DO NOT discard of the
sensor as it may be requested back for analysis
IMPORTANT: Please ensure the new or existing Technical DISS query detailing the method of repair is submitted

Warranty
Warranty type
110 or 910
Damage service number
21 59
Damage code
00 40
Bentayga
Time to replace Bank 1 Turbocharger speed sensor (G688)
Labour operation code
21 59 19 02
Time
960 TU’s
Time to replace Bank 2 Turbocharger speed sensor (G689)
Labour operation code
21 59 19 01
Time
540 TU’s
Alignment of applicable driver assist systems (Depending on vehicle specification)
•

Vehicle front + rear measured wheel alignment checked - 44 95 03 00 - 110 TU

•

Rear wheel camber adjust - 44 94 15 50 - 30 TU

•

Rear wheel track adjust - 44 93 15 50 - 30 TU

•

Front wheel camber adjust - 44 89 15 50 - 40 TU

•

Front wheel track adjust - 44 88 15 50 - 20 TU

•

(ACC) - Radar sensor checked + adjusted - 91 63 05 51 - 30 TU

•

Overhead view camera adjusted - 90 83 15 00 - 40 TU

•

Driver assist camera adjusted - 96 38 15 50 - 120 TU

•

Control unit for (Lane change assist) adjusted - 96 35 15 00 - 50 TU

•

Night vision system calibration - 90 80 15 50 - 40 TU

•

Headlamps to adjust - 94 15 16 00 20 TU

New Continental GT/GTC and New Flying Spur
Time to conduct air filter box check
Labour operation code
24 24 01 00 (Use 99 index until 29/09/22)
Time
10 TU’s
Time to replace Bank 1 Turbocharger speed sensor (G688)
Labour operation code
21 59 19 02
Time
160 TU’s
Time to replace Bank 2 Turbocharger speed sensor (G689)
Labour operation code
21 59 19 01
Time
160 TU’s
All Models
Road test
Labour operation code
01 21 00 00
Time
50 TU’s
Wiring integrity checks
Labour operation code
97 09 01 00
Time
Must not exceed 50 TU’s

Required Parts and Tools
Refer to the ETKA parts catalogue