Technical Service Bulletin
Topic

Engine Overheating - Coolant Pump Leaking and Low Coolant Warning |
W12

Market area

Bentley: worldwide (2WBE)

Brand

Bentley

Transaction No. 2071239/5
Level

EH

Status

Released for publishing

Release date

Dec 4, 2025

New customer code

Object of complaint

Complaint type

engine -> cooling system

leaks

lighting, signaling -> acoustic signals -> coolant monitoring
audio warning

functionality -> activates

engine -> cooling system -> coolant

component, automotive fluids ->
too little

Vehicle data
W12 Engine Variants
Sales types

Type

MY

Brand Designation Engine code Gearbox code Final drive code

3S31AB 2018 E

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*

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3S31BB 2018 E

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3S31BB 2019 E

*

*

*

3S31BB 2020 E

*

*

*

3S31BB 2021 E

*

*

*

3S31BB 2022 E

*

*

*

3S31EB 2021 E

*

*

*

3S31EB 2022 E

*

*

*

3S31EB 2023 E

*

*

*

3S31EB 2024 E

*

*

*

3S41BB 2019 E

*

*

*

Position

3S41BB 2020 E

*

*

*

3S41BB 2021 E

*

*

*

3S41BB 2022 E

*

*

*

3S41EB 2021 E

*

*

*

3S41EB 2022 E

*

*

*

3S41EB 2023 E

*

*

*

3S41EB 2024 E

*

*

*

4V14A9 2017 E

*

*

*

4V14A9 2018 E

*

*

*

4V14A9 2019 E

*

*

*

4V14A9 2020 E

*

*

*

4V14A9 2021 E

*

*

*

4V14G9 2020 E

*

*

*

4V14G9 2021 E

*

*

*

4V14G9 2022 E

*

*

*

4V14G9 2023 E

*

*

*

ZG21BB 2020 E

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*

*

ZG21BB 2021 E

*

*

*

ZG21BB 2022 E

*

*

*

ZG21BB 2023 E

*

*

*

ZG21BB 2024 E

*

*

*

ZG26BB 2023 E

*

*

*

Documents
Document name
master.xml

Technical Service Bulletin
Engine Overheating - Coolant Pump Leaking and Low Coolant Warning | W12

Transaction No.: 2071239/5
Release date: Dec 4, 2025

Condition
One or a combination of the following is evident:
•

Coolant leaking from the mechanical coolant pump

•

Coolant witness marks on the mechanical coolant pump although coolant is not leaking/dripping from
the pump

•

Low coolant level warning displayed within the DIP

Or
•

Engine overheating issues and/or DTC P218100: Cooling System Performance with symptom code
8113 or air in the coolant DTC’s (various) is evident, in this scenario the operative should also refer to
TPI 2051893/-

Technical Background
CAUTION
This TPI is applicable to vehicles which have a mechanical coolant pump with the part number 07P 121
008B or 07P 121 008C
HINT: A borescope may have to be used when checking the part number of the mechanical coolant pump

Revision history
TPI 2071239/4
Measure section test sequence amendment, perform the vacuum leak test and line inspection prior to the
road test.

Production Solution
-

Service
1) On receipt of the vehicle - Take a photograph of the coolant level within the coolant reservoir and inspect
the engine bay for any coolant residue (figure 1).

Figure 1
NOTICE
If coolant residue is found in the engine bay, please raise a full technical DISS query and attach a
photograph of the coolant residue and a photograph of the coolant level.
2) Using ODIS check to confirm that no DTC’s are evident relating to low coolant or overheating issues in
particular
DTC P218100: Cooling System Performance with symptom code 8113
Or
Air in the coolant DTC’s (See Customer statement/workshop findings section if DTC P218100: Cooling
System Performance with symptom code 8113 or Air in the coolant DTC’s are evident
•

Save the current ODIS log online

•

Take a photo of any coolant related warnings which are evident within the DIP

•

Take a photo of any suspected coolant leaks

WARNING
The next part of the process requires the coolant system to be pressure tested, the operative must ensure
the instructions within Rep.Gr 19 are followed. The engine MUST BE cold before conducting the pressure

test
3) Referring to Rep.Gr 19 - Pressure test the coolant system to confirm if a coolant leak is evident from the
mechanical coolant pump
NOTICE
VERY IMPORTANT: In the event that a leak is evident on a C level mechanical coolant pump and coolant
is leaking/dripping as a result of conducting the coolant pressure test - Record a clear video of the leak
(whilst carrying out the pressure test) the video must then be uploaded to a new or existing DISS query
Refer to the video located within the Bentley Hub reference TPI 2071238/-.
The video shows an example of a coolant pump with no leak, although a small coolant witness mark is
evident (Figure 2). In this scenario the coolant witness mark should be cleaned off (using a suitable cleaning
agent) to the condition shown in Figure 3

Figure 2

Figure 3
4) Perform a block (hydrocarbon) test
CAUTION
Before performing the block test ensure the test liquid is within its expiry date and is deep blue in colour
Note: Take photos or record a video both before and after the block test.

If the test liquid changes colour the block test has failed, please raise a full technical DISS query with the
photos or videos attached.

NOTICE
If a B level coolant pump is fitted to the vehicle, proceed to step 9

If a coolant leak is evident whilst conducting the pressure test the operative must go directly to Step 8
5) Referring to Figure 4 - Disconnect each vacuum hose with care from the Solenoid for coolant circuit N492
- visually monitor for any traces of coolant

Figure 4
HINT: Refer to the video on the Bentley Hub referencing TPI 2071239/NOTICE
VERY IMPORTANT: If traces of coolant are evident during disconnection, take clear photos or record a
clear video of any coolant within the vacuum hoses or N492 and attach to a new or existing technical
DISS query

Please note the quoted video should be used for reference purposes only as it may not show the same part
which is fitted to the applicable vehicle (although the symptom is the same regardless of the type shown)
6) Use a Mityvac or similar vacuum tool to check and confirm there are no vacuum related issues/leaks
present within the system to check and confirm if N492 is sticking open and supplying a constant vacuum
7) Conduct a road test
On return, conduct a visual check to confirm if the leak is evident or not.
NOTICE
Should a leak NOT be evident, no further action is required.
NOTE: In the event there are no visible coolant leaks from the mechanical coolant pump and the coolant
level is to specification as per Rep.Gr 10 - DO NOT replace the mechanical coolant pump (No further action
is required)
8) Raise a technical DISS query or respond via an already open DISS query to request permission to
replace the mechanical coolant pump ensuring the following is attached to the DISS query:
•

Clear photo of the coolant level

•

Clear photo of the original mechanical coolant pump part number 07P 121 008C (Figure 5)

•

Video of the coolant leak whilst carrying out the pressure test

•

Current ODIS log

•

Await feedback via DISS before replacing any parts

NOTE: The photo shown in Figure 5 is a C level coolant pump (shown removed from the vehicle for
photographic purposes) a borescope may have to be used for photographs of the coolant pump when fitted

Figure 5

NOTICE
If a C level coolant pump is fitted to the vehicle, permission MUST be granted before proceeding with step
9
9) Replace the following
•

Mechanical coolant pump - Rep.Gr 19

•

Solenoid for coolant circuit N492 assembly - Rep.Gr 19

NOTICE
IMPORTANT: Ensure the vacuum hoses are free from moisture DO NOT use compressed air to attempt
to remove moisture from the vacuum hoses (allow the moisture to naturally evaporate from the vacuum
lines) as damage to other components and unintentional disconnection of vacuum hoses can occur if
compressed air is used
In the event that 07P 121 008B was originally fitted and replaced with 07P 121 008C a non-technical DISS
query is required (see NOTICE below)
NOTICE
IMPORTANT: When raising the non-technical DISS query, a clear photograph MUST be attached,
confirming that the B level coolant pump was originally fitted prior to replacing it with a C level coolant
pump

Ensure all procedures within the Repair manual are followed including any alignments/calibrations which are
required (Depending on vehicle specification)
10) Conduct a road test to confirm the issue is no longer evident

Warranty
Warranty Type

110 or 910

Damage Service Number

19 50

Damage Code

00 50

Coolant pressure test
Labour Operation Code

19 01 01 00

Time

10 TU

Diagnosis time
Labour Operation Code
Time

01 50 00 00
As per ODIS log (Must not exceed 30 TU)

Road test
Labour Operation Code

01 21 00 00

Time

50 TU

Bentayga
Time to replace the mechanical coolant pump and N492 assembly
Labour Operation Code
Time

19 50 19 51
70 TU

Time to remove and refit the front end module
Labour Operation Code
Time

50 38 19 00
760 TU

Continental GT/GTC
Time to replace the mechanical coolant pump and N492 assembly
Labour Operation Code

19 50 19 01

Time

250 TU

Flying Spur
Time to replace the mechanical coolant pump and N492 assembly
Labour Operation Code

19 50 19 01

Time

210 TU

Required Parts and Tools
Refer to the ETKA parts catalogue