NHTSA ID Number: 11020986
Manufacturer Communication Number: MAS004781 MCL 25-37
TSB/Document Date: 2025-07-30
Summary
We are pleased to inform you that we have published the updated version of the "Introduction to the New Maserati
GranTurismo" on ModisCS+. This update supersedes the previous circular letter MAS003504 and includes additional content related to the new GranCabrio. Our new Parts & Service mission is dedicated to ensuring a unique experience for our customers. This letter outlines important guidelines for the technical management of the new Maserati GranTurismo and GranCabrio. Developed at the Maserati Innovation Lab and manufactured at the Mirafiori Plant in Turin, the GranTurismo and GranCabrio are 100% made in Italy and embody Maserati's "Italian luxury performance" concept. Both models feature the revolutionary Neptune V6 engine in two variants: the Modena version with a 3.0-liter V6 Neptune Twin Turbo delivering 490 hp, and the highperformance Trofeo version based on the same engine, achieving a peak output of 550 hp.
TECHNICAL SERVICE OPERATIONS
MAS004781 MCL 25-37
Circular Letter
FROM: Maserati TSO
TO: Maserati Network
Introduction to the new
Maserati GranTurismo & GranCabrio
IMPORTANT NOTICE This bulletin supersedes MAS003827_A MCL 24-34 released on June 27, 2024.
It contains updated information, please ensure all previous versions are discarded.
DATE: JULY 25, 2025
We are pleased to inform you that we have published the updated version of the "Introduction to
the New Maserati GranTurismo" on ModisCS+. This update supersedes the previous circular letter
MAS003504 and includes additional content related to the new GranCabrio.
Our new Parts & Service mission is dedicated to ensuring a unique experience for our customers. This
letter outlines important guidelines for the technical management of the new Maserati GranTurismo
and GranCabrio.
Developed at the Maserati Innovation Lab and manufactured at the Mirafiori Plant in Turin, the
GranTurismo and GranCabrio are 100% made in Italy and embody Maserati's "Italian luxury
performance" concept. Both models feature the revolutionary Neptune V6 engine in two variants:
the Modena version with a 3.0-liter V6 Neptune Twin Turbo delivering 490 hp, and the highperformance Trofeo version based on the same engine, achieving a peak output of 550 hp.
This document includes in detail:
•
•
•
•
•
Vehicle maintenance and periodic battery checks.
Indications of best practices and technical notes for Service.
Pre-Delivery inspection checklist.
Activation of the technical team.
Unveiling tech-doc/diagnosis and special tools.
Please read and review this bulletin first before starting the procedure.
Contact your Regional AfterSales Manager (RAM) or the Technical Support Helpdesk if you have
any questions.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 1 of 8
1
Vehicle maintenance and periodic battery checks…………………………………………….2
1.1
12V Battery Inspection at PDI……………………………………………………………………2
1.2
Check/ restore 12V battery SOC...……………………………………………………………..2
2
Best practices in the workshop for service………………………………..……………………….3
2.1
Lifting the vehicle………………………………………………………………………………….3
2.2
Door opening………………………………………………………………………………………4
2.3
12V battery location………………………………………………………..…………………….5
2.4
Disconnect the 12V battery negative cable………………………………………………..6
2.5
Emergency start - dead battery……………………………………………………………….6
2.6
Transmission Park Release……………………………………………………………………….6
3
Pre-Delivery inspection checklist…………………………………………………………………...7
4
Activation of the technical team……………………………………………………………………7
5
Technical Documents and Special Tools...………………………..………………………………8
5.1
5.2
Technical Information..…………………………………………………………………………...8
Special Tools…………………………………………………………………………………………..8
1 Vehicle maintenance and periodic battery checks
The specifics on the maintenance of the vehicles in stock are reported as usual in the dedicated
circular letter, which undergoes periodic updates (MAS003825 and its subsequent revisions). In
particular, the new Maserati GranTurismo features require more restrictive 12V battery charge
status control logistics than other models in the Maserati family. The checks involve:
-
Performing a Battery test using the E-XTEQ MAXIMUS at PDI.
Performing a Battery test using the E-XTEQ MAXIMUS during the entire storage period.
1.1 12V Battery Inspection at PDI
Performing a Battery test following the procedures outlined in bulletin “MAS004655 MCL 25-21
Battery Policy for “E-XTEQ” Maximus charger tester (Or Newer)
1.2 Check/ restore 12V battery State Of Charge (SOC)
Performing a Battery test using the E-XTEQ MAXIMUS during the entire storage period at Intervals
outlined in “MAS003825 MCL 24-13 MGNT And Maintenance Of Instock Maserati Vehicles”.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 2 of 8
TECHNICAL SERVICE OPERATIONS
Contents
After vehicle transport delivery from the port, and after removing the bodywork wrapguard, it is
necessary to check the absence of textile residues and dirt on the canvas soft top. To remove
residues from the soft top, you can use an adhesive roller. Do not wash the GranCabrio unless you
have first checked that the soft top is clean and intact (the presence of foreign bodies can cause
damage to the soft top).
2 Best practices in the workshop for service
The following chapter includes a list of best practices and technical notes for Maserati GranTurismo
Service; this vehicle’s features require precautions that may otherwise not be noticed or
highlighted while the car is undergoing normal operations in the workshop.
2.1 Lifting the vehicle
The position of the lifting points is indicated by an inverted triangle stamped on the edge of the body.
There are also vehicle side pads for interfacing the axle positioning.
Front pad
Rear pad
Be careful about the axle geometry to
prevent damaging the vehicle during
the lifting operation. We recommend
removing all possible loads from the
vehicle (passengers, luggage, spare tire,
etc.) to increase the distance from the
ground (in case there are no air springs).
We recommend using lift plates with a
diameter no greater than 125mm for the
front axle and centering the plate on
the lifting dowel as well as possible to
prevent contact with the car’s floor trim.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 3 of 8
TECHNICAL SERVICE OPERATIONS
Vehicle Transport Delivery
Door Opening
The following diagram summarizes the instructions in the On-board Documentation concerning the
door opening controls:
Opening using a
Bowden:
internal unlocking
lever located on
the driver's area
dashboard
From outside:
press the button
shown on the key
twice within 5
seconds or press
the button on the
door
GranTurismo
From outside:
touch the inside
part of the
handle
From inside:
1. Emergency
opening
handle
2. Electronic
door
lock/unlock
button
From inside:
Press the button
on the upper
console
The tailgate is
moved
electronically
Opening by
Bowden:
internal unlocking
lever located on
the driver's area
dashboard
From outside:
press the button
shown on the key
twice within 5
seconds or press
the button on the
liftgate
GranCabrio
From outside:
touch the inside
part of the
handle
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
From inside:
1. Emergency
opening
handle
2. Electronic
door
lock/unlock
button
From inside:
Press the button
on the upper
console
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 4 of 8
TECHNICAL SERVICE OPERATIONS
2.2
The liftgate can be opened mechanically from inside the vehicle by pulling the glow-in-the-dark
emergency release lever located on the inside of the trunk lid trim.
The movement of the GranCabrio's soft top is controlled by an electro-hydraulic system, which can be
activated using the dedicated controls on the central display of the vehicle. The opening/closing
movement of the soft top can be interrupted by stopping applying pressure on the control; however, it
is recommended to always carry out the complete opening or closing cycle, unless strictly necessary;
this is because after approximately 7 minutes the electro-hydraulic movement system deactivates,
leaving the soft top free to move if it is not in the stable position of complete opening or closing; this
condition, if not controlled, can lead to a risk to personnel and the car itself. Please also note that, in
the event of failure of the automatic movement system, the soft top can be moved manually; for all
the details about the emergency handling procedure, please refer to the on-board documentation.
2.3
12V Battery location
The battery is in the inner middle side of the trunk. To access the battery, lift the panel on the bottom of
the boot and remove the toolbox.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 5 of 8
TECHNICAL SERVICE OPERATIONS
The electric locks cannot be powered if the 12 V battery is dead. The key fob has an emergency
mechanical key that can unlock the driver’s side door with a lock corresponding to the handle itself, as
shown in the figure below:
Disconnect the 12V Battery negative cable.
If you need to disconnect the 12V battery negative cable (for example, due to long vehicle inactivity),
you can access it by removing the bottom cover of the rear trunk:
2.5
Emergency start - dead Battery
If an emergency start is needed for a dead battery, the remote poles located in the engine
compartment can be used, as indicated in the following figures:
2.6
Transmission Park Release
If you need to move the car with the engine off, the “Car Wash” mode can be activated.
As shown below:
-
The car must be on a level surface, not moving.
Put the transmission in N (Neutral) by using the control on the dashboard.
-
Turn the engine off by pressing the START/STOP button.
The driver’s door must be shut during these steps. This condition must be maintained for about 15
minutes, after which the transmission moves to P (Park).
If this solution is not possible or if there are other transmission problems, the transmission can be
released manually as follows:
-
Lift the car just enough to be able to reach the inside central area.
Identify the automatic transmission and the release actuator lever.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 6 of 8
TECHNICAL SERVICE OPERATIONS
2.4
TECHNICAL SERVICE OPERATIONS
Warning: the transmission park release lever actuator is not in the car: you need to use an M6
screw at least 32.4 mm long.
3 Pre-Delivery Inspection Checklist
To support you in delivering the new Maserati GranTurismo/GranCabrio, we have developed a specific
Checklist, adding new checks to test the new features and ensure that the customer can drive the car
with maximum satisfaction. In addition, some policies regarding the control of the charge status of the
12V battery have been modified. The PDI CHECKLIST is included with this bulletin in Modis.
The Checklist will guide you through the various stages of vehicle inspection and preparation. Each
Checklist includes a set of actions and procedures to be carried out on each car during the PDI.
At the end of each car preparation, we ask you to keep a copy of the Checklist, signed by the technician
who has performed the checks, to support process traceability that could be helpful to improve the quality
of the service offered, where necessary. Maserati could also request a copy of the same during the
contractual warranty period for statistical purposes for its product improvement processes.
PDI procedure to carry out with MDEvo
The warranty start date and “Customer Mode” setting to be performed during PDI are described in
Circular Letter MAS003368 (and corresponding updates).
4 Activation of the technical team
A cross-functional Technical Team has been established, comprising individuals from Product Support,
Engineering, Quality, Spare Parts, Customer Care, and RAM departments. In addition to introducing
innovative technical content, the team is dedicated to offering comprehensive support for accurate
diagnosis and resolution during initial interventions within the network. Furthermore, they aim to
conduct swift and effective investigations into all reported anomalies. For details on submitting BOLs
to report anomalies, please consult the latest "Blue On Line Policy Update" Bulletin.
To monitor the correct progress of the vehicle repair on new models and ensure corrective action for
anomalies found during PDI. Maximum care is required in manually setting the Service Entry status.
Please also remember that the Service Entry status is automatically set up in "Awaiting Spare Parts"
when the parts to be replaced are related to interventions covered by the contractual warranty and
ordered in VOR mode. With a view to product improvement and to allow Maserati to improve the
diagnostic effectiveness, you will also need to analyze promptly the defective components replaced.
For this purpose, applying the following indications for the entire duration of the Technical Team is
required:
1. Warranty claim must be entered within two working days of closing the Service Entry.
2. Components replaced and requested for urgent return must be sent within two working days of
receiving the request. Please refer to the Maserati warrant urgent parts return bulletin in Modis for
details.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 7 of 8
5.1
Technical Information
TechDocs has been updated to include technical documentation for the new GranTurismo:
5.2
•
•
•
•
Parts catalog
Labor Times
Workshop Manual
Wiring Diagrams
•
Diagnostic Help
Special Tools
Maserati has created a set of special tools specifically for the new GranTurismo and GranCabrio to ensure
the highest levels of quality in driving assistance and safety. Such mandatory tools will be supplied
automatically and will also be present on the ModisCS+ Special Tool Catalog. The tools created are listed
below in the table, along with a brief technical description:
Maserati P/N
900030939
(900030834+900084564)
WSM tools
Engine-transmission removal tool upgrade
900030836
Rear axle removal tool upgrade
900030837
900030838
Manual liftgate lock release tool
Instrument cluster release tool
900030839
Front-wheel toe-in tool
900030842
Tensioner
900030800
Damper anti-torque removal and refitting
900030841
Hub nut tool lever
Maserati P/N
Bodywork jigs
900030843
Global Jig Kit
900030844
CarBench Jig Kit
Maserati P/N
Soft Top Tools
900100010
Soft top support rod
900100009
Soft top fixing brackets
•
Engine-transmission removal tool upgrade (900030939): This front removal tool upgrade will be used for
removing and refitting the engine and transmission.
•
Rear axle towing tool upgrade (900030836): This rear axle towing tool upgrade will be used for assembling and
disassembling the rear suspension chassis.
•
Manual liftgate lock release tool (900030837): This tool allows the liftgate to be opened from the compartment
in the center of the rear seats.
•
Instrument cluster release tool (900030838): This tool allows the instrument cluster to be removed without
damaging the display.
•
Front-wheel toe-in tool (900030839): This tool allows the correct torque tightening of the front wheel toe-in tie
rod nut after aligning the car.
•
Tensioner (900030842): This tool allows the manual handling of the belt tensioner for removal and refitting.
•
Damper anti-torque removal-refitting (900030800): This tool is used to create the necessary counter-torque
when removing the engine damper.
•
Hub nut tool lever (900030841): This tool is an upgrade of PN 900029761 and allows easier use. The tool
introduced for M189 applies to all other cars where 900029761 is required.
•
M189 CarBench Jig Kit (900030844): To be used with the jigs already in the workshop’s possession, will allow you
to check and repair the bodywork of the car correctly for both engine versions.
•
M189 Global Jig Kit (900030843): To be used with the templates already in the workshops’ possession, will allow
you to check and repair the vehicle's bodywork correctly for both engine versions.
© 2025 Maserati Americas.
Aftersales
www.maseratiusa.com
MAS004781
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
Page 8 of 8
TECHNICAL SERVICE OPERATIONS
5 Technical Documents and Special Tools
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TSB/Document ID: MAS004781 MCL 25-37
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-25
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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