Diagnostic Sheet
FROM: Maserati TSO
TO: Maserati Network

Grecale GranTurismo and GranCabrio 12 Volt
Battery Best Practices

IMPORTANT NOTICE This bulletin supersedes MAS004769_A DS 25-29 released on August 5, 2025. It
contains updated information, please ensure all previous versions are discarded.

DATE: March 17, 2026

This Technical bulletin serves as a guide and provides additional diagnostic info on the 12V Battery
as well as new updated warranty policies and exceptions.
MODELS AFFECTED: Grecale M182 (All MY), GranTurismo/GranCabrio M189 (All MY) (internal
combustion engine and Folgore BEV vehicles)
SECTION: 08.20-1 Energy generation and accumulation.

Diagnostic procedures for a “Dead Battery” concern
Please refer to “MAS004655 MCL 25-21 Battery Policy for “E-XTEQ” Maximus charger
tester” for details and best practices on how to properly test the 12V battery. Then
proceed with the instructions outlined in this bulletin.

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

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 7

TECHNICAL SERVICE OPERATIONS

MAS005057 DS 26-02

1. A BOL is NOT mandatory: But it is mandatory to attach the following documents to the Warranty Claim:
Attach a complete vehicle scan report (in pdf format), including DTCs and Parameters analyzed at vehicle
entry. Provide the Battery Test report (in PDF format) performed at vehicle entry, indicating that the battery
needs to be replaced and including the vehicle's VIN.
2. Mandatory → check for any aftermarket devices (e.g., GPS tracker, alarm). If a device is found, open a BOL
and include the brand/model, photos, and installation details. All documentation must be attached to the
BOL. Claims cannot be processed without a completed BOL report.
3. Check the battery part number (PN) and attach a picture of the label on the upper cover. In addition, it is
mandatory to provide a detailed description of the customer concern in the NOTE field of the claim.
4. BOL report should be opened as a "Support Request" ONLY in the following cases:
- Difficulty in diagnosis (after 2hrs spent).
- If an aftermarket device is found installed on the vehicle.
- In case of repeated visits for the same concern.
- If an excessive Parasitic Draw is found (At any point in time).
NOTE: Refer to the attached PARASITIC DRAW TEST (Attachments: PAGE 7) for detailed
instructions and to record the results.
NOTE: Only in case of battery replacement, it is mandatory to perform a SW update for the following modules: RFHM,
BCM and SLML/SLMR. The SW update of the modules must be done consecutively. The operation code to be used for
this SW update is: 9.99.000.B (0.40 h).

Warranty Reimbursement Request up to MY24
**Always check warranty coverage in the White Book before submitting a battery replacement or
recharge claim.**
Complete the warranty request as follows:

Description

Code

Warranty code

16

Defect code

122

Component Code

8.20.001

Spare Parts

Please, check the correct battery Part Number in Tech Doc

Operation Code*
▪

Battery test

0.20.046.0 (0.15 h)

▪

Battery replacement
o

Grecale ICE/MHEV

8.20.001.0 (0.15 h)

o

GT and GC ICE

8.20.001.1 (0.10 h)

▪

OBD/EOBD check

0.20.013.0 (0.20 h)

▪

SW update

9.99.000.B (0.40 h)

* For battery charging only (not replacement), the operation codes to be used are:
•

0.20.046.0 (BATTERY TEST)

•

0.20.013.0 (OBD/EOBD check)

• 0.10 of Straight Time for charging.
In this case, it is mandatory to attach a second battery test report to the claim to verify the charging.
NOTE: Maserati reserves the right to modify or cancel claims that do not meet the criteria outlined in this
communication and, if necessary, to correct and adjust them based on market averages.
© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

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 7

TECHNICAL SERVICE OPERATIONS

Up to MY24 vehicles:

1. A BOL is MANDATORY: Submit a BOL and complete the MANDATORY → CUSTOMER USAGE AND ROAD
ASSISTANCE INFORMATION QUESTIONNAIRE and the DIAGNOSTIC CHECKLIST (Attachments: PAGES 4-6)
and attach it to the Blue Online (BOL). If a parasitic draw is suspected, then perform the parasitic draw checklist
on the last page of this bulletin and attach results to the BOL as well.
2. Check (ModisCS+ → Service Entry → Campaign Tab) to see if the vehicle is involved in the following
Rapid Updates :
- For Grecale: MAS004696 Rapid Update (RU) #735 – Electric Absorption Improvement
- For GranTurismo/GranCabrio: MAS004778 Rapid Update (RU) #791 – Battery Draw Improvement

3. If the vehicle is involved in RU 735 (Grecale) or RU 791 (GranTurismo/GranCabrio) but the SW
update is not yet performed: Follow the instructions per the Rapid Update that apply to the vehicle.
Open a Blue On Line ticket as “Factory Information” and attach all required documentation from Step 6.

4. If the vehicle is NOT involved in RU 735 (Grecale) or RU 791 (GranTurismo/GranCabrio):
Open a Blue On Line ticket under “Factory Information”, attach all required documentation from
Step 6, and wait for BOL instructions before updating the following modules:
• RFHM
• BCM
• SLML/SLMR
Use operation code 9.99.000.B (0.40 h).
5. If the vehicle has already received RU 735 or RU 791, or already has the latest software
version for RFHM, BCM, and SLML/SLMR:
- Open a Blue On Line case under “Support Request” for further analysis, attach all required
documentation from Step 6.
6. All BOL submissions must include the following attachments:
•

All completed checklists per step 1.

•

All battery tests performed (Must attach printouts).

•

A complete Vehicle Scan Report before and after the software updates.

Please make sure that all requested info is attached to the BOL to avoid possible further review or
warranty rejection. For details see bulletin MAS004908_A PNP 25-07 Warranty Claim Attachment
Requirements (Or Newer).

Warranty Reimbursement Request from MY25
Only the operations listed in this publication are eligible for warranty approval. Any additional operation
requests will be rejected.
Description
Component Code
Operation Code

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

Code
8.20.001
8.20.001.D (1.8 h)

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 7

TECHNICAL SERVICE OPERATIONS

MY25 and newer vehicles:

OPERATIONS
TECHNICAL SERVICE OPERATIONS

ATTACHMENTS – 12 VOLT BATTERY DIAGNOSTIC CHECKLISTS
CUSTOMER USAGE AND ROAD ASSISTANCE INFORMATION QUESTIONNAIRE
(Checklist to be filled out by dealer if customer experienced a “Dead Battery” event)
ROAD ASSISTANCE INFORMATION
Was the vehicle Jump Started?
Battery cables attached to the battery posts loose?

YES

NO

YES

NO

QUESTIONNAIRE FOR THE CUSTOMER
Where was the vehicle Parked at the time of battery discharge?
Vehicle doors closed/locked?

YES

NO

Did the vehicle open using the Key FOB?

YES

NO

YES

NO

YES

NO

Has the customer noticed that the digital clock, comfort display, or backlighting of the
instrument cluster comes on when the car is closed?
Did the customer notice any malfunctions when the battery was discharged?
(e.g., Malfunction warning indicators lights or messages in the cluster)
If yes, which ones
(Describe in detail)
Check with the customer whether Customer Feedback:
the car may have erroneously been
left with the ignition ON (Refer to
MAS003511)
Vehicle recently been moved, or has been parked for an
extended period of days?

If YES, how many Days/Hours

NO

How many miles per day does the customer travel on average?

Miles
City
City & Highway
Highway

Type of route used most
frequently (insert flag)

Does the customer usually use the radio at KEY OFF?
After KEY OFF, does the customer leave electrical devices connected (USB or 12V devices)?

YES
YES

NO
NO

Were the key FOBs left in the vehicle?
How far away from the vehicle were the key FOBs outside the vehicle?

YES

NO

GPS tracker or other aftermarket KIT installed on the car?

YES

If YES, which ones
(Describe in detail)
FT
NO

If yes, which ones
(Describe in detail)
Was the car left with the parking lights on?

YES

NO

Connected Services Subscription Activated?

YES

NO

Has the customer noticed the engine cooling fan turning ON with the engine OFF?

YES

NO

Was the vehicle washed or exposed to rain before the discharge event?

YES

NO

What features or APPs of the radio did the customer use before the discharge event?

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

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 7

%

What was the High Voltage Battery charge status?
Has the HV battery been recharged recently or just before the 12V Battery discharge event?
YES

NO

AC

DC

YES

NO

How was the high-voltage battery charged?
The front hood was closed during the High Voltage recharge?

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

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 7

TECHNICAL SERVICE OPERATIONS

(CUSTOMER QUESTIONNAIRE CONTINUED) FOLGORE (BEV) ONLY RELATED QUESTIONS

To be performed ONLY after the vehicle has been sold and or AFTER PDI has been performed and the vehicle
stored for a long time.
ATTENTION! DO NOT DISCONNECT BATTERY CABLES OR IBS (until completion of the checklist)
The disconnection of the battery on connected (Active Maserati Connected Service) vehicles generates the
activation of the "STOLEN” mode by the TBM with a parasitic draw of approximately 150 mA for 8 hours after
the battery has been re-connected
Provide the 12V battery value recorded during PDI (attach the PDI checklist)
Volts
Provide an E-XTEQ Battery test printout performed at vehicle entry.
If the car is in PDI, indicate how many days it has been in stock and how often the battery check and recharge
procedure has been performed. Attach CHECKLIST FOR LONG-TERM OPERATIONS (not for Folgore)
Check the status of the following Rapid update actions upon entry of the vehicle:
(Circle “N/A” if the RU does not apply to the VIN)

Rapid Update 735

N/A

Done

Not Done

Rapid Update 791

N/A

Done

Not Done

Check for the presence/ installation of any aftermarket devices (GPS
tracker, alarm). If present, indicate brand/model and attach pictures
of the device and related installation

Brand/model:

Check the Battery production date attaching a picture of the hot
printed code on the upper cover

Code:

Check battery PN and attach a picture of the label on the upper cover

PN:

Did the Flat battery event occur while in Logistic Mode or Customer
Mode?

YES

NO

Logistic Mode
YES

NO

Battery post terminals free of corrosion or mechanical anomalies?

YES

NO

Is the battery post terminal secure and not loose?

YES

NO

Are SW updates available?

YES

NO

Check the position of the external lights selector (auto, manual) and if the lights stay ON.

YES

NO

YES

NO

Customer Mode

Check for SW updates previously performed on the car. Updated ECUs:

Check the radio power off delay, indicating in minutes (3,6, or 12min selectable in the MIA

min

MANDATORY: Attach a complete vehicle scan (DTC and Parameter) report of ALL modules
If the outcome of the battery test indicates that the battery needs to be re-charged, carry out a complete
charging cycle. Attach a picture of the battery charger display at the beginning and end of charging, including
the final printout.
If the car is in PDI, indicate how many days it has been in stock and how often the battery check and recharge
procedure has been performed. Attach CHECKLIST FOR LONG-TERM OPERATIONS last page of MAS004488 MCL
25-15 MGNT And MAINT Of In-stock Vehicles

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

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 7

TECHNICAL SERVICE OPERATIONS

DIAGNOSTIC CHECKLIST

PARASITIC DRAW TEST
ATTENTION! The disconnection of the battery on connected (Active Maserati Connected Service) vehicles
Activates the “STOLEN” mode by the TBM with a parasitic draw of approximately 150 mA for 8 hours after the
battery has been re-connected. To prevent this, follow the procedure below.

12V Battery Preconditions:
If the outcome of the battery test indicates that the battery needs to be re‐charged, carry out a complete
charging cycle. Attach a picture of the battery charger display at the beginning and end of charging.
(If possible, also add a picture after 3 hours of charging)
(In case of usage of no smart charger, the re-charging will have to last at least 8 hours)

Parasitic Draw Preconditions:
1)
2)
3)
4)
5)
6)
7)

12V Battery adequately charged (12.5V or above)
All doors closed the exception of the rear trunk/Tailgate
Interior and exterior lights must be OFF
All Keys out of detection range (more than 16 FT)
The rear Trunk opened, and the latch manually closed
No electronic device connected to USB ports or OBD connector
Lock the car by the key fob and remove it from the detection range
(more than 16 FT)
8) Wait at least 10 minutes (Vehicle Sleep Mode)
9) Use a digital multimeter and connect leads to the negative battery
post and a clean chassis ground.
10) Disconnect the quick connector of the negative battery cable while
keeping both the multimeter leads connected to the negative
battery post and chassis ground.

© 2026 Maserati Americas.
Aftersales
www.maseratiusa.com

MAS005057

Record the results every 30 min up
to 90 minutes below:

1) 30 min_______mA
2) 60 min_______mA
3) 90 min_______mA

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 7

TECHNICAL SERVICE OPERATIONS

IMPORTANT: the disconnection of the battery on connected (Active Maserati Connected Service)
vehicles generates the activation of the "STOLEN” mode by the TBM with a parasitic draw of
approximately 150 mA for 8 hours after the battery has been re-connected. It is important to prevent
this from occurring when performing a parasitic draw test. Because of this, we suggest that you follow the
procedure below when diagnosing a vehicle with a suspected excessive parasitic draw: