NHTSA ID Number: 11014333
Manufacturer Communication Number: MAS004558 DS 25-03
TSB/Document Date: 2025-02-18
Summary
This Diagnostic Sheet serves as a guide and provides additional diagnostic info for possible MC20 gearbox anomalies and possible lower-level repair now available. Maserati
also introduced a new Procedure available through the MDEVO called “DCTM Service Fast Learn”. This new routine could be used to address issues related to sticky valve and performs a purge cycle and a valve readaptation to address pressure related issues.
Diagnostic Sheet
FROM: Maserati TSO
TO: Maserati Network
MC20 – Gearbox diagnosis and repairability
DATE: February 4, 2025
This Diagnostic Sheet serves as a guide and provides additional diagnostic info for possible MC20
gearbox anomalies and possible lower-level repair now available. Maserati also introduced a new
Procedure available through the MDEVO called “DCTM Service Fast Learn”. This new routine could
be used to address issues related to sticky valve and performs a purge cycle and a valve
readaptation to address pressure related issues.
SECTION: 03.10 - 1 GEARBOX HOUSINGS
MODEL: M240 MC20 & MC20 Cielo from MY23 (on MY22 the DCTM Service Fast Learn procedure is not available
due to a technical constraint related to DTCM SW version)
CONCERN: Gearbox warning light on and storage in DCTM of one or multiple of the following DTCs.
DTC Type DTC Code DTC naming SAE_J2012
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
© 2025 Maserati North
America. Aftersales
www.maseratiusa.com
P0746
P0747
P0776
P0777
P0796
P0797
P080E
P0867
P0868
P0869
P2714
P2715
P2723
P2724
P2808
P2809
P2817
P2818
P2853
P2854
P2855
P2856
P2A18
P2A19
P07E4
P07E6
Pressure Control Solenoid "A" Performance/Stuck Off
Pressure Control Solenoid "A" Stuck On
Pressure Control Solenoid "B" Performance/Stuck Off
Pressure Control Solenoid "B" Stuck On
Pressure Control Solenoid "C" Performance/Stuck Off
Pressure Control Solenoid "C" Stuck On
Transmission System Pressure Relief Valve Performance
Transmission Fluid Pressure
Transmission Fluid Pressure Low
Transmission Fluid Pressure High
Pressure Control Solenoid "D" Performance/Stuck Off
Pressure Control Solenoid "D" Stuck On
Pressure Control Solenoid "E" Performance/Stuck Off
Pressure Control Solenoid "E" Stuck On
Pressure Control Solenoid "G" Performance/Stuck Off
Pressure Control Solenoid "G" Stuck On
Pressure Control Solenoid "H" Performance/Stuck Off
Pressure Control Solenoid "H" Stuck On
Clutch "A" Pressure Discharge Performance
Clutch "B" Pressure Discharge Performance
Clutch "A" Pressure Charge Performance
Clutch "B" Pressure Charge Performance
Limited Slip Differential Pressure Too High
Limited Slip Differential Pressure Too Low
Unable to Engage Park
Stuck in Park
MAS004558
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 3
TECHNICAL SERVICE OPERATIONS
MAS004558 DS 25-03
© 2025 Maserati North
America. Aftersales
www.maseratiusa.com
P2820
P2821
P08C4
P08C5
P27B9
P27BA
P27C1
P27C2
P27C9
P27CA
P27D1
P27D2
P2829
P282A
P284D
P284E
P284F
P2850
P286A
P072B
P072C
P072D
P072E
P072F
P073A
P073B
P073C
P073E
P073F
P074A
P074B
P074C
P074D
P074E
P074F
P07D7
P07D8
P1CAD
P1CAE
P1CAF
P1CB1
P1CB2
P1CB3
Pressure Control Solenoid "J" Performance/Stuck Off
Pressure Control Solenoid "J" Stuck On
Pressure Control Solenoid "M" Performance/Stuck Off
Pressure Control Solenoid "M" Stuck On
Pressure Control Solenoid "N" Performance/Stuck Off
Pressure Control Solenoid "N" Stuck On
Pressure Control Solenoid "P" Performance/Stuck Off
Pressure Control Solenoid "P" Stuck On
Pressure Control Solenoid "R" Performance/Stuck Off
Pressure Control Solenoid "R" Stuck On
Pressure Control Solenoid "S" Performance/Stuck Off
Pressure Control Solenoid "S" Stuck On
Pressure Control Solenoid "K" Performance/Stuck Off
Pressure Control Solenoid "K" Stuck On
Shift Fork "A" Unrequested Movement
Shift Fork "B" Unrequested Movement
Shift Fork "C" Unrequested Movement
Shift Fork "D" Unrequested Movement
Shift Fork "E" Unrequested Movement
Stuck In Reverse
Stuck in Gear 1
Stuck in Gear 2
Stuck in Gear 3
Stuck in Gear 4
Stuck in Gear 5
Stuck in Gear 6
Stuck in Gear 7
Unable to Engage Reverse
Unable to Engage Gear 1
Unable To Engage Gear 2
Unable To Engage Gear 3
Unable To Engage Gear 4
Unable To Engage Gear 5
Unable To Engage Gear 6
Unable To Engage Gear 7
Stuck in Gear 8
Unable To Engage Gear 8
Gear Shift Actuator 1 Disengage Failure
Gear Shift Actuator 2 Disengage Failure
Gear Shift Actuator 3 Disengage Failure
Gear Shift Actuator 1 Engage Failure
Gear Shift Actuator 2 Engage Failure
Gear Shift Actuator 3 Engage Failure
MAS004558
All rights reserved. Reproduction or translation in
whole or in part is not permitted without
authorization from the publisher. Printed in USA
TECHNICAL SERVICE OPERATIONS
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Page 2 of 3
Please refer to the diagnostic path below:
1)
Read DTCs stored in DCTM (save a complete vehicle scan report DTC+ Parameters)
2)
If DTCs stored in DCTM are included in the above table, perform the diagnostic procedure.
DCTM → Procedures → DCTM Service Fast Learn
3)
4)
Road test the car and check if the complained anomaly and related DTCs could be reproduced.
•
If the anomaly does not appear anymore, replace Gearbox oil and filter, road test again the
car and in case of good outcome the car could be delivered back to the customer.
•
If the anomaly and DCTM DTCs appear again, save a complete vehicle scan report DTC+
Parameters.
-
If DTC stored in DCTM is classified as Type1 (according to the above table), go to Step 4)
-
If DTC stored in DCTM is classified as Type2 (according to the above table), go to Step 5)
Replace Mechatronic Assembly + gearbox Oil and filter (component #54 in table 03.10.1 Gearbox
housings).
After installing the new parts, perform again the diagnostic procedure DCTM → Procedures → DCTM
Service Fast Learn.
Road test the car and check if the complained anomaly and related DTCs could be reproduced.
5)
•
If the anomaly does not appear anymore, the car could be delivered back to the customer.
•
If the anomaly and DTCs appear again, the complete Gearbox needs to be replaced (save
a complete vehicle scan report DTC+ Parameters).
Perform and record in pdf an acquisition of below indicated DCTM parameters to identify the causal
component.
1F35 - System Pressure Sensor Raw with Zero Correction
1EFA - System Pressure Sensor Raw
1F37 - System Pressure Target
NOTE: System Pressure should maintain between 20 and 30 bar of pressure when the engine is running
or driving the car, the “commanded” pressure will vary in this range depending on torque requirements.
For diagnostics we look for pressure oscillation or frequent pressure drops below 5 bar indicating the
system pressure control valve is having trouble maintaining stable pressure.
•
If the System Pressure is stable, the complete Gearbox needs to be replaced.
•
If the System Pressure is unstable, go to Step 4)
It is required to open a Blue on Line as Support Request by providing evidence and step by step outcome
of the above indicated diagnosis.
REPAIR NOTE: In case of Mechatronic Assembly replacement, only screws PN 673016908 (component #55
in table 03.10.1 Gearbox housings) they do not necessarily need to be replaced but they can be re
installed.
Please do not hesitate to contact us for any questions you may have.
Kind regards,
TECHNICAL SERVICE OPERATIONS
© 2025 Maserati North
America. Aftersales
www.maseratiusa.com
MAS004558
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 3
TECHNICAL SERVICE OPERATIONS
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TSB/Document ID: MAS004558 DS 25-03
Replacement Service Bulletin Number:
MFR Communication Date: 2025-02-04
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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