NHTSA ID Number: 11028732
Manufacturer Communication Number: LI27.60-P-080169
TSB/Document Date: 2026-02-11
Summary
Complaint Complaints of a harsh 3to4 upshift Cause Lost torque adaptation values and negative fill times of clutch K27. Remedy Short-term measure: Note: All steps—including resetting the learned values and performing the stationary adaptation—must be completed to resolve the concern. 1. Perform IPR and follow the provided instructions. 2. Perform Special Function "Resetting of learned values 'Deceleration Mode'" (VGS > Special Procedures > Special procedure > Resetting learned values Deceleration mode) 3. Complete the standstill adaptation Long-term measure: A software resolution for software levels 22A.3 (n3g222aa03ub) and 22A.4 (n3g222aa04ub) is in development. - Check VGS control unit log or eeprom .txt file for "Program Status" If the vehicle software level is not 22A.3 or 22A.4: A software resolution will not be created for these vehicles, please follow the short term solution to alleviate the concern. Once the software is released, an update on availability will be added in IPR and in this LI document.
223 with 725.1 with ISA2 and M176 Harsh 3to4 Upshift
Topic number
LI27.60-P-080169
Version
1
Function group
27.60 - Gearshift, control
Date
2/11/26
Validity
BR223 with M176 engine and 725.1 (NAG3 Mopf) transmission with ISA2
Reason for change
Complaint
Complaints of a harsh 3to4 upshift
Cause
Lost torque adaptation values and negative fill times of clutch K27.
Remedy
Short-term measure:
Note:
All steps—including resetting the learned values and performing the stationary adaptation—must be completed to resolve the concern.
1. Perform IPR and follow the provided instructions.
2. Perform Special Function "Resetting of learned values 'Deceleration Mode'"
(VGS > Special Procedures > Special procedure > Resetting learned values Deceleration mode)
3. Complete the standstill adaptation
Long-term measure:
A software resolution for software levels 22A.3 (n3g222aa03ub) and 22A.4 (n3g222aa04ub) is in development.
- Check VGS control unit log or eeprom .txt file for "Program Status"
If the vehicle software level is not 22A.3 or 22A.4:
A software resolution will not be created for these vehicles, please follow the short term solution to alleviate the concern.
11.02.2026 16:28
© Copyright Mercedes-Benz
AG
SAHARRY
Page 1 / 3
Once the software is released, an update on availability will be added in IPR and in this LI document.
Attachments
File
Description
Sonderroutine Zurücksetzen der Lernwerte Schubbetrieb.jpg
Special Routine 'Reset Overrun Mode Learned Values'
Special procedure-Resetting learned values Deceleration Special Procedure 'Reset Overrun Mode Learned Values'
mode.jpg
Verify SW Number.png
Checking software level
Disclaimer
11.02.2026 16:28
© Copyright Mercedes-Benz AG
SAHARRY
Page 2 / 3
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Power transmission > Automatic transmission > Function > Shifts
Power transmission > Automatic transmission > Function > Poor shift quality
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
A0009022699
22A.3 for AEJ 23/1 - old SW:
A0009024595
1
CURRENTLY IN DEVELOPMENT
and pending approval / Shift quality
improvement
X
A0019029621
22A.4 for MY26; AEJ 25/1 - old 1
SW: A0019022521
CURRENTLY IN DEVELOPMENT
and pending approval - Shift quality
3-4 Robustness improvement
X
A0019029721
22A.3 for MY24 + MY25; AEJ
24/1 - old SW: A0009022699
CURRENTLY IN DEVELOPMENT
and pending approval - Shift quality
3-4 Robustness improvement
X
1
Control unit/fault code
Control unit
Fault text
N15/15 - Transmission control for 9-speed transmission
(VGS) (VGS2NAG3M)
-
Operation numbers/damage codes
Op. no.
Operation text
11.02.2026 16:28
© Copyright Mercedes-Benz AG
Time
Damage
code
Note
H
27014
Transmission adaptation
SAHARRY
Page 3 / 3
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TSB/Document ID: LI27.60-P-080169
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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