NHTSA ID Number: 11028270
Manufacturer Communication Number: LI27.10-P-075869
TSB/Document Date: 2026-02-04
Summary
Complaint Only vehicles with a variable transfer case are affected. This can be identified through control unit N45 or N15/7 in the quick test. When accelerating with light load, vibrations or jolting sensation may come from the drivetrain. It may be mistaken for a harsh shift. Cause Modified oil quality of the transfer case over time Remedy 1. Check initial quick test for faults in the following control units. N45 or N15/7 - All-wheel drive (ARS) N127 - 'Drivetrain' (PTCU) control unit Y3/8 - Transmission control for 9-gear transmission (VGS) N3/10 - Engine electronics for combustion engine If faults are present: Process them as per the guided test in Xentry. If no faults are present: 2. Check the transmission oil level If the oil level is correct: 3. Unplug the connector for the transfer cases control unit and reassess the vehicle on a subsequent test drive If the complaint no longer occurs with the control unit disconnected: 4. Perform an oil change of the transfer case according to WIS specifications - Collect an oil sample of the original fluid 5. Complete all transfer case Tech-in processes located under VG Control Unit > Adaptations - Resetting the oil service data - Calibration of N15/7 5. Perform road test of vehicle to bring transmission to operating temperature ( >60C ) 6. Operate vehicle in full circle with steering at full lock - 5x to the left - 5x to the right Return the vehicle to the client and request they drive the vehicle for at least 200 miles and return if the concern is not resolved. The extended drive will ensure the clutches are properly conditioned with the new oil and should resolve the concern. If the concern continues to occur with the control unit disconnected or after the above steps have been performed, please submit a TIPS case to the Powertrain inbox with the following information: - Initial quick test with fault freeze frame data - Initial transmission EEPROM data - VGS and Transfer Case Control Unit Log (N45 or N15/7) - Photo of the original oil condition - What color was the fluid drained from the transfer case before the oil change? - Was an oil sample collected, and can you provide a photo of the original fluid? - What color and part number fluid was used during the oil change? - How far was the vehicle driven after?
Vibration or Jolt when accelerating from the drivetrain
Topic number
LI27.10-P-075869
Version
6
Function group
27.10 - Complete transmission
Date
2/3/26
Validity
Passenger cars with variable transfer case, identifiable in
the quick test with control unit N15/7 or N45
Reason for change
Updated Remedy after step 6
Complaint
Only vehicles with a variable transfer case are affected. This can be identified through control unit N45 or N15/7 in the
quick test.
When accelerating with light load, vibrations or jolting sensation may come from the drivetrain. It may be mistaken for
a harsh shift.
Cause
Modified oil quality of the transfer case over time
Remedy
1. Check initial quick test for faults in the following control units.
N45 or N15/7 - All-wheel drive (ARS)
N127 - 'Drivetrain' (PTCU) control unit
Y3/8 - Transmission control for 9-gear transmission (VGS)
N3/10 - Engine electronics for combustion engine
If faults are present:
Process them as per the guided test in Xentry.
If no faults are present:
2. Check the transmission oil level
If the oil level is correct:
3. Unplug the connector for the transfer cases control unit and reassess the vehicle on a subsequent test drive
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AG
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If the complaint no longer occurs with the control unit disconnected:
4. Perform an oil change of the transfer case according to WIS specifications
- Collect an oil sample of the original fluid
5. Complete all transfer case Tech-in processes located under VG Control Unit > Adaptations
- Resetting the oil service data
- Calibration of N15/7
5. Perform road test of vehicle to bring transmission to operating temperature ( >60C )
6. Operate vehicle in full circle with steering at full lock
- 5x to the left
- 5x to the right
Return the vehicle to the client and request they drive the vehicle for at least 200 miles and return if the concern is not
resolved. The extended drive will ensure the clutches are properly conditioned with the new oil and should resolve the
concern.
If the concern continues to occur with the control unit disconnected or after the above steps have been performed,
please submit a TIPS case to the Powertrain inbox with the following information:
- Initial quick test with fault freeze frame data
- Initial transmission EEPROM data
- VGS and Transfer Case Control Unit Log (N45 or N15/7)
- Photo of the original oil condition
- What color was the fluid drained from the transfer case before the oil change?
- Was an oil sample collected, and can you provide a photo of the original fluid?
- What color and part number fluid was used during the oil change?
- How far was the vehicle driven after?
WIS-References
Document number
Title
Note
AP28.00-P-2801B
Transfer case - oil change
Please note the corresponding model
series
Disclaimer
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
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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 > Function > Jolting/shuddering during start-off
Power transmission > Function > Vibrates
Power transmission > Automatic transmission > Function > Shuddering during start-off
Power transmission > Automatic transmission > Function > Shudders
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
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Damage
code
Note
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TSB/Document ID: LI27.10-P-075869
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-03
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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