NHTSA ID Number: 11027781
Manufacturer Communication Number: LI35.31-P-074854
TSB/Document Date: 2026-01-23
Summary
Complaint Noises from the rear axle differential, particularly when cornering slowly Cause Small quantity of water entering into oil of multiplate clutches at right and left Remedy Follow below steps to install vent hose A 177 350 02 03: (See attachment section for installation instructions with reference photos if needed) 1. Raise the vehicle with the vehicle lift 2. Detach the old breathers (2x) from the clutch housing right and left using a suitable tool (Figure 1) 3. Support rear axle differential 4. Remove the rear screw from the rear axle differential on the rear axle carrier (Figure 2) Note: pay attention to the position of the adjustment disc and mark it! 5. Lower rear axle differential 6. Clean the upper bore (Figure 6) on the left side of the rear axle carrier 7. Place the new vent hose with the Y-vent connector from right to left in front of the right rear axle shaft over the rear axle differential (Figure 3) 8. Slide the angle connectors onto the vent connections onto the rear axle differential on the left (Figure 4) and right (Figure 5) 9. Install the vent connection of the new line on the left side into the upper bore (Figure 6) of the rear axle carrier (Figure 7) 10. Attach the fastening clip (pre-assembled on the new bleed line) to the rear axle differential housing. (Figure 8) 11. Lift the rear axle differential and install the screw from the rear axle carrier (M14 torque 150 Nm) Note: pay attention to the position of the adjustment disc! Once new vent hose is installed: 1. Carry out oil change of clutch oil on left and right sides (Shell TF0870B). - DO NOT change the gear set oil (at center), since this is a long-life oil that is not related to the cause Return the vehicle to the customer and inform them that they must drive a distance of at least 250 km (155mi); The complaint should no longer occur.
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TSB/Document ID: LI35.31-P-074854
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
177 118 247 AMG 45 Models - Noises from the rear axle differential, particularly when cornering slowly
Topic number
LI35.31-P-074854
Version
3
Function group
35.31 - Rear axle center assembly
Date
1/22/26
Validity
AMG-specific rear axle differential on AMG 45 model series 177; 118; 247
Reason for change
Remedy added
Complaint
Noises from the rear axle differential, particularly when cornering slowly
Cause
Small quantity of water entering into oil of multiplate clutches at right and left
Remedy
Follow below steps to install vent hose A 177 350 02 03:
(See attachment section for installation instructions with reference photos if needed)
1. Raise the vehicle with the vehicle lift
2. Detach the old breathers (2x) from the clutch housing right and left using a suitable tool (Figure 1)
3. Support rear axle differential
4. Remove the rear screw from the rear axle differential on the rear axle carrier (Figure 2)
Note: pay attention to the position of the adjustment disc and mark it!
5. Lower rear axle differential
6. Clean the upper bore (Figure 6) on the left side of the rear axle carrier
7. Place the new vent hose with the Y-vent connector from right to left in front of the right rear axle shaft over the rear
axle differential (Figure 3)
8. Slide the angle connectors onto the vent connections onto the rear axle differential on the left (Figure 4) and right
(Figure 5)
9. Install the vent connection of the new line on the left side into the upper bore (Figure 6) of the rear axle carrier (Figure 7)
10. Attach the fastening clip (pre-assembled on the new bleed line) to the rear axle differential housing. (Figure 8)
11. Lift the rear axle differential and install the screw from the rear axle carrier (M14 torque 150 Nm)
Note: pay attention to the position of the adjustment disc!
Once new vent hose is installed:
1. Carry out oil change of clutch oil on left and right sides (Shell TF0870B).
- DO NOT change the gear set oil (at center), since this is a long-life oil that is not related to the cause
Return the vehicle to the customer and inform them that they must drive a distance of at least 250 km (155mi); The
complaint should no longer occur.
23.01.2026 01:40
© Copyright Mercedes-Benz AG
SAHARRY
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Attachments
File
Description
Bild 1.jpg
Figure 1 Old breathers
Bild 2.jpg
Figure 2 Rear axle differential screw
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Bild 3.jpg
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© Copyright Mercedes-Benz AG
Figure 3 Position of new vent hose
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Bild 4.jpg
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© Copyright Mercedes-Benz AG
Figure 4 Vent connection left
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Bild 5.jpg
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© Copyright Mercedes-Benz AG
Figure 5 Vent connection right
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Bild 6.jpg
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© Copyright Mercedes-Benz AG
Figure 6 Upper bore in rear axle carrier
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Bild 7.jpg
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© Copyright Mercedes-Benz AG
Figure 7 Vent connection installed in rear axle carrier
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Figure 8.png
Figure 8 Placement of fastening clip on rear axle differential housing
Installation of Vent Hose A 177 350 02 03.pdf
Vent hose installation instructions pdf
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© Copyright Mercedes-Benz AG
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WIS-References
Document number
Title
Note
AP35.00-P-3501E
Only the clutch oil at the right and left
needs to be changed, not the gear set
oil
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
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 > Noises > Howling/whistling
Power transmission > Differential > Rear axle differential > Noises > Howling
Power transmission > Differential > Rear axle differential > Noises > Whistles
Power transmission > Noises > Humming/droning
Parts
Part number
ES1 ES2 Designation
Quantity Note
A 000 989 4406
11 CDNW
1
A177 350 0203
Vent hose
1
EPC
Sufficient for right and left side
X
X
Operation numbers/damage codes
Op. no.
Operation text
001227
Perform oil change in rear axle differential
23.01.2026 01:40
© Copyright Mercedes-Benz AG
Time
SAHARRY
Damage
code
Note
3570001
Perform oil change at both clutches
Page 9 / 9
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