NHTSA ID Number: 11018588
Manufacturer Communication Number: LI61.20-P-077105
TSB/Document Date: 2025-05-27
Summary
Complaint Cracking/clicking noise from underbody when driving slowly (around curves); see attachment. Cause Potential causes: • Assembly of the underfloor paneling with unloaded body (results in tension after compression of vehicle in K0- design level) • Relative movement between front and rear engine compartment lining • Torque loss of the screw connection • Accumulation of stones and dirt Remedy • Screw connection in K0-design level (vehicle sitting on ground on it's own weight) and taking into account the correct screw sequence • Additional screw connection points (minimization of relative movement) • Increase in tightening torque • Integration of spacer rings (reduction of accumulation of stones and dirt) In order to rule out that other component parts may be responsible for the noise, remove the underfloor paneling first. If the noise complaints are NO LONGER present after removal, proceed with underfloor paneling rework. Underfloor paneling rework 1. Order after-sales kit with item number A2326207003 for the rework. 2. After receiving the after-sales kit (A2326207003), check the contents: 22 screws (A0109902604) / 14 rivet nuts (A0009902349) / 4 spacer washers (A2326207203). If the content is complete, start rework in the next step. 3. Disassemble underfloor paneling. If front and rear engine compartment lining are bonded to one another, order new parts (A2326201101, A2326268900). 4. Clean underfloor paneling and integral carrier
. 5. Mark four additional screw connection points on the front engine compartment lining (see attachment 1). See appendix 2 for dimensions. 6. Drill holes with d=9 mm on the markings. 7. Screw front and rear engine compartment lining together using the screw connection points already available (see attachment 3). Both linings are therefore aligned to one another. Important: Pay attention to alignment of the elongated holes on the external edges. 8. Drill into the rear engine compartment lining using the four additional holes with d=9 mm (see attachment 4). 9. Disassemble front and rear engine compartment lining. 10. Drill out three existing rivet nuts with d=9 mm (see attachment 5). 11. Insert seven new rivet nuts (A0009902349) (see attachment 6). 12. Drill out seven existing rivet nuts in the integral carrier with d=9 mm (see attachment 7). Caution: Do not damage integral carrier. 13. Remove remaining rivets that have fallen off from the integral carrier using a magnetic tube (see attachment 8). 14. Insert new rivet nuts (A0009902349) in the integral carrier (see attachment 9). 15. Fix four spacer rings (A2326207203) in place using bonding points between underfloor paneling and integral carrier (for position, see attachment 10 and attachment 11). Caution: No adhesive can be applied to the contact areas (risk of torque loss). 16. Install underfloor paneling on vehicle with 16 Nm (observe screw sequence in attachment 12). Important: Use screw item number A0109902604.
Model Series 192 or 232 - Cracking or Clicking Noise From Underbody
Topic number
LI61.20-P-077105
Version
4
Function group
61.20 - Lower engine compartment paneling
Date
5/22/25
Validity
Vehicles of model series 232 and 192 up to production
date 05.12.2024.
Reason for change
Testing method supplemented, after-sales kit available in
Replacement Parts, torque changed
Complaint
Cracking/clicking noise from underbody when driving slowly (around curves); see attachment.
Attachments
File
Description
Noise.MOV
Cause
Potential causes:
•
Assembly of the underfloor paneling with unloaded body (results in tension after compression of vehicle in K0design level)
•
Relative movement between front and rear engine compartment lining
•
Torque loss of the screw connection
•
Accumulation of stones and dirt
Remedy
•
•
•
•
Screw connection in K0-design level (vehicle sitting on ground on it's own weight) and taking into account the
correct screw sequence
Additional screw connection points (minimization of relative movement)
Increase in tightening torque
Integration of spacer rings (reduction of accumulation of stones and dirt)
In order to rule out that other component parts may be responsible for the noise, remove the underfloor paneling first.
If the noise complaints are NO LONGER present after removal, proceed with underfloor paneling rework.
Underfloor paneling rework
1.
2.
3.
4.
Order after-sales kit with item number A2326207003 for the rework.
After receiving the after-sales kit (A2326207003), check the contents: 22 screws (A0109902604) / 14 rivet nuts
(A0009902349) / 4 spacer washers (A2326207203). If the content is complete, start rework in the next step.
Disassemble underfloor paneling. If front and rear engine compartment lining are bonded to one another, order
new parts (A2326201101, A2326268900).
Clean underfloor paneling and integral carrier.
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© Copyright Mercedes-Benz AG
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Page 1 / 7
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Mark four additional screw connection points on the front engine compartment lining (see attachment 1). See appendix 2 for dimensions.
Drill holes with d=9 mm on the markings.
Screw front and rear engine compartment lining together using the screw connection points already available
(see attachment 3). Both linings are therefore aligned to one another. Important: Pay attention to alignment of
the elongated holes on the external edges.
Drill into the rear engine compartment lining using the four additional holes with d=9 mm (see attachment 4).
Disassemble front and rear engine compartment lining.
Drill out three existing rivet nuts with d=9 mm (see attachment 5).
Insert seven new rivet nuts (A0009902349) (see attachment 6).
Drill out seven existing rivet nuts in the integral carrier with d=9 mm (see attachment 7). Caution: Do not damage
integral carrier.
Remove remaining rivets that have fallen off from the integral carrier using a magnetic tube (see attachment 8).
Insert new rivet nuts (A0009902349) in the integral carrier (see attachment 9).
Fix four spacer rings (A2326207203) in place using bonding points between underfloor paneling and integral
carrier (for position, see attachment 10 and attachment 11). Caution: No adhesive can be applied to the contact
areas (risk of torque loss).
Install underfloor paneling on vehicle with 16 Nm (observe screw sequence in attachment 12). Important: Use
screw item number A0109902604.
Attachments
File
Description
Anhang 1.JPG
Attachment 1: Mark additional screw connection points on
the front engine compartment lining and drill with d=9 mm
Anhang 2.pdf
Attachment 2: Position/dimensions of the additional screw
connection points
Anhang 3.JPG
Attachment 3: Alignment of front and rear engine compartment lining to one another by means of existing screw
connection points
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Anhang 4.JPG
Attachment 4: Drill four additional holes with d=9 mm on
the rear engine compartment lining
Anhang 5.JPG
Attachment 5: Drill off three existing rivet nuts with d=9
mm
Anhang 6.JPG
Attachment 6: Insert new rivet nuts (A0009902349)
Anhang 7.JPG
Attachment 7: Drill off seven rivet nuts from integral carrier with d=9 mm
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Anhang 8.JPG
Attachment 8: Remove fallen off remaining rivets from integral carrier
Anhang 9.JPG
Attachment 9: Insert new rivet nuts (A0009902349)
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Anhang 10.JPG
Attachment 10: Fix spacer rings in place using bonding
points (front engine compartment lining)
Anhang 11.JPG
Attachment 11: Fix spacer rings in place using bondings
points (rear engine compartment lining)
Anhang 12.JPG
Attachment 12: Mount underfloor paneling on vehicle with
new screws (A0109902604), 16 Nm, and in correct screw
sequence
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WIS-References
Document number
Title
Note
AR61.20-P-1105SLY
Remove/install lower engine compart- ment lining
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
Body > Body/Cab > Body noises > Cracking/creaking
Body > Body/Cab > Body noises > Clattering
Parts
Part number
ES1 ES2 Designation
A2326207003
Quantity Note
Aftersales kit
EPC
1
X
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage
code
Note
Page 6 / 7
Rework with after-sales kit
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© Copyright Mercedes-Benz AG
6240736
CCUSHWA
Rework front + rear trim
Page 7 / 7
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TSB/Document ID: LI61.20-P-077105
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-22
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
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