News Channel Update |

Vehicle Compliance & Analysis

TO: Mercedes-Benz Dealer Principals, General Managers, FROM: Gregory Gunther, Department Manager, Vehicle
Sales Managers, Service Managers, Parts Managers
Compliance and Analysis, Engineering Services
RE: Service Campaign Launch Notification
Check Front Diffuser Attachment Point Seal
DATE: April 28, 2023
MY21 GT Black Series (190 platform)

IMPORTANT SERVICE CAMPAIGN LAUNCH

Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FORMERCEDES (1-800-367-6372).

Sincerely,
Gregory Gunther
Department Manager, Vehicle Compliance & Analysis

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

News Channel Update |

Vehicle Compliance & Analysis

Service Campaign Launch Notification
Campaign No. :

Campaign Desc. :

2023030016

22P8891008

April 28, 2023

Check Front Diffuser Attachment Point Seal

This is to notify you of the Service Campaign Launch to check the front diffuser on 379 Model Year (“MY”) 2021 GT Black Series
(190 platform) vehicles. The vehicles will be visible and flagged in VMI as “OPEN” on April 28, 2023.

Background
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has
determined that on certain MY 2021 GT (190 platform) vehicles, the front diffuser
may not meet current production specifications.

Issue

What We’re Doing

MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealership
will check the front diffuser attachment point seals and replace or repair as
necessary.

Parts

The remedy is available and can be performed as necessary.

Vehicles Affected
2021
GT Black Series

Vehicle Model Year(s)
Vehicle Model

Vehicle Populations
Total Campaign Population

379

Next Steps/Notes
AOMS/SOMS

AOMs – This campaign may generate questions from your dealers.

While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and customer
satisfaction. Please refer all customer inquiries to the Customer Assistance Center at 1-800-FOR-MERCEDES.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

2

Campaign No. 2023030016, April 2023
Revision B: 5/20/2024

TO:

ALL MERCEDES-BENZ CENTERS

SUBJECT:

Model GT (190 platform)
Model Year 2021
Check Front Diffuser Attachment Point Seal

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain
MY 2021 GT (190 platform) vehicles, the front diffuser may not meet current production
specifications. An authorized Mercedes-Benz dealership will check the front diffuser attachment
point seals and replace or repair as necessary.

Prior to performing this Campaign:


VMI must be checked before performing campaigns to verify that the campaign is required on
a specific vehicle. Always check for any other open campaigns and perform accordingly.



Please review the entire Campaign bulletin and follow the repair procedure exactly as
described.

Approximately 379 vehicles are affected.
Order No. P-SC-2023030016

2
Check front diffuser, replace or seal if necessary
Modification notes:
 Reference WIS document for Check/Test Procedure A changed.
 Code M032 corresponds to the BLACK SERIES VERSION.
Check/test procedure A
1. Remove lower front diffuser (A, Figure 1).
For basic data, see AR61.20-P-1105RGB.

A
Figure 1

2. Clean 5 threaded connection points (Figure 2) of removed front diffuser with isopropanol and check for corrosion.

Figure 2

P-SC-2023030016

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Figure 3, not OK
Figure 3 → Metal inserts are corroded (not OK)

Figure 4, OK
Figure 4 → Metal inserts are not/slightly corroded at edge (OK)
a. Metal inserts are severely corroded (Figure 3): Perform Work Procedure A.
b. Metal inserts are not and/or only slightly corroded at the edge (Figure 4): Perform Check/Test Procedure B
A reworking of the front diffuser shall be preferred!
The front diffuser is solely approved with informative images directly via a TIPS case by the Product Support
AMG / AMG Aftersales Regulation TEV/OPT.

P-SC-2023030016

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Check/Test Procedure B

1. Check the removed front diffuser to see whether all 16 (blue aramid pads) are affixed to the marked locations (Figure 5).

Figure 5
a. All 16 (aramid pads) are present (Figure 5): Carry out Work Procedure B.
b. All 16 (aramid pads) are not present (Figures 11 and 12):
Perform Work Procedures B and C.

P-SC-2023030016

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Work Procedure A
1. Remove clips and plastic protective strip in order to release the sealing lip (B, Figure 6).

B

Figure 6
2. Unclip cables on right and left (Figure 7).

Figure 7

P-SC-2023030016

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3. Remove screws for front diffuser lip, retaining straps and diffuser guide (Figure 8).
Fillister head screws to front diffuser 6 Nm

Figure 8
4. Disassemble both spring elements (Figure 9).

Figure 9

P-SC-2023030016

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5. Disassemble both diffuser guides (Figure 10).

Figure 10
6. Carefully pull apart front diffuser upper and lower parts (Figure 11).

Figure 11
7. Reassemble new part in reverse order.
8. Reinstall front diffuser.
For basic data, see AR61.20-P-1105RG.

P-SC-2023030016

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Work Procedure B
1. Clean all 5 attachment points (Figure 2) of front diffuser with isopropanol and allow to dry (Figure 12)

Figure 12
2. Fill all 5 attachment points around the decoupling disks with Teroson bead (Figures 13 and 14).

Figure 13

Figure 14

3. Spread/remove Teroson bead to/from surface of decoupling disk (Figure 15).
Teroson bead may not protrude by more than 1.5 mm beyond the disk.
Ensure there is no Teroson on the screw-on surface, clean if necessary.
Allow Teroson to cure according to the specification.

P-SC-2023030016

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Figure 15
4. Reinstall front diffuser.
For basic data, see AR61.20-P-1105RG.
5. Assemble in reverse order.

P-SC-2023030016

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Work procedure C
1. Clean 16 marked attachment points (Figure 16) of front diffuser with isopropanol and allow to dry (Figure 17)

Figure 16

Figure 17
2. Affix the self-adhesive aramid pads as centrally as possible on all 16 dried attachment points and press on all round
with your thumb (Figure 18 and 19).

Figure 18

Figure 19

3. Assemble in reverse order.
P-SC-2023030016

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Primary Parts Information
Qty.

As required*
As required
As required**
As required**

Part Name

Front diffuser upper part
LU adhesive sealing disk (aramid pads)
Teroson
Isopropanol

Part Number

A 190 520 24 00
A 190 989 00 00
A 000 989 46 06
A 005 989 19 71

* The replacement parts must be determined according to the equipment variant for the vehicle identification number via
the parts process in the Xentry Portal.
** 1 packaging unit must be used for approx. 10 vehicles and has to be claimed as quantity 0.1
Small parts such as screws, lock nuts, sealing rings, cable ties, fluids, sealant, etc. are not listed in the parts list. The
required small parts are taken into account in the budgeting.
__________________________________________________________________________________________________
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Warranty Information
Damage

Operation

Code

Number

02-0248
02-0249
88 910 08

02-0250

02-0251

02-2186

Description

Check front diffuser
Check/Test Procedures A and B
Includes: Remove front diffuser, clean with isopropanol and check for
corrosion, as well as check all 16 pieces (blue aramid pads)
Partially replace front diffuser (after check)
Work Procedure A
Seal front diffuser (after check) Work Procedure B
All 16 aramid pads are present
Includes: Clean 5 attachment points on front diffuser and seal with Teroson
Rework front diffuser (after check)
Work Procedures B and C
All 16 aramid pads are not present
Includes: Clean 5 attachment points on front diffuser and seal with Teroson,
and clean 16 attachment points on front diffuser and install aramid pads
Create TIPS case

Labor Time
(hrs.)

0.6
0.9
0.2

0.9

0.2

Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change
and updates may not be reflected in this document.

P-SC-2023030016