Mercedes-Benz S-Class Service Bulletins (2027)

13 manufacturer communications on file.

• September 26, 2026•Document ID: 11038188

  Service Bulletin/Repair Instructions
  STEERING

  Mfr Comm. #:

  LI46.10-P-080896

  Date Added:

  October 6, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Slight creaking noises when steering. Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the horn contact plate and check the sleeves for noise; see attached video. If necessary, apply lubricant to the sleeves.

  Associated Products (91)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz CLE2027 Mercedes-Benz E-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT+ 71 more
  Associated Documents

  • DownloadMC-11038188-0001.pdf↗
• September 25, 2026•Document ID: 11037484

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.90-P-080935

  Date Added:

  September 25, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint CEL illuminates and/or AC does not blow cold. Cause Potentially relevance to hardware and/or software Remedy Scenario 1: 1. If the AC does not blow cold air, replace compressor (if compressor's index and part number Figure 1 match against Table 1). a. If the compressor does not fall within Table 1, please open a TIPS case. b. Flush procedure must be followed as per WIS. Scenario 2: 1. If AC does blow cold. a. Follow the following procedure: i. Have the air conditioning system recharged. ii. Clear the fault codes afterward. iii. Let the vehicle stand for 8 hours (OBD reset condition). iv. Check whether the fault is still present. b. Open TIPS case with your findings and answers the following questions, send to the HV/LV inbox. i. When exactly did the MIL appeared (immediately at start‑up or while driving). ii. What was the ambient temperature, any special driving maneuvers, and whether the vehicle had just come out of a climate‑controlled garage.

  Associated Products (22)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz S-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz C-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2023 Mercedes-Benz S-Class2022 Mercedes-Benz C-Class2022 Mercedes-Benz S-Class+ 2 more
  Associated Documents

  • DownloadMC-11037484-0001.pdf↗
• September 22, 2026•Document ID: 11038186

  Service Bulletin/Repair Instructions
  SERVICE BRAKES

  Mfr Comm. #:

  LI42.10-P-078779

  Date Added:

  October 6, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. Cause Although the cause of the vibration is most likely due to excessive lateral runout on the rotor or hub/wheel bearing, the system as a whole needs to be checked for other possible contributors. 1. Prior collision damage. 2. Excessive vehicle sitting times without rotating components. 3. Wheel bearing/hub lateral runout. 4. Wheel mating interface has been overtightened (did not follow WIS torque procedures). 5. Mating interfaces have been excessively modified (painted, gouged, bent, etc...). Remedy Read through the entire attached worksheet prior to performing. After performing, please review the final page and perform work accordingly. NOTE: This document is not pre‑authorization or otherwise dealing with warranty. This is intended for diagnostic purposes only. If there are any questions on how to proceed OR The work sheet has been performed and the vehicle has returned with the same concern. Please perform the measurements as seen in the worksheet again and open a TIPS case to the Body, Chassis, and Entertainment team.

  Associated Products (296)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz CLA-Class2027 Mercedes-Benz CLE2027 Mercedes-Benz E-Class2027 Mercedes-Benz G-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz G-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class+ 276 more
  Associated Documents

  • DownloadMC-11038186-0001.pdf↗
• September 18, 2026•Document ID: 11037379

  Other
  POWER TRAIN; STRUCTURE:BODY; VISIBILITY/WIPER; SUSPENSION

  Mfr Comm. #:

  PSL-NCU Return Parts 9/18

  Date Added:

  September 18, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Dear Dealer Partners, The part numbers listed in the chart below should no longer be installed and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is Thursday, October 8th, 2026. After October 8th, we will no longer accept returns of these parts. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. We will replace all returned parts in accordance with the chart below.

  Associated Products (14)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz S-Class2026 Mercedes-Benz C-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLS-Class2023 Mercedes-Benz S-Class2022 Mercedes-Benz C-Class2022 Mercedes-Benz S-Class2021 Mercedes-Benz S-Class
  Associated Documents

  • DownloadMC-11037379-0001.pdf↗
• September 17, 2026•Document ID: 11038176

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI20.10-P-075374

  Date Added:

  October 6, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Red coolant warning in instrument cluster. Fault codes U019F00 or U019F87 current/stored in MRG1 control unit. Cause Various causes Remedy Perform guided test for fault code U019F with XENTRY diagnosis. Verify the following connections are clean and tight. Correct any problems and retest pump actuation: ‑12V plug at M75/11 ‑48V plug at M75/11 ‑48V connector X192/4 ‑Connections at 48V fuse box F153/2 ‑Sockets 1,2, and 5 at connector 2 of MRG1 control unit ‑M75/11 circuit 41 ground If actuation and above connections are OK, but resistance between M75/11 and engine block is less than 2 ohms or heat shield touching coolant pump, proceed with below steps. 1‑Modify engine insulation per attached instructions. 2‑Remove engine control module and measure continuity within control unit between connector 2 pin 1 and connector 6 pin 2. 2a‑If open circuit is found, replace engine control unit (MRG1) and perform initial startup. Refer to XENTRY parts information group 54/054 item 300. 3‑Clear faults and verify M75/11 operating normally.

  Associated Products (44)

  2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz GLE-Class2024 Mercedes-Benz GLS-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz AMG GT2023 Mercedes-Benz CLS-Class2023 Mercedes-Benz E-Class2023 Mercedes-Benz GLE-Class2023 Mercedes-Benz GLS-Class2023 Mercedes-Benz S-Class+ 24 more
  Associated Documents

  • DownloadMC-11038176-0001.pdf↗
• September 17, 2026•Document ID: 11038175

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.30-P-080963

  Date Added:

  October 6, 2026

  Manufacturer:

  MERCEDES BENZ

  Summary

  Complaint Issue after OTA Update IC Odometer Reading blank("_ _ _ _") IC Maintanence data unavailable Cause OTA Update E61.0 Remedy In the IC Control Unit Log, please check the following information: Verify whether DTCs B228229, B228287, and B226656 are present in either A or A+S. Verify that Status Schlüssel‑ID = "ID is not valid" and Anlernstatus = "IC is initialized", as shown in the attached image (image_2). Please run the XENTRY guided test for the listed DTCs and provide the results.

  Associated Products (24)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz C-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz S-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz S-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz S-Class2024 Mercedes-Benz SL-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2023 Mercedes-Benz S-Class2023 Mercedes-Benz SL-Class+ 4 more
  Associated Documents

  • DownloadMC-11038175-0001.pdf↗
• September 14, 2026•Document ID: 11038217

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY

  Mfr Comm. #:

  LI82.62-P-078631

  Date Added:

  October 6, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary, create a TIPS case with an informative video as an attachment. Note: Please refer to this document in the warranty claim and, once diagnosis is completed, select the damage code depending on the component part that is causing the issue. • If the noise stops when the door trim is removed, please proceed in accordance with LI72.10‑P‑067691. Information: In this case, do not use a damage code for the speakers in the warranty claim!

  Associated Products (296)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz CLA-Class2027 Mercedes-Benz CLE2027 Mercedes-Benz E-Class2027 Mercedes-Benz G-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz G-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class+ 276 more
  Associated Documents

  • DownloadMC-11038217-0001.pdf↗
• September 14, 2026•Document ID: 11037834

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI35.31-P-080353

  Date Added:

  October 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Whining / humming noises (described as foghorn‑like) from the drivetrain in the rear axle area during cornering. (figure 1) On the above‑mentioned vehicles with a mileage up to 15,000 km (about 9,300 mi), noises can occur from the rear axle differential. Cause Drivetrain resonance caused by the gear mesh of the ring and pinion in the rear axle differential in combination with installed damper elements on the axle shafts. Remedy For precise noise analysis and localization, use the chassis ear/NVH kit and the following driving procedure: 1. Drive the vehicle in a tight circle with the steering at full lock in both clockwise and counter clockwise directions. ‑ Vary engine load during the maneuvers If a foghorn‑like noise occurs comparable to the reference video, the vehicle exhibits the condition If the noise is present: 1. Add 15 ml of additive (Friction Modifier) into the rear axle differential via the filler plug IMPORTANT NOTE: Do NOT use Friction Modifier in vehicles equipped with an electronically controlled locking differential (Code 467). 2. Tighten the filler plug 3. Drive the vehicle until the rear axle differential reaches operating temperature Note: Proper activation of the additive requires elevated oil temperatures After the test drive to operating temperature, evaluate the noise when the rear axle is cold and when warm. If the noise is no longer present: The issue is resolved and the vehicle can be released. If there is noticeable improvement: The vehicle can be released with the explanation that the noise will gradually disappear over an extended driving distance. If the noise is still present and remains unchanged: Replace the rear axle differential.

  Associated Products (41)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz CLE2027 Mercedes-Benz E-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class+ 21 more
  Associated Documents

  • DownloadMC-11037834-0001.pdf↗
• September 11, 2026•Document ID: 11037806

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.71-P-079104

  Date Added:

  October 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("‑ ‑"). • Flashing when current vehicle speed is under speed limit. • Flashing between US speed limit symbol and European speed limit symbol. NOTE: • Verify that the concern falls under one of the attachment videos. If not, then it is outside of the scope of this LI. • This also does not cover "Traffic Sign Inoperative" messages on the instrument cluster. Cause There are two identified reasons for this concern: 1. Country code information stored incorrectly at a particular geographic latitude range. 2. Incorrect reference data when the vehicle is started and a GPS signal is not immediately available. Remedy Update head unit software to latest version and the re‑check function in the same location. NOTE: Updated head unit software for AMG's has NOT been released yet. ETA 12/2026. If vehicle is still exhibiting one of the symptoms as described exactly as in the complaint section or as shown in the video attachments, open a TIPS case to the Body/Chassis/Entertainment inbox with the following: • Video of the concern. • Exact location (latitude and longitude is best)

  Associated Products (50)

  2027 Mercedes-Benz C-Class2027 Mercedes-Benz CLE2027 Mercedes-Benz E-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class+ 30 more
  Associated Documents

  • DownloadMC-11037806-0001.pdf↗
• September 5, 2026•Document ID: 11037281

  Other
  STRUCTURE:BODY

  Mfr Comm. #:

  PSL-NCU Return Parts 9/04

  Date Added:

  September 11, 2026

  Manufacturer:

  MERCEDES-MAYBACH

  Summary

  Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than Thursday, September 24th, 2026. After September 17th, returns of these parts will no longer be accepted. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. All returned parts will be replaced in accordance with the chart provided below.

  Associated Products (7)

  2027 Mercedes-Benz S-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz S-Class2022 Mercedes-Benz S-Class2021 Mercedes-Benz S-Class
  Associated Documents

  • DownloadMC-11037281-0001.pdf↗
• September 1, 2026•Document ID: 11037243

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.55-P-080937

  Date Added:

  September 9, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Cause Internal failure of the scroll wheel within the AC compressor. Remedy Check the compressor's index and part number Figure 1 against Table 1. If listed please perform the following: 1. Replace the compressor, drier, and expansion valve using the applicable WIS instructions. 2. Flush the system using the applicable WIS instructions.

  Associated Products (34)

  2027 Mercedes-Benz E-Class2027 Mercedes-Benz G-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz GLE-Class2027 Mercedes-Benz S-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz G-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz GLE-Class+ 14 more
  Associated Documents

  • DownloadMC-11037243-0001.pdf↗
• August 28, 2026•Document ID: 11037228

  Service Bulletin/Repair Instructions
  STEERING

  Mfr Comm. #:

  LI46.35-P-067339

  Date Added:

  September 9, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time. OR Rattling, humming, dry sliding/gravel noise from the electric steering system when steering (see attachment). Complaint does not impact the ability to safely steer or control the vehicle. Cause Ball screw drive (KGT) of electric steering damaged by: 1. External force due to: ‑ Hitting the curb/posts with the front wheels. ‑ Driving over obstacles (e.g. pothole/ threshold/ speed bump/ gully) at an inappropriate speed. 2. Corrosion/ water ingress through a damaged boot (see attachment). ‑ Cracks (1) ‑ High pressure cleaner (2) ‑ Animal bite (3) See various examples listed in the attachments for examples of outside influence. Remedy Remove boot clamps closest to steering gear housing on both left and right (as seen in "Steering Rack Boot Clamp Location"). Pull back boot and inspect for rust, broken end stops, water, or any other anomalies. Replace electric steering. Note: Steering gears replaced due to outside influence or damage must not be claimed under warranty!

  Associated Products (123)

  2027 Mercedes-Benz E-Class2027 Mercedes-Benz GLC-Class2027 Mercedes-Benz S-Class2027 Mercedes-Benz SL-Class2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz S-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class+ 103 more
  Associated Documents

  • DownloadMC-11037228-0001.pdf↗
• August 15, 2026•Document ID: 11037099

  Service Campaign
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  NCU - 2026080001

  Date Added:

  September 5, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year 2027 S-Class (223 platform) vehicles, the software for the 12 V on-board electrical system safety disconnect switch control unit does not correspond to the current series configuration. It is possible that during a workshop visit, the use of an undersized charger could result in undervoltage. If the vehicle detects undervoltage three times in succession, the safety disconnect switch will be permanently locked and prevents the vehicle from starting. Remedy MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the software of the Safety Disconnect Switch for the 12 V On-board electrical system.

  Associated Products (1)

  2027 Mercedes-Benz S-Class
  Associated Documents

  • DownloadMC-11037099-0001.pdf↗