Mercedes-Benz C-Class Service Bulletins (2023)

421 manufacturer communications on file.

• May 15, 2026•Document ID: 11032751

  Service Bulletin/Repair Instructions
  SUSPENSION; WHEELS

  Mfr Comm. #:

  LI40.10-P-061032

  Date Added:

  May 18, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Noises at the front axle when cornering or maneuvering (video files attached) Note: Save video files locally and play them with Windows Media Player. Cause Driving with summer tires in combination with low outside temperatures. At low outside temperatures or in wet conditions, a noise may be produced at the outer wheel on the front axle while maneuvering with sharp steering angles. Note: AMG vehicles with 4MATIC of model series 217 (without code 494) and model series 222 have a modified axle geometry compared with series production vehicles to provide more sporty handling. The problem cannot be remedied by changing the axle settings.

  Associated Products (165)

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  Associated Documents

  • DownloadMC-11032751-0001.pdf↗
• May 15, 2026•Document ID: 11032736

  Other
  SUSPENSION; POWER TRAIN

  Mfr Comm. #:

  PSL-NCU Return Parts 5/15

  Date Added:

  May 18, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  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, June 4, 2026. After June 4th, 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 (95)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz C-Class2024 Mercedes-Benz G-Class2024 Mercedes-Benz GLE-Class2024 Mercedes-Benz GLS-Class2024 Mercedes-Benz S-Class2024 Mercedes-Benz SL-Class2023 Mercedes-Benz AMG GT2023 Mercedes-Benz C-Class2023 Mercedes-Benz CLS-Class2023 Mercedes-Benz E-Class2023 Mercedes-Benz G-Class+ 75 more
  Associated Documents

  • DownloadMC-11032736-0001.pdf↗
• May 15, 2026•Document ID: 11032704

  Service Bulletin/Repair Instructions
  SEATS

  Mfr Comm. #:

  LI91.29-P-080554

  Date Added:

  May 15, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint One or more seat functions are restricted or inoperative. This may include: • Seat memory • Automatic seat adjustment • Easy Entry/Exit • Head restraint presetting • Collision avoidance with bench seat at rear • Actuation by other vehicle systems Seat normalization is missing, and fault code B228678 – “The control unit calibration has been lost or was not performed. Adaptation or adjustment is not correct.” is stored in the seat control unit. Additional fault codes may also be present. Cause The condition is currently under investigation. Remedy Process any additional faults first. • If a clear cause is found (for example, a failed component, wiring issue, or connector concern), repair that issue as required. If no root cause can be determined: • Do NOT perform Initial Start-up, Software Update, or Normalization of the Control Unit • Create a control unit log for the affected seat control unit. • Open a TIPS case to the Body/Chassis/Entertainment inboxand attach the control unit log for further analysis.

  Associated Products (21)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz S-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-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+ 1 more
  Associated Documents

  • DownloadMC-11032704-0001.pdf↗
• May 12, 2026•Document ID: 11032599

  Service Bulletin/Repair Instructions
  SUSPENSION

  Mfr Comm. #:

  LI33.20-P-078406

  Date Added:

  May 12, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. Sound file attached for comparison. MUST match noise for proper diagnosis. NOTE: Steering functionality is not affected. Cause Contact area between wheel bearing and steering knuckle. See also: LI35.30-P-058566 (Throttle Lift-Off Noise - Rear) LI33.30-P-056665 (Throttle Lift-Off Noise - Front) LI40.10-P-059248 (Wheel cracking noise when cornering) Remedy 1. Perform Operation A and evaluate by testing vehicle. 2. If noise is still present after re-testing: • If 192/232 chassis, verify FIN is in the listed range below in "Operation B" and perform. • If not 192/232 chassis or vehicle is a 192/232 not in the listed FIN range, additional verifications of where the noise is coming from are needed. Use multiple channel NVH method to narrow down location. Verify the LI's listed above were completed or if there are other similar noises associated with the chassis (Example: 192/232 also has under panel noises and an associated LI). Operation A: 1. Clean contact surfaces of wheel bearing and steering knuckle with brake cleaner (see areas marked blue in pictures "2.jpg" and "3.jpg"). NOTE: The front area of the wheel bearing and the seals must not come into contact with the cleaner, otherwise, the sealing rings will be damaged. 2. Clean threads of wheel bearing mounting. 3. Thinly coat contact surfaces of wheel bearing, steering knuckle, and axle mating face with Molykote (annular joint grease) (see areas marked blue in pictures "2.jpg" and "3.jpg"). NOTE: Axle mating face greasing is also covered in LI35.30-P-058566 and LI33.30-P-056665. Operation B (Only applies to 192 and 232 in listed FIN range): Only affects vehicles up to FIN end number: • Model series 192: xxx xxx xx 002 876 • Model series 232: xxx xxx xx 022 312 1. Replace steering knuckle. 2. Wheel bearings do not need to be replaced.

  Associated Products (98)

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  Associated Documents

  • DownloadMC-11032599-0001.pdf↗
• May 12, 2026•Document ID: 11032699

  Service Bulletin/Repair Instructions
  BACK OVER PREVENTION: WARNINGS; LANE DEPARTURE: BLIND SPOT DETECTION; ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.65-P-080132

  Date Added:

  May 14, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.

  Associated Products (117)

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  Associated Documents

  • DownloadMC-11032699-0001.pdf↗
• May 8, 2026•Document ID: 11032576

  Service Bulletin/Repair Instructions
  STEERING

  Mfr Comm. #:

  LI46.15-P-070510

  Date Added:

  May 11, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Cause At present, there are no known noise problems with the steering column. Remedy Check surrounding area of the steering column for possible noises. • Instrument panel support • Steering column switch module If noise only occurs when adjusting the steering column via electric actuation please perform: 1. Disassemble bellows of steering column tube module. 2. Move steering column entirely out and entirely down. 3. Grease steering column on green-marked positions with a suitable brush (find pictures in attachment). 4. Move column up 1/4 of the way and grease again. 5. Continue until upper limit stop is reached. 6. Then move steering column adjustment in all directions from limit stop to limit stop several times to work in the grease. 7. If noise does not resolve, perform above procedure again and anywhere there are movement or friction points that the noise seems to be emanating from. 8. Then move steering column adjustment in all directions from limit stop to limit stop several times to work in the grease. 9. If noise still does not resolve, please open a TIPS case. For all other noises or if the above does not resolve, create a TIPS case Body, Chassis, and Entertainment inbox. Attach a detailed description of the noise complaint, images, and a recording of the noise. A detailed description includes: • Position of height and longitudinal adjustment when the noise occurs • If possible, locate affected component part on steering column • State any change in the noise when steering column component parts are touched (e.g. spring, etc.)

  Associated Products (64)

  2027 Mercedes-Benz CLA-Class2026 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-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class+ 44 more
  Associated Documents

  • DownloadMC-11032576-0001.pdf↗
• May 5, 2026•Document ID: 11032361

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI27.60-P-076554

  Date Added:

  May 6, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint • Harsh 1-2, 2-3, and/or 3-4 shift • Jerky shifting • Jolting when accelerating from stop Cause Insufficient software application causing elevated K81/K27/B05 fill time adaptations and elevated torque adaptations for concerning shift. Note: Shift quality in E Performance models can be affected if the HV Battery state of charge (SOC) reaches 25% or below. Remedy Check VGS software level, and follow relevant remedy instructions. (see attachment) Vehicles with VGS software levels up to 22A: As of 4/18/2025, an aftersales software improvement has been released for model year 2023 C43 and SL43. This software has been implemented in production as of model year 2024, however this LI should still be followed if the concern is present. 232 - A0009025699 206 - A0009025599 Please ensure your Xentry machine is up to date with the latest Add Ons and continue with the following steps: Note: ALL steps must be performed to rectify concern 1. Perform software update all control units included in VGS software update. 2. Check transmission oil level and correct, if necessary (transmission oil temperature > 60 °C) 3. Perform Xentry Valve Flushing procedure at least 3x 4. Perform resetting of deceleration values (VGS > Special Procedures > Special procedure > Resetting learned values Deceleration mode) 5. Perform a standstill adaptation, then read out new EEPROM data 6. Perform driving adaptation(s) while adhering to the below parameters for at least 20-30 miles. Note: There is no menu in Xentry for this procedure. We recommend displaying the torque in the instrument cluster. If all below parameters are met at the time the shift, a driving adaptation will automatically occur. Harsh 1-2 Perform a driving adaptation of 4-5 (adapts K81 for the 1-2 shift) Harsh 2-3 Perform a driving adaptation of 6-7 (adapts B05 for the 2-3 shift) Harsh 3-4 Perform a driving adaptation of 3-4 (adapts K27 directly) - See attached PDF for min/max torque, and RPM parameters - Transmission oil temperature > 30°C (>86°F) - Level track (no incline/decline) - Slippery drive program - Display the torque in the instrument cluster - Constant engine torque - Do not shift via paddle If the vehicle returns and already had ALL steps in this LI performed on a previous visit, or has software level 23A and newer: Please submit a TIPS case to the Powertraininbox and ensure the following is included: - Initial Quick Test w/ Freeze Frame Data - VGS Control Unit Log - Initial EEPROM (before any adaptations or Xentry procedures were performed) - Detailed vehicle history of the complaint

  Associated Products (5)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz C-Class2024 Mercedes-Benz C-Class2023 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11032361-0001.pdf↗
• May 4, 2026•Document ID: 11032051

  Service Bulletin/Repair Instructions
  SEATS

  Mfr Comm. #:

  LI91.10-P-076097

  Date Added:

  May 4, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Play/noise at height adjuster or in seat guide rail on front seats Cause Tolerances and variations in the manufacturing process Remedy 1. Inspect Seat Height Adjuster Barcode Label (See Pic.1) • Locate the barcode label on the cross tube of the seat height adjuster. • In isolated cases, the barcode label may be located on the front side of the cross tube. If not visible, remove the seat cushion to access the label. 2. Evaluate Production Status If Production Status is LOWER than E108 → Replace the seat frame base with the height adjuster motor. If Production Status is E108 or HIGHER → Do NOT replace parts. Please submit a TIPS case to the Body/Chassis/Entertainment inbox and attach: • Video of the noise concern • Photo of the barcode label To improve analysis quality, ensure the video meets the following criteria: • Seat installed in the vehicle • Quiet workshop environment • Steady and smooth camera movement • Good lighting on the suspected noise area • Recording with two people (one filming, while the other is creating the noise-causing movement) • Noise‑causing movement must be clearly visible • Camera position: From the rear footwell, looking forward at the front seat • Verbal explanation included in English or German

  Associated Products (15)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2022 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11032051-0001.pdf↗
• April 28, 2026•Document ID: 11031698

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI07.10-P-080384

  Date Added:

  April 29, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Customer reports Check Engine Light with possible loss of power concern. The Following DTC's are present • P210185 - The throttle valve actuator has a malfunction. There is a signal above the permissible limit value. • P213500 - The values from the position sensors of the throttle valve are implausible relative to each other • P213600 - The values from position sensors "A/C" of the throttle valve are implausible relative to each other Cause Increased electrical resistance in pins for left and right throttle actuators. (M16/60 and M16/61) Remedy Replaced left and right throttle actuator Sockets with updated part. Silver Coated Pins 8x A 003 982 70 26 (according to wiring diagram 0,5mm) 4x A 003 982 75 26 (according to wiring diagram 0,75mm) ELA Seals 12x A 001 545 50 80

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  Associated Documents

  • DownloadMC-11031698-0001.pdf↗
• April 24, 2026•Document ID: 11031558

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI00.01-P-078887

  Date Added:

  April 25, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The intent of this document is to provide workshops with helpful technical reference language. • Commonly used acronyms in LI's and TIPS cases. • Control unit names, numbers, and how to identify. • Network/wiring architecture groups to baumuster quick reference. • Platform to baumuster quick reference. Cause Information only Remedy Acronyms: • AV = Actual Values • CPR = Car Package Release (For MB.OS) • CU = Control Unit • CUL = Control Unit Log • DTC = Diagnostic Trouble Code • E-Stand = Fresh-up head unit boot software (found in head unit control unit log) • FUP = Fresh-up • FW = Firmware • HSVL = High Speed Video Line • HU = Head Unit • HW = Hardware • IPD = Injector Performance Data • ISU = Initial Start Up • LVDS = Low Voltage Differential Signal • NAG"x" = New Automatic Gearbox ("x" is the generation number, example: NAG3) • NSFT = Not Safe For Transport • MOPF = Model Facelift (Ex: 167 MOPF) • PiH = Plug-in Hybrid • SA Code = Sonderausstattungscode (Option Code) • SCN = Software Calibration Number • SW = Software • TCU = Telecommunication Control Unit (Hermes/Ramses/Etc...) • QT = Quicktest • XD = XENTRY Diagnosis Control Unit Identification: Refer to the attachment "Control Unit Nomenclature" for location of each. • Control Unit Name • Control Unit Number • Control Unit Short name • Control Unit Diogenes ("dy-oj-uh-neez") name - Control unit variant/family. Network/Wiring Architecture to Baumuster Quick Reference: Star 1 • 117, 156, 246 (MFA) • 166, 176, 221, 242, 246, 292 • 906 Star 2 • 205, 213, 238, 253, 257, 290 (MRA) • 117, 156, 246 (MFA) • 118, 177, 243, 247 (MFA2) • 167, 222, 292, 463, 465 • 907 Star 3 • 294, 295, 296, 297 (EVA2) • 206, 214, 223, 236, 254 (MRA2) • 192 and 232 (MSA) Star 3.5 • 174 • 178 Platform to Baumuster Quick Reference: MRA = "Mercedes-Benz Rearwheel Architecture": • 205 • 213 • 222 • 238 • 253 • 257 • 290 MRA2 = "Mercedes-Benz Rearwheel Architecture - Generation 2": • 206 • 214 • 223 • 236 • 254 MFA = "Mercedes-Benz Frontwheel Architecture" • 117 • 156 • 246 MFA2 = "Mercedes-Benz Frontwheel Architecture - Generation 2" • 118 • 177 • 243 • 247 EVA1.5 = "Electric Vehicle Architecture" • 243 EVA2 = "Electric Vehicle Architecture - Generation 2" • 294 • 295 • 296 • 297 MSA = "Mercedes-Benz Sport Architecture" • 192 • 232 MMA = "Mercedes-Benz Modular Architecture" • 174 • 178

  Associated Products (109)

  2026 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 SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class+ 89 more
  Associated Documents

  • DownloadMC-11031558-0001.pdf↗
• April 21, 2026•Document ID: 11031581

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI20.10-P-072886

  Date Added:

  April 27, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint CEL ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and stored in the ME (N3/10). There are no drivability concerns related to the complaint. Cause Root cause varies Remedy Prior to performing any repairs for this complaint: With a cold engine, pressurize the high temp coolant circuit and while it's under pressure, release the cap on the low temp coolant circuit and check if the pressure drops right away or not. If the pressure drops, the lower hoses are swapped. Correct this, fill, bleed and test drive the vehicle. If the complaint returns, then continue with the steps below. IMPORTANT: Use VMI to check for emission extended warranty – Engine Thermostat (incl. software update) MY19-23, Various Models and Platforms (167, 190, 205, 213, 217, 222, 223, 232, 253, 290, 463) If the vehicle is covered under an emission extended warranty, Please perform steps outlined in the NCU for repairs. If vehicle is not covered under an emission extended warranty, then proceed as follows: Check for available software updates to the ME (N3/10). If updated software is available, perform the update, clear the DTC and the perform each of the "WARM START" and "COLD START" test drives listed below twice. If the code does not re-appear then release the vehicle If there is no new software available OR the DTC returns after the test drives then perform the following steps: • Drain the coolant through a fine mesh sieve and check for signs of debris. Additionally, inspect the coolant reservoir for debris. If any debris is found, flush the system several times to clear as much of the debris as possible • Replace the thermostat and bleed the system as outlined in AR20.00-P-1142-04A, evacuate the system for 20-30 minutes instead of the 5 minutes specified in step 22 • NOTE: Please use all the tools specified in the AR document • NOTE: There are two valid thermostats to choose from in the parts section of this LI. Please verify which PN is applicable for the vehicle being worked on via XENTRY Parts Information • After bleeding the system clear the DTC and perform each of the "WARM START" and "COLD START" test drives listed below twice. If the DTC does not reappear after the tests, release the vehicle If there is no new software available, the thermostat has already been replaced, and the DTC returns open a TIPS case and attach the following documents: • Initial quick test • ME (N3/10) control unit log • The results of an R48 test from a “yes” response and from a “no” response WARM START · Begin with the engine coolant temperature at approximately 50 degrees C · Activate the AC system, if defrost is not in use open the windows · Drive the car normally until a coolant temperature of 75 degrees C is achieved · Depress the accelerator pedal 50% for ~5 seconds (partial acceleration) · Let off the accelerator pedal and let the car coast for ~10 seconds · Continue to drive the car normally COLD START · Drive for ~7 miles (normal driving) · Shut off the engine in a parking lot (or similar), wait 30 seconds, then restart and continue driving · Depress the accelerator pedal 50% for ~5 seconds (partial acceleration) · Let off the accelerator pedal and let the car coast for ~10 seconds · Continue to drive the car normally

  Associated Products (69)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz G-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz GLE-Class2024 Mercedes-Benz GLS-Class2024 Mercedes-Benz S-Class2024 Mercedes-Benz SL-Class2023 Mercedes-Benz AMG GT2023 Mercedes-Benz C-Class2023 Mercedes-Benz E-Class2023 Mercedes-Benz G-Class2023 Mercedes-Benz GLC-Class+ 49 more
  Associated Documents

  • DownloadMC-11031581-0001.pdf↗
• April 17, 2026•Document ID: 11031367

  Service Bulletin/Repair Instructions
  SUSPENSION

  Mfr Comm. #:

  LI33.20-P-078406

  Date Added:

  April 17, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. Sound file attached for comparison. MUST match noise for proper diagnosis. NOTE: Steering functionality is not affected. Cause Contact area between wheel bearing and steering knuckle. See also: LI35.30-P-058566 (Axle Half Shaft noise when changing direction - Front) LI33.30-P-056665 (Axle Half Shaft noise when changing direction - Rear) LI40.10-P-059248 (Wheel cracking noise when cornering) Remedy 1. Perform Operation A and evaluate by testing vehicle. 2. If noise is still present after re-testing: • If 192/232 chassis, verify FIN is in the listed range below in "Operation B" and perform. • If not 192/232 chassis or vehicle is a 192/232 not in the listed FIN range, additional verifications of where the noise is coming from are needed. Use multiple channel NVH method to narrow down location. Verify the LI's listed above were completed or if there are other similar noises associated with the chassis (Example: 192/232 also has under panel noises and an associated LI). Operation A: 1. Clean contact surfaces of wheel bearing and steering knuckle with brake cleaner (see areas marked blue in pictures "2.jpg" and "3.jpg"). NOTE: The front area of the wheel bearing and the seals must not come into contact with the cleaner, otherwise, the sealing rings will be damaged. 2. Clean threads of wheel bearing mounting. 3. Thinly coat contact surfaces of wheel bearing, steering knuckle, and axle mating face with Molykote (annular joint grease) (see areas marked blue in pictures "2.jpg" and "3.jpg"). NOTE: Axle mating face greasing is also covered in LI35.30-P-058566 and LI33.30-P-056665. Operation B (Only applies to 192 and 232 in listed FIN range): Only affects vehicles up to FIN end number: • Model series 192: xxx xxx xx 002 876 • Model series 232: xxx xxx xx 022 312 1. Replace steering knuckle. 2. Wheel bearings do not need to be replaced.

  Associated Products (72)

  2026 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 SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz C-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz GLE-Class+ 52 more
  Associated Documents

  • DownloadMC-11031367-0001.pdf↗
• April 16, 2026•Document ID: 11031580

  Service Bulletin/Repair Instructions
  EXTERIOR LIGHTING

  Mfr Comm. #:

  LI82.10-P-078301

  Date Added:

  April 27, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Headlamp, front fog lamp leaky or fogged. Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1. Drive vehicle into workshop (temperature higher than +18 °C/+64.4 °F) and connect the exhaust extraction. Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the hood. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing of fogged/condensed LED headlamps and LED rear lamps on electric vehicles: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). 2. Connect battery backup via a charger. 3. Open the front-end flap and ensure sufficient ventilation. 4. Switch on the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Clearing fogged/condensed halogen/xenon headlamps: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4°F). Note: Do not perform an engine wash before the defogging test. 2. Switch off the engine. 3. Open the hood. 4. Switch off the lights. 5. Leave the vehicle in this state for 60 minutes. 6. Check for formation of condensation, a significant reduction in the formation of condensation must be clearly recognizable (thawing progress). Note: If there is no visible reduction in condensation, check the headlamp for malfunctions. (see Remedy 2) It is not physically possible to defog the headlamps completely. Fogging does not impair the operation or the service life of the headlamp. Note: Only implement Remedy 1 for model series 463 (from model year 2018) and model series 465. Remedy 2 A defective headlamp can be identified as follows: 1. Check the headlamp for external damage and that the cover caps and the diaphragm are correctly seated. 2. Check the electrical connectors of the plugs and pins. 3. Check for leak tightness according to LI82.10-P-078307. The test can only be conducted on headlamps. 4. If the headlamp or the rear lamp has any external damage, replace the component part in accordance with the WIS instructions. Note: External damage to the headlamp/rear lamp or faulty seating of the cover caps does not present a warranty or goodwill case. Note: With headlamps, it is possible to install desiccant packs if the problem occurs repeatedly. • Open ventilation system LI82.10-P-078302 • Closed ventilation system LI82.10-P-078304

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  Associated Documents

  • DownloadMC-11031580-0001.pdf↗
• April 13, 2026•Document ID: 11031272

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.70-P-080411

  Date Added:

  April 13, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint No heating output is available during electric driving operation. In conventional (combustion engine) driving operation, full heating output is available. Cause Possible defect in the N33/5 water heater (high-voltage PTC booster heater) Remedy If the N33/5 water heater (PTC booster heater, high voltage) is defective, it must be replaced with the latest part number. Note: Please refer to the information in XENTRY Parts Information and the latest WIS description. For vehicles manufactured before December 2025 with a BorgWarner water heater, the coolant hoses (inlet and outlet) must also be ordered and installed. For vehicles produced after December 2025, only the N33/5 water heater (PTC booster heater high voltage) needs to be replaced. Follow instructions in XPPI C74 note for the correct parts.

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  Associated Documents

  • DownloadMC-11031272-0001.pdf↗
• April 8, 2026•Document ID: 11031201

  Service Bulletin/Repair Instructions
  AIR BAGS

  Mfr Comm. #:

  LI91.60-P-076303

  Date Added:

  April 8, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint SRS indicator light illuminated in the instrument cluster. Electrical fault in the rear airbag/window airbag that may cause a connection between the airbag pins or to the vehicle mass Cause Contact problems that create a short circuit between the pins or to the vehicle ground Remedy Connect and disconnect the affected airbag five times Then the squib must be carefully blown out with dry compressed air. Caution: There must be no mechanical contact! If fault is not rectified: Please measure the internal resistance as described in SI91.00-P-0005A. If the resistor of the airbag is OK, please replace the airbag plug. If the resistance of the airbag is not OK, please replace the airbag. Important: The electrical fault does not affect the functionality of the airbag in the event of an accident. The airbag is functioning as intended.

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  Associated Documents

  • DownloadMC-11031201-0001.pdf↗
• April 8, 2026•Document ID: 11031198

  Service Bulletin/Repair Instructions
  EXTERIOR LIGHTING

  Mfr Comm. #:

  LI82.20-P-080425

  Date Added:

  April 8, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Optical irregularity in the light guide of the ambient lighting. Cause Exposure to external factors, e.g. cleaning or disinfecting agents, creams, mechanical stress, or impacts. Remedy The assessment of the complaint must be carried out from the normal seat position. Turn on ambient lighting and set to maximum brightness. The vehicle must be inside the workshop; the interior must not be exposed to any direct light (e.g., sunlight or strong interior lighting). If neither function nor lighting pattern of the ambient lighting is impaired, no warranty or goodwill claim is to be submitted.

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  Associated Documents

  • DownloadMC-11031198-0001.pdf↗
• April 7, 2026•Document ID: 11031202

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; VISIBILITY/WIPER

  Mfr Comm. #:

  LI72.40-P-071889

  Date Added:

  April 8, 2026

  Manufacturer:

  MERCEDES-MAYBACH

  Summary

  Complaint When closing the door, the side window may remain slightly open (short stroke position). Automatic window raising function of side window inoperative. NOTE: Window is fully operational while holding the switch Cause Software in door control unit (N69/x). Starting the engine at the same time as the door is closing (short stroke closure of window lifter) may result in a denormalization of the window lifter system. Remedy Update the software in the affected door control unit (N69/x). • This requires the door control unit (N69/x) to be commissioned. • (Path: XENTRY Scope; Control units view; DCU-XX (N69/x); Adaptations; Commissioning) Availability of the repair software in the field organization: • Since 10.10.2020 for model series 238, 257, 217 (FACELIFT) and A/C205 (FACELIFT) • Since 12.04.2021 for model series 118

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  Associated Documents

  • DownloadMC-11031202-0001.pdf↗
• April 2, 2026•Document ID: 11031256

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; STRUCTURE:BODY

  Mfr Comm. #:

  LI72.20-P-075746

  Date Added:

  April 10, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Tailgate opens unintentionally. Cause Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. EXAMPLE: when stored in trouser pocket, handbag etc. Remedy As of the 6th generation, the vehicle key can be recoded so that the tailgate no longer opens as a result of a long press on the button, but by double-clicking on the button instead. This reduces the likelihood of the button being activated accidentally or unintentionally. The recoding can be carried out as follows: 1. Add SA Code O19 into VeDoc (O for Oscar, not "zero") • an XSS ticket may be necessary to add the SA code 2. Perform SCN coding of EIS N73 control unit 3. Deactivate the vehicle key (a successful deactivation is indicated by the LED lighting up 2x briefly and then 1x for a long period). 4. Place the vehicle key in the storage compartment on the key symbol and turn on the ignition. IMPORTANT: all other vehicle keys must be outside the recognition range of the vehicle when doing this! Perform steps 3 and 4 successively for all vehicle keys. Notes: 6th, 7th and 8th generation keys can be deactivated as follows: Up to modification year 22/1 by double clicking the "Lock button" As of modification year 22/1, by press and holding the “Lock button", then double‑click the “Unlock button" at the same time. On model series 167, the storage compartment with the key symbol is located in the armrest. The SCN coding from the EZS is only transferred correctly to the vehicle key under the following conditions: Only one vehicle key is located in the vehicle, this key has been deactivated and it is positioned on the marking in the storage compartment for the data transfer. The costs for this adaptation are to be borne by the customer.

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  Associated Documents

  • DownloadMC-11031256-0001.pdf↗
• April 2, 2026•Document ID: 11031255

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.71-P-079104

  Date Added:

  April 10, 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 No TIPS case is necessary. Do not replace parts. A new software for the head unit is scheduled for tentative release in Q2 2026.

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  Associated Documents

  • DownloadMC-11031255-0001.pdf↗
• April 2, 2026•Document ID: 11031218

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.60-P-080383

  Date Added:

  April 10, 2026

  Manufacturer:

  MERCEDES-MAYBACH

  Summary

  Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of updating to the new one. Cause When a new station change request is triggered, a temporary glitch is causing the Head Unit application to fail to overwrite the previous request. This glitch is causing the cover art mismatch in the Radio application. Remedy Please do not replace any parts. The robustness measure has been identified and is planned for implementation in the A26/17 E505.9 software. The E505.9 software is expected to be available in XENTRY Q3 2026.

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  Associated Documents

  • DownloadMC-11031218-0001.pdf↗