Mercedes-Benz C-Class Service Bulletins

930 manufacturer communications on file.

• November 20, 2024•Document ID: 11010755

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.85-P-078473

  Date Added:

  November 23, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint After a control unit replacement of "N112/9 - control unit for telematics services (HERMES)" or the "N112/2 - control unit for telematics services (RAMSES)", the Digital Extras (previously Mercedes me) cannot be activated. The DTC B15CE00 is active or active+saved. In vehicles with "N112/9 - control unit for telematics services (HERMES)": • The message "SOS - service not activated" permanently lights up in the instrument cluster AND the actual value "Error when replacing certificate (CEP.36)" is displayed in the actual values for the activation status under "Registration status" (see picture 1). • In the control unit log of the "N112/9 - control unit for telematics services (HERMES)", the registration error "CEP Invalid VIN/UniqueID combination" is displayed. In vehicles with "N112/2 - control unit for telematics services (RAMSES)": • The actual value "Error when replacing certificate (CEP.36)" is displayed in the actual values for the activation status under "Registration status" (see picture 1). • In the control unit log of the "N112/2 - control unit for telematics services (RAMSES)", the registration error "CEP_ VIN_UNIQUEID_INVALID" is displayed. The emergency call is not impaired. Cause In the event of a control unit replacement, sporadic problems in the back end could result in data from the new control unit not being updated in the back end system. Remedy Please create a TIPS case. In some cases, the problem rectifies itself on its own after a little while.

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  Associated Documents

  • DownloadMC-11010755-0001.pdf↗
• November 13, 2024•Document ID: 11010648

  Service Bulletin/Repair Instructions
  EXTERIOR LIGHTING

  Mfr Comm. #:

  LI82.10-P-078107

  Date Added:

  November 19, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint • Transfer of selected user-defined scene/ animation (Mercedes-Benz Phone App) from HU to ECU software fails to start. • Charging bar stops at 0%. (Picture in attachment) Cause Communication between headlight control unit and HU. Remedy Update the software of the following control units to the latest version: - A26/17 - MBUX multimedia system (head unit) - E1n14 - Front left digital headlight control unit (DHLS-CU-VL) - E2n14 - Front right digital headlight control unit (DHLS-CU-VR)

  Associated Products (4)

  2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2022 Mercedes-Benz C-Class2022 Mercedes-Benz GLC-Class
  Associated Documents

  • DownloadMC-11010648-0001.pdf↗
• November 13, 2024•Document ID: 11010494

  Service Bulletin/Repair Instructions
  EXTERIOR LIGHTING; VISIBILITY/WIPER

  Mfr Comm. #:

  LI82.10-P-078069

  Date Added:

  November 13, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Rear lamps fogged up/not leaktight. Cause Fogging of the rear lamps is a natural phenomenon, which can occur under certain climatic conditions. This does not lead to any technical impairment of the rear lamps. Remedy Rear lamp: Remedy 1: Clearing fogged/condensed rear lamps: 1. Drive the vehicle into the workshop (temperature higher than +18 °C/+64.4 °F) Note: Do not wash the vehicle or subject it to high-pressure cleaning before the defogging test. 2. Switch off the engine and connect battery support via a charger. 3. Open the trunk. 4. Switch on the exterior lighting. 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 (defogging progress). Note: -If no reduction in the degree of fogging is visible, the rear lamp is defective and must be replaced. -It is not physically possible to defog the headlamps completely – some residual fogging may remain. Fogging does not impair the functionality or the service life of the rear lamps. -Simultaneous fogging of multiple component parts indicates extreme climatic conditions and also does not impair the functionality or the service life of the rear lamps. Remedy 2: You can recognize a defective rear lamp as follows: 1. Check the rear lamps to ensure that no external damage is present, and that the differential aeration cells and the diaphragm are present and correctly seated. -> If there are signs of external damage on the rear lamp, the component parts must be replaced as per WIS instructions. 2. Check the electrical connectors of the plugs and pins. -> If moisture/corrosion/etc. is present, the component part must be replaced as per WIS instructions. 3. Check for leak tightness -> Close all openings with Terostat IX or similar and establish and stabilize via an overpressure (40–50 mbar) via the plug. -> In the event of a sudden pressure drop, the component part must be replaced as per WIS instructions. Note: External damage to the rear lamps does not constitute a warranty or goodwill case.

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  Associated Documents

  • DownloadMC-11010494-0001.pdf↗
• November 12, 2024•Document ID: 11010455

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI27.10-P-075869

  Date Added:

  November 12, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Only vehicles with a variable transfer case are affected. Can be identified through control unit N45 or N15/7 in the quick test When accelerating with light load, vibrations or jolting sensation may come from the drivetrain Cause Modified oil quality of the transfer case over time Remedy Check initial quick test for faults in the following control units N45 - All-wheel drive (ARS) N127 - 'Drivetrain' (PTCU) control unit Y3/8 - Transmission control for 9-gear transmission (VGS) N3/10 - Engine electronics for combustion engine If faults are present, process them as per the guided test in Xentry If no faults are present: Check the oil level of the transmission If the oil level is correct: Unplug the connector for the transfer cases control unit Reassess the vehicle on a subsequent test drive If the complaint no longer occurs: Perform an oil change of the transfer case according to WIS specifications After please complete all transfer case Tech-in processes located under VG control unit Adaptations tab - Resetting the oil service data - Calibration of N15/7 Perform road test of vehicle to bring transmission to operating temperature ( >60C ) Operate vehicle in full circle with steering at full lock - 5x to the left - 5x to the right Reassess the vehicle following the oil change and teach in If the problem continues to occur with the plug removed or after the oil change has been carried out: Create a TIPS case with the following data Initial quick test with fault freeze frame data EEPROM data from Y3/8 Transmission control unit EEPROM data from N45 All-wheel drive Injector performance data

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  • DownloadMC-11010455-0001.pdf↗
• November 12, 2024•Document ID: 11010450

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.85-P-078156

  Date Added:

  November 12, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint When using the offroad display in the MBUX, the "Transparent hood" function cannot be activated using the camera symbol. Cause MBUX FUP5 software: • E504.3 (A 297 904 97 00) • E504.4 (A 297 904 03 01) Remedy Update of head unit A26/17 to the new software: E504.5 (A 297 904 09 01)

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  Associated Documents

  • DownloadMC-11010450-0001.pdf↗
• November 4, 2024•Document ID: 11010435

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER; ENGINE

  Mfr Comm. #:

  LI47.70-P-078563

  Date Added:

  November 11, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint -Check engine light(MIL) is ON. -Current and stored fault code in DCCU and PTCU : P2E9873 The position sensor of the exterior socket flap of the vehicle socket (direct current) has an electrical fault. The actuator does not open. -Starting the vehicle or Charging the vehicle is normal without any issues. Cause Software in the "N116/5 - Direct current charge connection unit (DCCU)" control unit. Remedy SW remedy for N116/5(DC-Charging control unit box) is in progress. Once the software is available, update the software for N116/5 and perform SCN coding of N116/5 For this issue, the vehicle starting or charging functions are not typically affected. Do not replace any parts. Replacing parts will not bring a solution for this issue.

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  • DownloadMC-11010435-0001.pdf↗
• November 2, 2024•Document ID: 11010443

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI07.70-P-078520

  Date Added:

  November 12, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy Check if symptom can be reproduced during normal drive cycle. -If reproducible, diagnose the cause of low pressure in fuel system. -If not reproducible, drain and refill fuel tank with top tier premium gasoline. Clear faults and check vehicle operation. Software solution is in development to prevent fuel boiling in low pressure system. SW release ETA in Q1 2025. **Do not replace parts unless clear part malfunction is determined**

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  • DownloadMC-11010443-0001.pdf↗
• November 1, 2024•Document ID: 11010188

  Over The Air
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  OTA-2024110001

  Date Added:

  November 7, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY24-25 C-Class, CLE, E-Class, GLC (206, 236, 214, 254 platform) vehicles, the infotainment system does not correspond with the latest series production configuration. The infotainment system control unit will receive an OTA software update. MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit. No customer letter will be mailed for this OTA software update.

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  • DownloadMC-11010188-0001.pdf↗
• November 1, 2024•Document ID: 11009552

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI07.70-P-078547

  Date Added:

  November 1, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Engine idle fluctuates or stumbles at approximately 5-10 second intervals. No relevant fault codes are stored. Cause Under analysis Remedy Do not replace parts or perform control unit software updates/adaptations. Create a TIPS case and submit to the powertrain team with the below information: -Video showing the tachometer or actual values from XENTRY diagnosis when symptom present -Quick test -N3/10 MRG2 control unit log -N73/3 EZS control unit log

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  • DownloadMC-11009552-0001.pdf↗
• October 25, 2024•Document ID: 11009517

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI01.00-P-078512

  Date Added:

  October 30, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Engine is making abnormal noise at idle. May be described as rattle, tapping, or knocking. Cause Various Remedy If necessary compare the noise to a like vehicle and if determined to be abnormal proceed with below steps. Submit a TIPS case to the powertrain team with details from the below checks: Check engine maintenance history and oil level. Determine location where noise is most noticeable on engine. Does noise change with engine RPM? Record a video of the noise. Switch off injectors with XENTRY diagnosis one at a time and check if noise changes. Borescope cylinders with pistons at lowest point of travel and document findings with photos.

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  • DownloadMC-11009517-0001.pdf↗
• October 23, 2024•Document ID: 11009125

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.30-P-078529

  Date Added:

  October 25, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint During cold starting, a tortoise symbol may be displayed in the event of reduced engine output. (see attachment) For "non-hybrid vehicles", the thermostat symbol must be displayed. (see attachment) Cause SCN Coding of the N133/1 IC-Instrument-Cluster Remedy Perform N133/1 IC-Instrument-Cluster manual SCN coding.

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  • DownloadMC-11009125-0001.pdf↗
• October 23, 2024•Document ID: 11009122

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY; VISIBILITY/WIPER

  Mfr Comm. #:

  LI82.35-P-078467

  Date Added:

  October 25, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Washer fluid system leaks Cause Various possible causes: 1. Washer fluid reservoir itself. 2. Seal on washer fluid pump/washer fluid reservoir. 3. Washer fluid pump. 3.1. Distributor housing leaks. 3.2. Pump fitting leaks. 3.3. Washer fluid hose cannot be snapped into place on pump fitting. 3.4. Washer fluid hose will not stay on pump fitting, although connector OK. 4. Washer fluid line. 4.1 Connector will not stay on pump fitting because it is broken. 4.2 Sealing ring in connector missing. 4.3 Sealing ring in connector fitted, but deformed and therefore leaks. 4.4 Damage to washer line by animal. 5. Seal on heating washer fluid reservoir/washer fluid reservoir. Remedy Replace defective component parts only. Do not replace any adjacent component parts that are intact. Note: Repair kits for washer line hoses do exist to allow patches for line damage.

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  Associated Documents

  • DownloadMC-11009122-0001.pdf↗
• October 22, 2024•Document ID: 11009138

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; EXTERIOR LIGHTING

  Mfr Comm. #:

  LI82.10-P-078470

  Date Added:

  October 25, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Message in instrument cluster "Adaptive high beams assistant not available/inoperative" or "DIGITAL LIGHT reduced range of functions" in relation to "FC151E29- The level sensor at front left has a malfunction. There is an invalid signal" in the HLI control unit. Cause Older software release, HLI control units Remedy Update of HLI control units (E1n9 / E2n9)

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  • DownloadMC-11009138-0001.pdf↗
• October 16, 2024•Document ID: 11008977

  Service Bulletin/Repair Instructions
  ENGINE; ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI15.40-P-077947

  Date Added:

  October 18, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Combustion engine could no longer be started, only electric driving possible. Cause High-voltage belt-driven starter-alternator faulty. Remedy Requirement: Prior to the implementation of the test work, it must be ensured that the person carrying out this work has successfully completed the required HV qualification to work on HV system.

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  • DownloadMC-11008977-0001.pdf↗
• October 16, 2024•Document ID: 11009036

  Service Bulletin/Repair Instructions
  WHEELS; ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.71-P-078498

  Date Added:

  October 22, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint "Active Emergency Stop Assist Currently Unavailable" and "Active Steering Assist Inoperative" instrument cluster messages along with Tire Pressure Light on in Instrument Cluster. Cause Both systems are temporarily unavailable due to low tire pressures. An active tire pressure monitor light may result in some assistance features being temporarily unavailable until tire pressures are corrected. Remedy Check/adjust tire pressures and reset monitoring through the instrument cluster.

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  Associated Documents

  • DownloadMC-11009036-0001.pdf↗
• October 4, 2024•Document ID: 11008885

  Service Campaign
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  NCU - 2024090017

  Date Added:

  October 9, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 2024 C-Class (206 platform) and GLC (254 platform) vehicles, the door control unit software does not correspond to current production specifications. In this case, the 12V starter battery may sporadically discharge. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the door control unit software.

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  • DownloadMC-11008885-0001.pdf↗
• October 4, 2024•Document ID: 11008712

  Service Bulletin/Repair Instructions
  ENGINE; ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI01.20-P-078446

  Date Added:

  October 8, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Check engine light on. One of the below fault codes is current in the engine control module (N3/10). P04DB29, P04DB31, P04DB79 Cause Open circuit or high resistance to crankcase vent line contact Remedy 1. Check the electrical connector for the relevant vent line contact switch noted below. Refer to attached photos of connection locations. 2. Ensure the bolted connection is secure and bolt can be torqued (9Nm). 3. Check continuity from vent line connection to ME control unit. Repair wire if damage is found. • The circuit from ME provides 5V and is pulled to 0V when the ground connection is intact. M260 P04DB31- S88/15 P04DB79- S88/16 M264 P04DB31- S88/15 P04DB79- S88/16 P04DB29- S88/17 M270/M274 P04DB79- S88/5 Note: This repair is not warrantable if the connection was left loose during previous repair/maintenance.

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  • DownloadMC-11008712-0001.pdf↗
• October 3, 2024•Document ID: 11008883

  Service Bulletin/Repair Instructions
  SEATS

  Mfr Comm. #:

  LI91.10-P-076097

  Date Added:

  October 9, 2024

  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 Review of barcode adhesive label on air intake pipe of height adjuster. The seat frame base with the height adjuster motor can be replaced if the production status is lower than E105 (pic.1: seat label) If the production status is higher than or equal to E105, please create a TIPS case with videos and photos and send to B/C/E inbox. In isolated cases, the label may be located on the inside of the air intake pipe; for this, the seat cushion must be removed.

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  • DownloadMC-11008883-0001.pdf↗
• October 3, 2024•Document ID: 11008879

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.85-P-078068

  Date Added:

  October 9, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint This document applies to vehicles of model series 206 and 254 from SOP (start of production) with NTG7, that do not have SA code 367: The Live Traffic Information Digital Extra is missing, is not available or does not work, even though the license has been purchased from the Mercedes me Store. Cause Problem with the store's offer provision for Digital Extras. Remedy Remedial action is currently being prepared. For the time being, do not undertake any work (SW updates, commissioning, hardware exchanges and similar). These are not effective, as an adaptation of the back end needs to be carried out first. For now, please do not add (arrange to add) SA code 367 manually. As soon as the adaptation has been implemented, this document will be modified accordingly and the necessary steps added. If a customer does not wish to wait for the fix, please direct them to contact the CAC for a refund of the Live Traffic service.

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  • DownloadMC-11008879-0001.pdf↗
• October 3, 2024•Document ID: 11008875

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER; STRUCTURE:BODY

  Mfr Comm. #:

  LI77.21-P-074971

  Date Added:

  October 9, 2024

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Sliding sunroof panel of panoramic sliding sunroof reversed (temporarily, once, multiple times) during closing process without entrapment event. Cause It is not possible to save the relearning process for force progression after each actuation. A, e.g. mechanical sluggishness caused by aging cannot be compensated for here. Remedy Perform commissioning of panoramic roof control unit (PSD, A98, TSSR223). Reference to escalation closing during reversing processes (also described in Operator’s Manual), if vehicle in customer possession (see Video_1): If the panoramic roof blocks up when closing and then opens again slightly (reversing process): Immediately after automatic reversing, wipe forwards on the control panel of the overhead control panel and hold until the panoramic roof is closed. The panoramic roof is closed with greater closing force. If the panoramic roof blocks up again and then opens again slightly (reversing process): repeat previous step. The panoramic roof is closed again with greater closing force.

  Associated Products (2)

  2023 Mercedes-Benz C-Class2022 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11008875-0001.pdf↗