Mercedes-Benz GLB-Class Service Bulletins (2026)

66 manufacturer communications on file.

• December 3, 2025•Document ID: 11026020

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.10-P-078888

  Date Added:

  December 3, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The check engine light illuminates or the 48 V message is displayed in the instrument cluster Cause Fault code "P0A7F00" stored in the 48 V battery G1/3 and/or is current. Remedy 1. Perform software update: In the given problem case, update the software for the control unit G1/3 - 48 V on-board electrical system battery (48V LIB) : --> Remedy SW A0019020424 25/12 2. Carry out SOH reset routine: - Switch on ignition - Read actual value 209 in XENTRY Diagnostics at G1/3 (48 V battery) "State of Health Capacity-SOHC" Valid for OBD markets -- If the value is > 80%, no restoration process required -- If the value is < 81%, continue with the following steps Valid for non-OBD markets -- If the value is > 75%, no restoration process required -- If the value is < 76%, continue with the following steps Perform capacity restoration procedure: - Discharge 48 V battery in vehicle with ignition "On" and check SOC of 48 V battery in the instrument cluster's workshop menu - For SOC < 25%: Stop unloading and lock the vehicle with the key out of range; (bus idle) - After 1.5 h of bus idle: Charging the 48V battery - When SOC reaches or exceeds 65%, stop charging and lock the vehicle with the key out of range; (bus idle) - After 1.5 h of bus idle: Switch on ignition Read actual value 209 in XENTRY Diagnostics at G1/3 (48 V battery) "State of Health Capacity-SOHC" Valid for OBD markets - SOH > 82%: Process is complete and clear fault memory - SOH < 83%: Repeat the steps once more. If the value is still too low after 5 repetitions: Cancel healing process and provide feedback in TIPS case.

  Associated Products (26)

  2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz GLA-Class2024 Mercedes-Benz GLB-Class2023 Mercedes-Benz CLA-Class2023 Mercedes-Benz GLA-Class2023 Mercedes-Benz GLB-Class2022 Mercedes-Benz CLA-Class2022 Mercedes-Benz GLA-Class2022 Mercedes-Benz GLB-Class2021 Mercedes-Benz CLA-Class2021 Mercedes-Benz GLA-Class2021 Mercedes-Benz GLB-Class2020 Mercedes-Benz CLA-Class2020 Mercedes-Benz GLB-Class+ 6 more
  Associated Documents

  • DownloadMC-11026020-0001.pdf↗
• November 15, 2025•Document ID: 11025648

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI33.30-P-056665

  Date Added:

  November 20, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa). Note: Sound file in attachment Cause If the complaint is eliminated by experimentally loosening the outboard collar nut (by 1 turn), the problem is due to micromovement in the connection between the wheel bearing inner race and the joint housing of the side shaft. Note: The collar nut must always be replaced after being loosened and must be tightened to the specified torque. Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove outboard side shafts (extract outer joint gearing from wheel hub) 2. Clean contact surface A (see picture file in attachment "Outer joint housing before") before coating with Molykote, using "spirit" (free of dust and grease) 3. Coat contact surface A (see image file in attachment "Outer joint housing after") using Molykote and leave to dry for one hour in removed condition 4. Reinstall side shafts Note: Before using the antifriction coating (Molykote), stir or shake it well (for at least 1 minute).

  Associated Products (157)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz GLA-Class2024 Mercedes-Benz GLB-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz GLE-Class2023 Mercedes-Benz C-Class+ 137 more
  Associated Documents

  • DownloadMC-11025648-0001.pdf↗
• November 6, 2025•Document ID: 11025544

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI68.20-P-080012

  Date Added:

  November 14, 2025

  Manufacturer:

  MERCEDES BENZ

  Summary

  Complaint USB port not functioning properly. Cause Most reported USB port issues are due to improper use or contamination. Note: Any repair costs must be discussed with the customer beforehand. Common external factors identified include: • Fluid intrusion • Broken bushings or physical damage See attachments. Remedy If a component needs replacement without visible external damage, submit a detailed TIPS case. Include information on all connected external devices (e.g., charging cables, USB drives, hard drives).

  Associated Products (67)

  2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-Class2024 Mercedes-Benz EQB-Class+ 47 more
  Associated Documents

  • DownloadMC-11025544-0001.pdf↗
• October 31, 2025•Document ID: 11024810

  Service Campaign
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  NCU - 2025100004

  Date Added:

  November 4, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the 48-V on-board electrical system battery software might not meet current production specifications. A communication error may occur when reactivating the 48V lithium-ion battery during reinitialization. The system might detect and store this error, causing the malfunction indicator lamp to illuminate unnecessarily. Remedy MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update 48-V onboard electrical system battery software.

  Associated Products (20)

  2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz GLA-Class2024 Mercedes-Benz GLB-Class2023 Mercedes-Benz CLA-Class2023 Mercedes-Benz GLA-Class2023 Mercedes-Benz GLB-Class2022 Mercedes-Benz CLA-Class2022 Mercedes-Benz GLA-Class2022 Mercedes-Benz GLB-Class2021 Mercedes-Benz CLA-Class2021 Mercedes-Benz GLA-Class2021 Mercedes-Benz GLB-Class2020 Mercedes-Benz CLA-Class2020 Mercedes-Benz GLB-Class
  Associated Documents

  • DownloadMC-11024810-0001.pdf↗
• October 29, 2025•Document ID: 11024632

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI35.31-P-077429

  Date Added:

  October 30, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Instrument cluster message "4MATIC inoperative". The following fault code may be present in all-wheel drive control unit N15/17: P147354 - Erroneous adaptation of the transfer case. The calibration is missing. P14759A - The coupling of the transfer case has malfunctioned. The operating conditions for the component or the system have not been fulfilled. Cause Coupling of the rear axle differential has reached the wear limit or a coupling issue is present. Remedy Please read off the part number of the rear axle differential installed on the vehicle and check the table below to determine if the differential can be repaired with a clutch repair kit. The table below is also in attachments. (If needed, check validity for further clarification of model designations). Complaint Instrument cluster message "4MATIC inoperative". The following fault code may be present in all-wheel drive control unit N15/17: P147354 - Erroneous adaptation of the transfer case. The calibration is missing. P14759A - The coupling of the transfer case has malfunctioned. The operating conditions for the component or the system have not been fulfilled. Cause Coupling of the rear axle differential has reached the wear limit or a coupling issue is present. Remedy Please read off the part number of the rear axle differential installed on the vehicle and check the table below to determine if the differential can be repaired with a clutch repair kit. The table below is also in attachments. (If needed, check validity for further clarification of model designations)

  Associated Products (24)

  2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz GLA-Class2024 Mercedes-Benz GLB-Class2023 Mercedes-Benz CLA-Class2023 Mercedes-Benz GLA-Class2023 Mercedes-Benz GLB-Class2022 Mercedes-Benz A-Class2022 Mercedes-Benz CLA-Class2022 Mercedes-Benz GLA-Class2022 Mercedes-Benz GLB-Class2021 Mercedes-Benz A-Class2021 Mercedes-Benz CLA-Class2021 Mercedes-Benz GLA-Class2021 Mercedes-Benz GLB-Class+ 4 more
  Associated Documents

  • DownloadMC-11024632-0001.pdf↗
• October 20, 2025•Document ID: 11024405

  Service Bulletin/Repair Instructions
  SERVICE BRAKES

  Mfr Comm. #:

  LI42.10-P-079904

  Date Added:

  October 21, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint At low speeds and light brake pressure, brakes will make a groaning or honking noise. Cause Frictional vibrations with very light brake pressure/modulations. Remedy This condition can be duplicated on most vehicles. To validate, use a like for like reference vehicle. The noise is normal behavior under the conditions listed. With very light brake pressure this noise can be induced/caused due to normal brake pad and brake rotor vibrations. Exchanging brake components will not rectify.

  Associated Products (98)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLA-Class+ 78 more
  Associated Documents

  • DownloadMC-11024405-0001.pdf↗