Technical Service Bulletins (TSBs) for the 2024 GLC300 are official communications between Mercedes-Benz & their dealerships that describe processes for troubleshooting or fixing certain common problems. All vehicle manufacturers are required by U.S. law to make their TSBs available to the public.

    STEERING

    • TSB #LI46.10-P-077313

      Date Announced:
      JAN 24, 2024
      NHTSA ID:
      #10249482

      The steering wheel generates grinding noises between the steering wheel and steering column switch module during steering maneuvers See example file in the attachments area: Lenkrad-Schleifger??A?usch_SteeringWheel-GrindingNoises. Read More »

    • TSB #LI46.10-P-077314

      Date Announced:
      JAN 24, 2024
      NHTSA ID:
      #10249495

      Noises in the steering column area when steering. Under analysis. Check which area of the steering column the noises occur in. Read More »

    • TSB #LI46.35-P-077076

      Date Announced:
      DEC 04, 2023
      NHTSA ID:
      #10248157

      Control unit N68 - electric power steering Fault P063544 - The electric power steering has a malfunction. There is a fault in the data memory. Read More »

    SUSPENSION

    • TSB #LI32.25-P-076956

      Date Announced:
      OCT 12, 2023
      NHTSA ID:
      #10244735

      Wheezing noises from the front shock absorbers when passing over surface undulations and rough road. The noises may become more conspicuous with warm damper oil. The flow noises of the damper oil are currently being analyzed. Read More »

    SUSPENSION:FRONT:SHOCK ABSORBER

    • TSB #LI32.25-P-076956

      Date Announced:
      OCT 12, 2023
      NHTSA ID:
      #10244735

      Wheezing noises from the front shock absorbers when passing over surface undulations and rough road. The noises may become more conspicuous with warm damper oil. The flow noises of the damper oil are currently being analyzed. Read More »

    ENGINE AND ENGINE COOLING

    • TSB #LI20.00-P-076708

      Date Announced:
      APR 15, 2024
      NHTSA ID:
      #10253720

      Check engine lamp activated, coolant warning message, and engine fan running at full speed. Below fault codes stored in N127 PTCU related to LIN network components. Read More »

    ELECTRICAL SYSTEM

    • TSB #OTA - 20240402

      Date Announced:
      APR 26, 2024
      NHTSA ID:
      #10253703

      This is to notify you of the Service Campaign OTA update for the MBUX system software in 750,313 Model Year (MY) MY19-24 A-Class, CLA, CLS, E-Class, EQB, GLA, GLB, GLC, GLE, GLS, GT 4-door (177, 118, 257, 213, 238, 243, 247, 253,167, 290 ... Read More »

    • TSB #LI82.85-P-077312

      Date Announced:
      APR 18, 2024
      NHTSA ID:
      #10253714

      The update of the RAMSES 1.1 module to the SW version E139.4 results in a fault in the vtime of the module and therefore to the following possible connection problems: Remote status: The time stamp of the last update that is displayed ... Read More »

    • TSB #NCU - 2024030012

      Date Announced:
      APR 12, 2024
      NHTSA ID:
      #10253704

      TEMPORARY DEACTIVATION OF CAMPAIGN DUE TO DIFFICULTY WITH THE SOFTWARE UPLOAD. AN UPDATED NCU WITH WORK INSTRUCTIONS WILL BE PROVIDED ONCE AVAILABLE. The vehicles were visible and flagged in VMI as "OPEN" on March 28, 2024. Read More »

    • TSB #NCU-2024030012

      Date Announced:
      MAR 28, 2024
      NHTSA ID:
      #10252710

      Mercedes-Benz AG, the manufacturer of Mercedes-Benz, has determined that on certain MY 2024 C-Class, GLC, and S-Class (206, 223, 254 platform) vehicles, the electronic ignition lock control unit software does not meet current production ... Read More »

    • TSB #LI00.20-P-077615

      Date Announced:
      MAR 15, 2024
      NHTSA ID:
      #10252773

      The following symptoms may be present in the instrument cluster: 1. "Perform vehicle handover" in the workshop menu to start the maintenance computer for service A/B cannot be carried out. 2. Read More »

    • TSB #OTA-24240203

      Date Announced:
      FEB 29, 2024
      NHTSA ID:
      #10251192

      Mercedes-Benz AG (??A???A???A?MBAG??A???A???A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 21-24 C-Class, EQE, EQS, GLC, GLE, GLS, S-Class, SL (206, 294, 295, 296, 297, 254, 167, 223, 232 platform) ... Read More »

    • TSB #LI82.85-P-077312

      Date Announced:
      FEB 02, 2024
      NHTSA ID:
      #10251181

      Complaint Updating the RAMSES 1.1 module to the latest SW-version E139.4 will lead to an error in the modules vtime and therefore the following possible connectivity issues: Remote Status: ??A?A? The last updated timestamp shown in ... Read More »

    • TSB #NCU-OTA MBUX SW

      Date Announced:
      JAN 24, 2024
      NHTSA ID:
      #10249541

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2021-2023 C-Class, EQE, EQS, GLC, S-Class, and SL (206, 294, 295, 296, 297, 254, 223, and 232 platform) vehicles, there is ... Read More »

    • TSB #LI82.62-P-077311

      Date Announced:
      JAN 02, 2024
      NHTSA ID:
      #10249539

      No audio is output either in radio mode, or with media playback via app, Bluetooth or USB. In such cases, "Playback not active" is shown in the display. Mute line between communication module N112/2 and sound control unit N40/3. Read More »

    • TSB #Ll54.10-P-076896

      Date Announced:
      SEP 08, 2023
      NHTSA ID:
      #10243306

      12V message in IC when starting the vehicle. SW updates need to be performed. Follow the guided test for FC U116000 in N73/3*1 EIS CU. Perform the SW checks and updates. Fully charge both 12V and 48V batteries. Read More »

    • TSB #Ll54.10-P-076823

      Date Announced:
      AUG 22, 2023
      NHTSA ID:
      #10241510

      In the instrument cluster, the symbol for "12 V battery" and the message "Switch on vehicle" may sporadically be displayed. Read More »

    • TSB #LI82.70-P-076832

      Date Announced:
      AUG 21, 2023
      NHTSA ID:
      #10241536

      Phone call log is not shown in the MBUX display. If the telephone connects with the head unit again, the call log may not be sent. Read More »

    ELECTRICAL SYSTEM:BODY CONTROL MODULE:SOFTWARE

    • TSB #LI82.85-P-077312

      Date Announced:
      FEB 02, 2024
      NHTSA ID:
      #10251181

      Complaint Updating the RAMSES 1.1 module to the latest SW-version E139.4 will lead to an error in the modules vtime and therefore the following possible connectivity issues: Remote Status: ??A?A? The last updated timestamp shown in ... Read More »

    ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

    • TSB #LI00.20-P-077615

      Date Announced:
      MAR 15, 2024
      NHTSA ID:
      #10252773

      The following symptoms may be present in the instrument cluster: 1. "Perform vehicle handover" in the workshop menu to start the maintenance computer for service A/B cannot be carried out. 2. Read More »

    ELECTRICAL SYSTEM:PROPULSION SYSTEM:FUEL CELL

    • TSB #LI72.20-P-075746

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252777

      Tailgate opens unintentionally. Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Read More »

    VISIBILITY:SUN/MOON ROOF ASSEMBLY

    • TSB #LI77.21-P-075807

      Date Announced:
      OCT 02, 2023
      NHTSA ID:
      #10244745

      Sliding sunroof panel of panoramic sliding sunroof reversed (temporarily, once, multiple times) during closing process without entrapment event. Sensitive parameterization of the automatic reversing function of the panoramic roof. Read More »

    STRUCTURE

    • TSB #LI72.20-P-075746

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252777

      Tailgate opens unintentionally. Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Read More »

    • TSB #NCU - 2024030011

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252837

      Check right tailgate, rework if necessary Check/test procedure 1. Remove top center rear spoiler. For basic data, see AR72.20-P-4000WT. 2. Check outer top right of rear-end door for constriction and crack formation (Figure 1). Read More »

    • TSB #NCU-2023120004

      Date Announced:
      DEC 14, 2023
      NHTSA ID:
      #10248167

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 GLC (254 platform) vehicles, the panoramic sliding sunroof control unit software does not correspond to the latest ... Read More »

    • TSB #LI77.21-P-075807

      Date Announced:
      OCT 02, 2023
      NHTSA ID:
      #10244745

      Sliding sunroof panel of panoramic sliding sunroof reversed (temporarily, once, multiple times) during closing process without entrapment event. Sensitive parameterization of the automatic reversing function of the panoramic roof. Read More »

    • TSB #LI72.20-P-075232

      Date Announced:
      AUG 18, 2023
      NHTSA ID:
      #10241515

      When operating a control point to open the trunk lid or the tailgate, the trunk lock unlocks, but there is no actuation of the trunk control/tailgate control drive unit (M51/3). Faulty microswitch signal of trunk lock. Read More »

    • TSB #LI80.61-P-076702

      Date Announced:
      JUL 24, 2023
      NHTSA ID:
      #10240166

      Trunk lid cannot be opened and closed with HANDS-FREE ACCESS (HFA). In the EZS control unit (N73), the fault code B1F8C14 ("The top sensor of the rear switch module has malfunctioned. There is a short circuit to ground or an open circuit. Read More »

    STRUCTURE:BODY:TAILGATE

    • TSB #NCU - 2024030011

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252837

      Check right tailgate, rework if necessary Check/test procedure 1. Remove top center rear spoiler. For basic data, see AR72.20-P-4000WT. 2. Check outer top right of rear-end door for constriction and crack formation (Figure 1). Read More »

    • TSB #LI72.20-P-075232

      Date Announced:
      AUG 18, 2023
      NHTSA ID:
      #10241515

      When operating a control point to open the trunk lid or the tailgate, the trunk lock unlocks, but there is no actuation of the trunk control/tailgate control drive unit (M51/3). Faulty microswitch signal of trunk lock. Read More »

    STRUCTURE:BODY:TRUNK LID

    • TSB #LI72.20-P-075746

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252777

      Tailgate opens unintentionally. Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Read More »

    STRUCTURE:BODY:HOOD

    • TSB #LI72.20-P-075746

      Date Announced:
      MAR 11, 2024
      NHTSA ID:
      #10252777

      Tailgate opens unintentionally. Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Read More »

    LATCHES/LOCKS/LINKAGES

    • TSB #LI72.20-P-075232

      Date Announced:
      AUG 18, 2023
      NHTSA ID:
      #10241515

      When operating a control point to open the trunk lid or the tailgate, the trunk lock unlocks, but there is no actuation of the trunk control/tailgate control drive unit (M51/3). Faulty microswitch signal of trunk lock. Read More »

    SEATS

    • TSB #LI91.18-P-077075

      Date Announced:
      DEC 04, 2023
      NHTSA ID:
      #10248162

      Crease formation on genuine leather seat covers in vehicles with low mileage ??A?A? Objects left on the seats for extended periods of time (pressure marks). ??A?A? Objects wedged between the seat backrest and seat cushion (e.g. Read More »

    • TSB #LI91.10-P-076798

      Date Announced:
      AUG 18, 2023
      NHTSA ID:
      #10241519

      Noise at front seats between seat-back lining and function carrier. Noise is caused by friction of the two component parts. Remove the seat-back lining (back panel) of the front seat concerned using a special tool. Read More »

    COMMUNICATION:MANUFACTURER TELEMATICS

    • TSB #LI82.85-P-077312

      Date Announced:
      FEB 02, 2024
      NHTSA ID:
      #10251181

      Complaint Updating the RAMSES 1.1 module to the latest SW-version E139.4 will lead to an error in the modules vtime and therefore the following possible connectivity issues: Remote Status: ??A?A? The last updated timestamp shown in ... Read More »

    EQUIPMENT:ELECTRICAL:INFOTAINMENT

    • TSB #LI82.70-P-076832

      Date Announced:
      AUG 21, 2023
      NHTSA ID:
      #10241536

      Phone call log is not shown in the MBUX display. If the telephone connects with the head unit again, the call log may not be sent. Read More »

    EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

    • TSB #NCU - 2024030010

      Date Announced:
      MAR 22, 2024
      NHTSA ID:
      #10252747

      This is to notify you of the Service Campaign Launch to update the digital and replace the printed operators manual in 39 Model Year (MY) 2024 GLC, GLS, and AMG GT vehicles (167, 254, 192 and 290 platform). Read More »