Technical Service Bulletins (TSBs) for the 2023 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 »

    • TSB #LI46.80-P-076622

      Date Announced:
      JUN 26, 2023
      NHTSA ID:
      #10238417

      Rattling/knocking noise from the rear axle steering is audible when driving on rough terrain or cobblestones. Relative movement of toothed rack. Please create a TIPS case. Read More »

    • TSB #LI46.15-P-063353

      Date Announced:
      DEC 01, 2022
      NHTSA ID:
      #10228807

      Complaint Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position (e.g. with Easy Entry function). Cause Height adjustment moves to the top/bottom limit stop and jams. 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 #NCU - 2024040003

      Date Announced:
      APR 19, 2024
      NHTSA ID:
      #10253698

      This is to notify you of the Service Campaign Launch to check the regulation valve in 139 Model Year (MY) 2023 GLC (254 platform) vehicles. The vehicles will be visible and flagged in VMI as OPEN on April 19, 2024. Read More »

    • 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 »

    • TSB #LI20.00-P-076708

      Date Announced:
      JUL 24, 2023
      NHTSA ID:
      #10240165

      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 »

    • TSB #SC-2023060007

      Date Announced:
      JUL 14, 2023
      NHTSA ID:
      #10240256

      CL - 2023060007 Update Powertrain Control Unit Software Read More »

    • TSB #NCU-2023060007

      Date Announced:
      JUN 16, 2023
      NHTSA ID:
      #10238431

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 GLC (254 platform) vehicles, the powertrain control unit software might not meet current specifications. Read More »

    POWER TRAIN

    POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE

    • TSB #NCU-2023060007

      Date Announced:
      JUN 16, 2023
      NHTSA ID:
      #10238431

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 GLC (254 platform) vehicles, the powertrain control unit software might not meet current specifications. 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 - 2024020005

      Date Announced:
      APR 05, 2024
      NHTSA ID:
      #10253697

      This is to notify you of the Service Campaign Launch to update the SCN coding for the drive unit DRVU Control Unit in 66,944 Model Year (MY) 2023 C-Class, GLC, S-Class, and SL (206, 223, 232, and 254 platform) vehicles. 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 #OTA-24240201

      Date Announced:
      FEB 09, 2024
      NHTSA ID:
      #10251176

      Mercedes-Benz AG (??A???A???A?MBAG??A???A???A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY20-23 A-Class, C-Class, CLA, CLS, E-Class, GLA, GLB, GLC, GLE, GLS, AMG GT, S-Class (177, 205, 118, 257, 213, ... 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 Comm Mod

      Date Announced:
      JAN 29, 2024
      NHTSA ID:
      #10249540

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2019-2023 A-Class, CLA, E-Class, G-Class, GLA, GLB, GLC, GLE, GLS, and S-Class (177, 118, 238, 463, 247, 253, 167, and 222 ... 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 #OTA-Comm Mod SW

      Date Announced:
      DEC 07, 2023
      NHTSA ID:
      #10248195

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY19-23 A-Class, C-Class, CLA, CLS, E-Class, EQB, G-Class, GLA, GLB, GLC, GLE, GLS, AMG GT, S-Class (177, 205, 118, 257, 213, ... Read More »

    • TSB #OTA-Head Unit SW

      Date Announced:
      DEC 01, 2023
      NHTSA ID:
      #10248203

      Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY19-23 A-Class, CLA, CLS, E-Class, EQB, GLA, GLB, GLC, GLE, GLS, AMG GT (177, 118, 257, 213, 238, 243, 247, 253,167, 290 platform) vehicles, the ... Read More »

    • TSB #NCU -MBUX SW OTA

      Date Announced:
      OCT 20, 2023
      NHTSA ID:
      #10244748

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY21-23 C-Class, EQS, S-Class, SL, EQE, GLC (206, 296, 297, 223, 232, 294, 295, 254 platform) vehicles, the head unit software ... 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 #NCU-HU SW Update

      Date Announced:
      AUG 28, 2023
      NHTSA ID:
      #10241527

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2018-2023 C-Class, EQE, EQE SUV, EQS, EQS SUV, GLC, GLE and S-Class (206, 295, 294, 297, 296, 254, 167 and 223 platform) ... 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 »

    • TSB #LI20.00-P-076708

      Date Announced:
      JUL 24, 2023
      NHTSA ID:
      #10240165

      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 »

    • TSB #NCU - HU Update

      Date Announced:
      JUL 19, 2023
      NHTSA ID:
      #10240250

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2021-2024 C-Class, EQE, EQE SUV, EQS, EQS SUV, GLC, GLE and S-Class (206, 295, 294, 297, 296, 254, 167 and 223 platform) ... Read More »

    • TSB #SC-2023060007

      Date Announced:
      JUL 14, 2023
      NHTSA ID:
      #10240256

      CL - 2023060007 Update Powertrain Control Unit Software Read More »

    • TSB #LI80.61-P-076671

      Date Announced:
      JUL 13, 2023
      NHTSA ID:
      #10240169

      The trunk lid only opens/closes successfully after several attempts. Coding in the Hands-Free Access control unit (N38). Perform SCN coding in Hands-Free Access control unit (N38). Read More »

    • TSB #LI82.85-P-076200

      Date Announced:
      APR 19, 2023
      NHTSA ID:
      #10235670

      Complaint Station logos are no longer displayed in the radio after updating or SCN coding the A26/17 head unit. Cause Under analysis. Remedy Currently, there is no remedy available. Please open a TIPS case for support. Read More »

    • TSB #LI82.85-P-076157

      Date Announced:
      APR 11, 2023
      NHTSA ID:
      #10235669

      Complaint Brief connectivity interruptions when using Apple CarPlay over Wi-Fi, for example when driving underneath toll bridges. Cause There may be interruptions to WiFi as a result of external interference. Read More »

    • TSB #LI82.70-P-075967

      Date Announced:
      MAR 01, 2023
      NHTSA ID:
      #10233791

      Complaint Wireless charging start/charging behavior of iPhone 14 is not optimal Cause Change in iPhone software (iOS) Remedy There will be optimized software for iPhone 14 iOS (target date 05/2023). 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:SOFTWARE

    • TSB #OTA-24240201

      Date Announced:
      FEB 09, 2024
      NHTSA ID:
      #10251176

      Mercedes-Benz AG (??A???A???A?MBAG??A???A???A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY20-23 A-Class, C-Class, CLA, CLS, E-Class, GLA, GLB, GLC, GLE, GLS, AMG GT, S-Class (177, 205, 118, 257, 213, ... Read More »

    • TSB #NCU -MBUX SW OTA

      Date Announced:
      OCT 20, 2023
      NHTSA ID:
      #10244748

      Mercedes-Benz AG (??A?A?MBAG??A?A?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY21-23 C-Class, EQS, S-Class, SL, EQE, GLC (206, 296, 297, 223, 232, 294, 295, 254 platform) vehicles, the head unit software ... Read More »

    • TSB #NCU-HU SW Update

      Date Announced:
      AUG 28, 2023
      NHTSA ID:
      #10241527

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2018-2023 C-Class, EQE, EQE SUV, EQS, EQS SUV, GLC, GLE and S-Class (206, 295, 294, 297, 296, 254, 167 and 223 platform) ... 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-076671

      Date Announced:
      JUL 13, 2023
      NHTSA ID:
      #10240169

      The trunk lid only opens/closes successfully after several attempts. Coding in the Hands-Free Access control unit (N38). Perform SCN coding in Hands-Free Access control unit (N38). Read More »

    • TSB #NCU-2023050002

      Date Announced:
      MAY 26, 2023
      NHTSA ID:
      #10237268

      Mercedes-Benz AG (a??MBAGa??), the manufacturer of Mercedes-Benz, has determined that on certain Model Year (a??MYa??) 2023 GLC (253 platform) vehicles, the seam seal on a small portion of the right A-pillar does not correspond with ... 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 »

    • TSB #LI80.61-P-076671

      Date Announced:
      JUL 13, 2023
      NHTSA ID:
      #10240169

      The trunk lid only opens/closes successfully after several attempts. Coding in the Hands-Free Access control unit (N38). Perform SCN coding in Hands-Free Access control unit (N38). 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

    • TSB #LI82.62-P-076756

      Date Announced:
      JUL 28, 2023
      NHTSA ID:
      #10240159

      Perceptible volume jumps at 15 and 10 mph. When reducing the speed of the vehicle, the volume is reduced in clearly perceptible jumps. This is particularly perceptible at a moderate basic volume (i.e. Read More »

    EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.

    • TSB #LI82.62-P-076756

      Date Announced:
      JUL 28, 2023
      NHTSA ID:
      #10240159

      Perceptible volume jumps at 15 and 10 mph. When reducing the speed of the vehicle, the volume is reduced in clearly perceptible jumps. This is particularly perceptible at a moderate basic volume (i.e. 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 »