2025 Mercedes-Benz GLC 300 4MATIC Technical Service Bulletins

140 technical service bulletins (TSBs) are on record for the 2025 Mercedes-Benz GLC 300 4MATIC. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11025646Nov 18, 2025Electrical system. 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 but shows no visible external damage, submit a detailed TIPS case…
• 11025648Nov 15, 2025Transmission and drivetrain. 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…
• 11025544Nov 6, 2025Electrical system. 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.
• 11025536Nov 5, 2025Transmission and drivetrain. Complaint Harsh 2-1 downshifts when coming to a stop with ECO start-stop function turned OFF. Note: When ECO start-stop is active, the engine is shut off before the 2-1 shift and the complaint will not occur. Cause Software application when engine is running. Remedy Short-term remedy: Perform IPR and follow the instruction to perform standstill adaptations. Long-term Solution: Aftersales software is currently in…
• 11025150Nov 5, 2025Transmission and drivetrain. Complaint A harsh 5-4 downshift can be felt during deceleration while braking or coasting. It may be mistaken for a hard brake engagement Cause Poor learning of brake B06 adaptation values over time. Remedy Short-term remedy: 1. Perform IPR and follow the instructions. 2. Perform resetting of deceleration values (VGS > Special Procedures > Special procedure > Resetting learned values Deceleration mode) 3. Perform…
• 11025100Nov 3, 2025Transmission and drivetrain. Complaint Only vehicles with a variable transfer case are affected. This 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. It may be mistaken for a harsh shift. Cause Modified oil quality of the transfer case over time Remedy 1. Check initial quick test for faults in the following control units.
• 11024502Oct 27, 2025Suspension. Complaint Wheezing noises/squeaking noises from the front shock absorbers when passing over surface undulations and rough road. Noise MUST match those heard in the attached videos. Cause • Wheezing noises: Flow noises of the damper oil • Squeaking noises: From the mechanical rubber valve in the dividing piston Remedy In case of complaints, the front shock absorbers must be replaced with parts past clean point. •…
• 11024426Oct 24, 2025Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject 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.
• 11024405Oct 20, 2025Brakes. 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…
• 11024276Oct 10, 2025Seats. Complaint The "Easy entry and exit feature" function deactivates itself after a brief period. (see attachment). Cause The cause is currently being investigated. Remedy Update the HU7 to the latest software version, then perform a factory reset of the HU7. Steps to perform factory reset: Navigate to Settings > System > Reset > Reset to factory settings and confirm.
• 11023932Oct 3, 2025Other or unknown. Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the TIREFIT sealant bottle may not meet specifications. The possibility exists that the sealant bottle may leak or may have been removed from the vehicle. Remedy MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will replace or install the TIREFIT bottle in the trunk.
• 11023347Sep 25, 2025Electrical system. Complaint The result from the XENTRY battery test does not match the current state of the battery. Cause The XENTRY battery tester uses the stored on-board electrical system data in the SAM module to access the health of the 12 volt battery. The XENTRY battery test may not take into account a single discharge event because the SAM or EZS cannot record the data if the battery is discharged. Note: A discharged…
• 11023194Sep 16, 2025Electrical system. Complaint After a software update from campaign 2025050001 of component LIB48_222 - G1/3 (48 V on-board electrical system battery) from software release A 000 902 50 48 to software release A 000 902 15 89, the fault code B183319 may be output. B183319 "The battery for the 48V on-board electrical system has a malfunction.
• 11023107Sep 13, 2025Electrical system. Issue Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the High Voltage Battery (“HVB”) AC charger software does not correspond to current production specifications. As a consequence, a HVB MIL may illuminate during charging due to fluctuations in power consumption of the charging socket actuator. Remedy MBUSA will conduct a service campaign. An…
• 11023049Sep 9, 2025Engine. Complaint 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.
• 11023047Sep 5, 2025Electrical system. Complaint The Apple Music app is no longer available in the head unit apps menu after updating the software of the (A26/17 - MBUX multimedia system + instrument cluster (head unit)) to E333.8 / A236 904 19 00. Cause Head unit software (CIVIC206) Remedy NOTE: Do not replace any component parts A remedy is currently being developed and will be communicated once finalized. Once service is restored, the app will be…
• 11022819Sep 5, 2025Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, there is a new software release for the MBUX Infotainment system. An OTA update will enhance both functionality and entertainment features. The update introduces Dolby Atmos support for in-car apps, improvements to the MBUX calendar app, and the launch of MBUX SOUND DRIVE.
• 11023026Sep 4, 2025Electrical system. Complaint 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. Cause Mute line between communication module N112/2 and sound control unit N40/3. Remedy Check the mute cable between control units N112/2 (communication module) and N40/3 (sound system). • Inspect the cable and plug contacts for damage or deformation. •…
• 11022842Sep 4, 2025Suspension. Complaint Metallic clattering/noise from the area of the dashboard on uneven roads Cause A loose upper metal plate in the head bearing (support bushing) causes the noises. Remedy 1 - Check for loose metal plate by tapping your finger against the metal plate in the head bearing. See video "Rattling Noises" for reference. Metallic noises audible? • Yes: Replace head bearing (support bushing). • No: Replace…
• 11023024Sep 3, 2025Exterior lighting. 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 control unit HLI/LED headlamp range adjustment front left. (HLI_FL223 HW: A2239017717/ HWVersion: 23.11.00) Cause Electronic interference occurring at the sensor…
• 11022529Aug 29, 2025Suspension. Complaint Wheezing noises/squeaking noises from the front shock absorbers when passing over surface undulations and rough road. Noise MUST match those heard in the attached videos. Cause • Wheezing noises: Flow noises of the shock absorber fluid • Squeaking noise: From the mechanical rubber valve in the dividing piston Remedy Replace shock absorber(s).
• 11022528Aug 29, 2025Suspension. Complaint Clattering noise from area of hood with steel suspension. Cause Missing helical spring shim (blue part as shown in attached picture "Helical Spring Shim"). Remedy Check whether the blue helical spring shim is installed. • If NOT present: Install the spring shim. • If present: Provide sound/video file with matching noise, verification of no installed spring shim via picture, and open a TIPS case…
• 11022204Aug 29, 2025Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the charging function does not correspond to the current series production configuration. The charging system software will be updated to stabilize the charging function of the vehicle. MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the…
• 11022385Aug 28, 2025Electrical system. Complaint Message in Instrument Cluster for "Active Distance Assist not enabled, but can be purchased subsequently" even if Digital Extra: Active Distance Assist DISTRONIC (207) has already been activated/purchased via the application. Cause On some vehicles with Digital Extra: Active Distance Assist DISTRONIC (code 207), it may be that the function cannot be enabled via the application or is no longer available in…
• 11022056Aug 5, 2025Steering. Complaint Valeo Steering Column Module (N80) goes into bootloader after updating software to A2239028729. To verify the supplier and software number of the steering column module. See attachment "Supplier Identification" for assistance. Cause MRSM/SCCM flashed to SW A2239028729 Remedy Please send VIN specific ID1 Support Package online using the XENTRY Kit used during the time the error occurred. Then, create an…
• 11022055Aug 5, 2025Steering. Complaint Criteria: • Customer concern for ESP/Brake or Steering yellow instrument cluster message. • DTC's C220564 or P161447 in the Steering Column Control Module (N80). • N80 supplier is "BCS". • "Hardware" or "Boot Software" version number is 23/18 000 or greater. To check which supplier steering column module is in the vehicle and where to find the hardware version number. Please see attachment, "N80 Control…
• 11022050Aug 5, 2025Suspension, Steering. Complaint Customer concern for ESP/Brake or Steering yellow instrument cluster message AND C220564 in the N80 Steering Column Control Module (Valeo Parts only). To check which supplier steering column module is present in the vehicle, see attachment "Supplier Identification". Cause Triggered due to communication related software timing. Remedy New software A2239026336. Update N80 (Steering Column Module) to target…
• 11021154Jul 31, 2025Seats. Complaint The customer complains about squeaking/creaking noises on uneven roadways, on bends or when moving in their seat. Cause Noise in the backrest adjustment mechanism Remedy The adjustment mechanism is treated with dry lubricant spray A000 989 35 60 to rectify the noise. To do this, proceed as follows: • Move the seat to the front position and put the backrest into a lying position.
• 11021153Jul 31, 2025Seats. Complaint The "Easy entry and exit feature" function deactivates itself after a brief period. (see attachment). Cause The cause is currently being investigated. Remedy 1. Update the A26/17 MBUX multimedia system (head unit) to the latest software version FUP5 Opt. (E505.4) or newer. 2. Perform a factory reset of the head unit after the update. If the issue continues: • Capture a head unit log and a Body CAN trace…
• 11021152Jul 31, 2025Body and structure. Complaint Fuel filler flap/socket flap sticks, cannot be opened Cause Under analysis. Remedy Create TIPS case with fault description and videos of the flap sticking. Send the TIPS case to the Body/Chassis/Entertainment inbox.
• 11021147Jul 31, 2025Electrical system. Complaint - Engine diagnosis indicator lamp (MIL) lights up. - Current and saved fault code in DCCU and powertrain control unit (PTCU): P2E9873 The position sensor of the external socket flap of the vehicle socket (direct current) indicates an electrical fault. The actuator does not open. - The vehicle starts or charges normally and without any problems. Cause Software in the control unit "N116/5 - DC…
• 11021143Jul 26, 2025Forward collision avoidance, Electrical system, Lane departure. Complaint Hand detection system not operating correctly / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" Cause Possible causes: the hand detection mat, the hand detection control unit, the contacts and the steering wheel harness.
• 11021108Jul 25, 2025Suspension. 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.
• 11020951Jul 25, 2025Forward collision avoidance, Electrical system, Lane departure. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has updated driver assistance system software available for certain subject vehicles. The updated software improves system stability and enhances the robustness of the driver assistance system. 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…
• 11020873Jul 17, 2025Electrical system. Complaint Diverse functional limitations in the vehicle in combination with various warning and fault messages in the instrument cluster display. Cause Communication timeouts mean that communication errors may occur in the on-board electrical system, which can result in various fault messages being displayed in the instrument cluster. This could be down to delayed feedback from the drivetrain control unit (N127)…
• 11020699Jul 12, 2025Electrical system. Complaint The following most common complaints may be observed: • Brief connectivity interruptions when using Apple CarPlay over Wi-Fi • Audio cuts out • Device not recognized • No operation possible Cause There are multiple possible causes for an iPhone disconnecting from a vehicle’s head unit while using Apple CarPlay.
• 11020696Jul 11, 2025Electrical system. Complaint - Engine diagnosis indicator lamp (MIL) lights up. - Current and saved fault code in DCCU and powertrain control unit (PTCU): P2E9873 The position sensor of the external socket flap of the vehicle socket (direct current) indicates an electrical fault. The actuator does not open. - The vehicle starts or charges normally and without any problems. Cause Software in the control unit "N116/5 - DC…
• 11020642Jul 7, 2025Electrical system. Complaint - Engine diagnosis indicator lamp (MIL) lights up. - Current and saved fault code in DCCU and powertrain control unit (PTCU): P2E9873 The position sensor of the external socket flap of the vehicle socket (direct current) indicates an electrical fault. The actuator does not open. - The vehicle starts or charges normally and without any problems. Cause Software in the control unit "N116/5 - DC…
• 11019782Jun 28, 2025Lane departure, Forward collision avoidance, Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has updated driver assistance system SCN coding available for certain subject vehicles. The updated SCN coding improves system stability and enhances the availability of driver assistance features. MBUSA will conduct an OTA service campaign. Remote SCN coding updates are automatically downloaded and installed in the customer’s vehicle free of charge and…
• 11019747Jun 9, 2025Steering. Complaint Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position (e.g. with Easy Entry function), noise (breakaway noise) when leaving the limit stops of the height adjustment. Cause Height adjustment moves to the top/bottom limit stop and jams. 1. Driver seat control unit software 2.

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