Problems owners report
Complaints filed with NHTSA about the 2023 Mercedes-Benz GLC 300, by the system named in each complaint. One complaint can name several.
- Electrical system30
- Engine15
- Exterior lighting10
- Unknown or other8
- Forward collision avoidance7
- Lane departure6
- Service brakes5
- Fuel/propulsion system5
- Structure4
- Power train3
NHTSA ODI complaints (public domain) · updated 23 Oct 2026 · 2 injuries and 1 deaths reported
Compared with other years
NHTSA ODI complaints by model year
Recalls
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2020-2021 CLA, 2019-2022 A-Class, 2022-2023 C-Class, 2024 CLE, 2020-2026 GLA/GLB, and 2023-2024 GLC vehicles. Please refer to MBUSA's recall report for specific model information. The micro-switch in the driver's door lock may corrode and fail to detect an open door, preventing the electronic parking brake or "Auto-Park" feature from engaging automatically. This may result in a vehicle rollaway.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023-2026 EQE and GLC vehicles. Please see the recall report for a complete list of models. The steering coupling bolt may have been improperly tightened, allowing the steering coupling to loosen from the steering rack.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023 GLC 300 and GLC 300 4MATIC vehicles. The headlights are missing adjustment prevention caps, which can allow the headlights to be improperly adjusted. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023-2025 GLC 300, GLC 300 4MATIC, 2024-2025 AMG GLC 43 4MATIC, 2025 GLC 350E 4MATIC, and AMG GLC 63 S E vehicles equipped with a panoramic sunroof. In certain crash scenarios, where the rear occupant's head contacts the C-pillar, the pillar may not absorb an adequate amount of the impact. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 201, "Occupant Protection in Interior Impact."
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023-2024 C-Class, E-Class, S-Class, SL, GLC, EQE SUV, EQE, EQS SUV, and EQS vehicles that were incorrectly repaired under recall 24V-115. An incorrect fuse box that was not designed for the vehicle may have been installed.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023 GLC 300 and GLC 300 4MATIC vehicles. The driver's and front passenger seat rail may have been incorrectly attached to the vehicle body.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023 GLC 300 4MATIC vehicles. Certain dashboard area bolts may have been insufficiently tightened, potentially causing improper air bag deployment or parts separation during a crash. In addition, the 12-Volt electric auxiliary heater connections may be loose, possibly causing the electrical wiring to overheat.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023-2024 C300, AMG C43, S580e, S580, Maybach S580, Maybach S680, AMG SL43, AMGSL63, GLC300, EQE350, EQE500, EQS450, EQS580, AMG EQS, 2023 S500, AMG SL55, AMG EQE, 2024 E350, E450, AMG C63e S, CLE300 Coupe, CLE450 Coupe, and GLC300 Coupe vehicles. The 80-Amp fuses may have been manufactured incorrectly, which can cause the fuses to fail.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2024 GLE, GLS, C-Class, E-Class, S-Class, SL, GLC, CLS, AMG GT, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle details. The fuel pump may shutdown, causing a loss of drive power.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023 GLC300, 2024 GLE350, and GLE450 vehicles equipped with an M254 engine. The incorrect screws, installed on the high-pressure fuel pump, may prevent a proper seal from forming between the high-pressure fuel pump and the tandem oil pump.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2023 GLC300 vehicles. The front tow eye may be inadequately threaded to the crossmember and can detach during towing.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2023 C-Class, E-Class, S-Class, CLS, SL, GT, GLC, GLE, GLS, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle details. The fuel pump may shutdown, which can result in a loss of drive power.
Whether a recall was fixed on a particular car is known only to the manufacturer: check the VIN at nhtsa.gov/recalls.
NHTSA recalls · summaries in NHTSA's own words
Service bulletins
What Mercedes-Benz told its dealers about the 2023 Mercedes-Benz GLC 300: known faults, fixes and updates.
| Bulletin | Summary |
|---|---|
| 11010970 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY21-25 C-Class, CLA, EQB, EQE, EQS, G-Class, GLA, GLB, GLC, GLE, GLS, GT, S-Class, and SL (206, 118, 243, 294, 296, 465, 247, 254, 167, 192, 223, and 232 platform) vehicles, the MBUX multimedia system does not correspond with the latest series production configuration. The MBUX multimedia 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 customers vehicle free of charge and do n |
| 11010907 | Complaint The flap of the reversing camera opens and closes by itself during forward travel. This happens several times during the trip. The customer notices the sound of opening and closing. No camera image is displayed in the head unit. The reversing camera or the 360 system functions normally when activated manually or by engaging drive range "R". This behavior occurs again during each driving cycle. Cause This is not a malfunction, but an intended system behavior: Calibration of the reversing camera is in progress. For this, the cover on the camera is opened for max. 5 cumulative minutes i |
| 11010818 | Complaint Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick test and/or no communication possible with VGS. Cause Transmission control unit Y3/8n4 Remedy It is important that LI54.15-P-057373 is processed before replacing any component parts (transmission 722.9). After processing and complying with the above documents, perform a reset on the transmission control unit Y3/8n4 (VGS) (ignition reset), check that the transmission connector is seated correctly and inspect the PINs for concerns. If communication with the VGS cannot be established |
| 11010755 | 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 |
| 11010648 | 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) |
| 11010494 | 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 ve |
| 11010455 | 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 |
| 11010450 | 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) |
| 11010435 | 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 ve |
| 11009138 | 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) |
| 11009122 | 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 l |
| 11009036 | 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. |
| 11008977 | 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. |
| 11008885 | 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. |
| 11008883 | 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 rem |
| 11008879 | 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 |
| 11008877 | Complaint Sliding sunroof panel of panoramic sliding sunroof reverses (temporarily, once, multiple times) during closing process without entrapment event: a) from tilt position b) from sliding position Cause a) Sensitive parameterization of the automatic reversing function of the panoramic roof b) Sluggish operation through tolerances of various component parts in the roof mechanism, in particular, at higher temperatures Remedy a) Leave the sliding sunroof panel of the panoramic roof in the rear sliding position (fully open position) for at least 30 minutes (or overnight if necessary), then pe |
| 11008712 | 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 connecti |
| 11008093 | Complaint After clicking on the "Radio" selection function, the radio does not start and instead a permanent loading wheel is displayed. See attached picture for example. Cause Software version Remedy A26/17 - MBUX multimedia system (Head unit) unit must be replaced. When the head unit is in this condition, a software update will not remedy the situation. NOTE: The information contained in this document is intended for use by trained, professional technicians with the knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz approved tools a |
| 11008091 | Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party during a call. It becomes increasingly difficult to understand as the speed rises. Cause A. Seating of the microphones in the headliner. Side edges are covered by the textile cover (see picture "1") B. Assembly of microphones (B25/20 or B25/21) in the headliner. C. Dirt inside the microphone housing Remedy 1. Press finger on rear of microphone (on adhesive tape) 2. Remove microphone cap from the front 3. Eliminate protrudin |
| 11008072 | Complaint White plastic insert present on microphone assembly. See figure A for example. Cause The insert (breathable filter) is designed to be inside for dust protection and air flow control. Remedy Do not remove the breathable filter from the microphone assembly. This part is designed to be in the microphone and should remain in the vehicle. Note: If TIPS support is required for microphone symptoms please open a TIPS case and reference this LI. |
| 11008065 | Cause The following conditions can occur on vehicles with a disconnected on-board electrical system battery 12V/48V): The period in which the on-board electrical system battery is disconnected cannot be counted by the maintenance computer. As soon as the on-board electrical system battery is connected again, the maintenance computer automatically starts counting without making a correction to the remaining time (days to next due service). Remedy Allowance must be made for vehicles with disconnected on-board electrical system battery. The following process must be complied with to achieve a c |
| 11008056 | Complaint Check engine light on. Fault code P207273 - "Throttle actuator valve is blocked due to ice" stored. Engine may crank and not start. Fault code P210185 may also be stored. Cause Moisture freezing on throttle actuator during extreme low ambient temperatures. Remedy Update software of engine control module. Software increases throttle valve flapping after engine turned off to prevent moisture buildup. |
| 11007974 | Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic conditions. In contrast to a leaky headlamp, physical fogging does not result in a technical impairment of the headlamp. A leak test must be performed to determine if physical fogging exists or if the headlamp is leaky. Remedy In advance, observe LI82.10-P-078301 "Headlamps or Front Fog Lamps Leaking or Fogged". 1. Prepare headlamp/check for external damage: For headlamps with a closed system 1. Check the headlamps for any external damage and check also for cor |
| 11007972 | Complaint After clicking on the "Radio" selection function, the radio does not start and instead a permanent loading wheel is displayed. See attached picture for example. Cause Software version Remedy A26/17 - MBUX multimedia system (Head unit) unit must be replaced. When the head unit is in this condition, a software update will not remedy the situation. |
NHTSA manufacturer communications (public domain)
NHTSA investigations
Malfunction Indicator Light / No-Start
NHTSA Office of Defects Investigation