2020 Mercedes-Benz GLC 300 technical service bulletins
228 technical service bulletins and manufacturer communications cover the 2020 Mercedes-Benz GLC 300, including 4 warranty extensions.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz...
- Fuel/propulsion system
- In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
- In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic /9G‑TRONIC automatic...
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Only vehicles with a variable transfer case are affected
- Clanking noise from the area of the speakers in the doors
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G‑TRONIC automatic...
- During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time
- Tailgate opens unintentionally
- 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active...
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- This document is intended as a pre-case diagnostic reference for transmission related concerns
- Mercedes-Benz USA is currently experiencing limited availability of transmission fluid specification ATF...
- Engine
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements...
- Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed,...
- Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop...
- The customer requests deactivation of the N112/9 HERMES communication module Note: Deactivation of the...
- After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the...
- Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed,...
- There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper...
- The part numbers listed in the chart below should no longer be installed, and any existing stock must be...
- 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active...
- The panoramic sliding sunroof operates in a stepped movement
- Headlamp, front fog lamp leaky or fogged
- -Check engine light illuminated
- The "easy entry and exit feature" function deactivates itself after a brief period
- Customer concern for ESP/Brake or Steering yellow instrument cluster message AND C220564 in the N80...
- Headlamp, front fog lamp leaky or fogged
- Yellow information message in driver display (instrument cluster): "Switch on motor to charge the 12V battery"
- Headlamps leaking or fogged
- Unknown or other
- Check engine light on with the following fault is current in the VGS Control Unit: P084300 Oil pressure...
- The vehicle cannot disengage “P” (Park), and a red warning message appears in the instrument cluster
- Engine
- Engine
- Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz...
- The intent of
- Customer states the AC either does not cool/has poor performance or heat is insufficient
- Customer states the AC either does not cool/has poor performance or heat is insufficient
- (Original LI document #: LI27.35-P-079039) Clicking noises from the electro-hydraulic control unit (EHS)...
- The flap of the reversing camera opens and closes by itself during forward travel several times during the...
- The shift from 1st to 2nd gear may be uncomfortable under light load
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Possible complaints about shift quality, issues with learning the park lock, and slipping/rinse entries in...
- The result from the XENTRY battery test does not match the current state of the battery
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- After a software update from campaign 2025050001 of component LIB48_222
- Users report that the browser no longer supports search queries entered directly into the address bar
- Electrical system
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- MBUX head unit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or...
- The following most common complaints may be observed: • Brief connectivity interruptions when using Apple...
- In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
- Load compartment cover generates a creaking noise during driving when pulled out to covering position
- After a software update of HERMES communication module N112/9 has been performed on a gray import vehicle,...
- Headlamp, front fog lamp leaky or fogged
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- Instrument cluster message for rear turn signal lamp despite functioning rear lamp
- Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious
- Rear cross traffic activation without obvious
- A clicking/ticking/taping noise from underneath the vehicle with engine off during ECO stop event or after...
- MBUX headunit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or...
- Complaint
- Paint damage on door paneling in area of door handle (see picture 1).
- The message "Device detected at diagnostics connection See Owner’s Manual" appears sporadically in the...
- The luggage compartment lighting switches off and back on erratically if the tailgate is opened with the...
- Electrical system
- During a phone call, the called party has difficulty understanding/cannot understand the driver, or...
- The flap of the reversing camera opens and closes by itself during forward travel several times during the...
- Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault...
- Electrical system
- Electrical system
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements
- Noise from area of instrument panel Noise might occur in the following conditions
- Paint damage on door paneling in area of door handle (see picture 1).
- Fuel door may require several attempts to open
- Sliding sunroof panel of panoramic sliding sunroof reverses (temporarily, once, multiple times) during...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Customer states CEL is on. Cause Quick test shows FC P0A7F00 The state of health limit of the...
- After a software update, the MBUX multimedia system (A26/17) may incorrectly display the fault code...
- The flap of the reversing camera opens and closes by itself during forward travel
- After a control unit replacement of "N112/9
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- Rear lamps fogged up/not leaktight
- Only vehicles with a variable transfer case are affected
- Washer fluid system leaks
- Check engine light on. One of the below fault codes is current in the engine control module (N3/10)
- Check engine light on. Fault code P207273
- Headlamp or front fog lamp leaky or fogged
- To insure vehicle down time is kept at a minimum and all required information is available when case is...
- Headlamps fogged or droplets forming
- Yellow Coolant warning comes on in cluster Fault codes below are current or stored in MED41 P0A0500- The...
- Check engine light on and fault code P019185 current or stored in MED41 control unit
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G-TRONIC automatic...
- Noticeable vibrations at the steering wheel: • At speeds between 40mph and 75mph • On straight stretches...
- The driver's seat memory settings do not synchronize with the driver's user profile as described in the...
- This is to notify you of the Service Campaign OTA update for the MBUX system software in 750,313 Model...
- Tailgate opens unintentionally
- Always use the latest XENTRY Diagnosis software release with all available add-ons
- The radio station favorites list is no longer present after bus idle Saving process during download...
- Electrical system: software
- Electrical system
- The steering wheel generates grinding noises between the steering wheel and steering column switch module...
- Noises in the steering column area when steering
- In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the...
- Electrical system
- Electrical system
- Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats...
- Electrical system
- Wheezing noises from the front shock absorbers when passing over surface undulations and rough road
- The "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle
- Sliding sunroof panel of panoramic sliding sunroof reversed (temporarily, once, multiple times) during...
- In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the...
- Electrical system
- The Mercedes me connect services cannot be activated
- Visibility
- In the MBUX weather app, the temperature is displayed in the wrong unit (Fahrenheit instead of °C, or vice...
- Complaint
- Tailgate opens unintentionally
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Staining on door trim strips and top and bottom trim elements on rear side windows
- 1. Vibrations noticeable at steering wheel when front axle is excited when driving at a speed between 65...
- Staining on door trim strips and top and bottom trim elements on rear side windows
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Malfunction of the electric steering column adjustment
- Customer states after a bus sleep the SiriusXM category changes from "My Favorites" to "All...
- In an initial quick test, DTC B238A00 "Fan 2 of the control unit has malfunctioned" may be active...
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Thumping noise on rear axle shock absorber on rough road
- Electrical system
- 1. Vibrations noticeable in steering wheel when front axle is excited while driving at a speed above 40...
- Fault message (yellow) in instrument cluster and TPM warning lamp
- The following complaints may be noted by the customer: • Upon selecting navigation, the central display...
- The garage door hand transmitter cannot be initialized with the integrated garage door opener in the...
- The range of the integrated garage door opener (GTO) is too short
- Seat heating on driver's seat and front passenger seat nonfunctional
- MY15+ M278 and M157 Equipped Vehicles with Fault Code ""P023400 – Boost Pressure is Too High"" "
- MBUX multimedia system: Map data does not match with your system/the navigation system cannot be activated
- Upon selecting navigation, the central display may show the following message: "Map data does not match...
- The mobile phone address book may not be transferred completely to the multimedia system COMAND, Audio 20,...
- On vehicles with code 077 HERMES dummy module the following functions are restricted, unavailable.
- Fuel filler flap opens slowly/switch flashes/tank is bleeding instrument cluster warning
- The customer may note that the Dashcam feature is inoperable with one of the following complaints.
- The customer may note that the Dashcam feature is inoperable with one of the following complaints
- Launch EW NCU
- Coolant warning in instrument cluster
- Free browsing, Internet access via Wi-Fi hotspot and Internet radio nonfunctional"
- Vehicle does not start after charging process
- Remote start causing CEL and U012600.
- For plug in hybrid and electric variants: Complaints about the electric range
- With engine M17x the ME Control Unit: "The Coolant Temperature is Below the Specified Temperature"
- Message (yellow) in IC "Active Brake Assist currently restricted, see operator's manual, Remedy:...
- Engine switches off again when re-attempting Remote Start via Mercedes me App. This only occurs if the...
- Steering wheel heater and/or Distronic cannot be activated
- After ignition ON, the following message is shown on the instrument cluster
- Fault in 12 V interlock circuit
- When accelerating at low speeds (slow roll at < 9 mph, 2nd gear), the engine limp-home mode may be...
- In XENTRY diagnosis, the message "MBUX multimedia system control unit is defective (hard drive, internal...
- If the exhaust flap is operated or the drive program is changed within 10 seconds of the engine being...
- The customer complains that when the ignition is switched on, pulsating buzzing noises which fluctuate in...
- The following complaints may be noted by the customer
- Vehicle interior whistling noises (also stationary)/high cabin interior pressure
- Replace automatic transmission
- Cracking/Creaking Noises Coming From The Area Of The Mechanical Steering Column
- Electrical system: software
- Xentry Battery Tester results disagree with workshop assessment
- Mobile phone Apple iPhone 11/11Pro/11ProMax/SE 2020: The Bluetooth connection between the MBUX multimedia...
- Steering wheel heater and/or Distronic function limited
- Incorrect time and/or instrument cluster message "SOS, service not activated" and/or Mercedes Me connect...
- MBUX multimedia system: "Favorites" and "Recent destinations" not available
- In XENTRY diagnosis, the message "MBUX multimedia system control unit is defective (hard drive, internal...
- The mobile phone address book is not transferred completely to the multimedia system (COMAND or MBUX). In...
- During a phone call, the Bluetooth connection between the MBUX multimedia system (A26/17) and a paired...
- The check engine indicator light in the instrument cluster may be illuminated with one of the following...
- Fault code B223209 is logged as "stored" in the parking control unit.
- Fault code B223209 is logged in the parking control unit
- Check engine indicator light active and fault code P261029/P02FF85/P02FF02 stored in engine control unit
- Information Label on Tire Sealant
- Audible fan noise from area of center console
- MBUX multimedia system: Mercedes-Benz service stations not available in Navigation menu
- EASY-Pack liftgate does not fully open
- Assessment of actuating and operating noise from steering
- Navigation system permanently displays "Activating".
- Reset the customer-specific data and perform a software update of the AUDIO20 control unit.
- Traffic information service and posibly the voice control, nonfunctional after navigation software update.
- Cd/dvd
- High voltage battery warning message in instrument cluster.
- Gasket may settle causing a slight oil leak.
- Operation complaints for LED headlamps.
- Noises when opening and closing automatic liftgate.
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