2019 Mercedes-Benz GLS 450 technical service bulletins
126 technical service bulletins and manufacturer communications cover the 2019 Mercedes-Benz GLS 450, 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...
- Visibility/wiper
- Sporadic warning message in instrument cluster "Engine oil pressure, stop switch off vehicle" (or similar)...
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic /9G‑TRONIC automatic...
- Noises in the steering column area when steering
- 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
- 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...
- 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...
- 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,...
- The part numbers listed in the chart below should no longer be installed, and any existing stock must be...
- Noises at the front axle when cornering or maneuvering (video files attached) Note: Save video files...
- Headlamp, front fog lamp leaky or fogged
- Headlamp, front fog lamp leaky or fogged
- 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active...
- Headlamps leaking or fogged
- Engine
- Check engine light on with the following fault is current in the VGS Control Unit: P084300 Oil pressure...
- (Original LI document #: LI27.35-P-079039) Clicking noises from the electro-hydraulic control unit (EHS)...
- Possible complaints about shift quality, issues with learning the park lock, and slipping/rinse entries in...
- Electrical system
- MBUX head unit display with red text box "System Inoperative". ONLY for vehicles with SA code (549+21U) or...
- In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
- After a software update of HERMES communication module N112/9 has been performed on a gray import vehicle,...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- Please note that the exact quick test conditions must be met as seen below
- Headlamp, front fog lamp leaky or fogged
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- A clicking/ticking/taping noise from underneath the vehicle with engine off during ECO stop event or after...
- During a phone call, the called party has difficulty understanding/cannot understand the driver, or...
- Check engine light illuminated Fault code present in MRG3 control unit P22C800 or P22C900
- 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...
- Noises/ squealing from the service brake in various driving situations and ambient conditions
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements
- Fuel door may require several attempts to open
- If TRANSMISSION 725.1 (9G TRONIC FACELIFT) exhibits any "shift quality" problem symptoms, various...
- 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)
- Low engine oil level warning
- Check engine light illuminated Fault code present in MRG3 control unit P22C900
- The flap of the reversing camera opens and closes by itself during forward travel
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements
- After a control unit replacement of "N112/9
- Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick...
- Engine cooling fan running for an extended time after switching off vehicle
- Only vehicles with a variable transfer case are affected
- Washer fluid system leaks
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements
- 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
- • Head-up display permanently or sporadically unavailable
- Customer concern of Air Conditioning not cooling
- Yellow coolant warning system message appears in instrument cluster
- Rear lamps fogged up/not leaktight
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G-TRONIC automatic...
- In our continuing efforts to assure the proper performance of Mercedes-Benz products and to enhance the...
- 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
- Electrical system
- Electrical system
- Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats...
- Electrical system
- The "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle
- Electrical system
- Engine and engine cooling
- Tailgate opens unintentionally
- This LI does Not apply to 223 or 206 which use a different generation of 48V systems
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Metallic noises from area of instrument panel
- Customer states after a bus sleep the SiriusXM category changes from "My Favorites" to "All...
- Cause Communication fault between electrohydraulic suspension component parts through out-of-date software...
- • Seats cannot be adjusted • Seats cannot be folded • Seats in the 2nd seat row cannot be locked or...
- MY15+ M278 and M157 Equipped Vehicles with Fault Code ""P023400 – Boost Pressure is Too High"" "
- Model series 167 noise on B/C/D pillars.
- Excessive resistance of door side windows when being raised/lowered, cracking and squeaking noises.
- Free browsing, Internet access via Wi-Fi hotspot and Internet radio nonfunctional"
- For plug in hybrid and electric variants: Complaints about the electric range
- 1. Noises in recovery mode with the vehicle stationary 2. Noises when driving in a straight line on rough...
- Warning display message for eSuspension, various causes and remedies listed.
- Creaking noise from fixed glass section of panoramic roof in area of rear passenger compartment grab handles
- Replace exhaust gas cleaning information label
- Information Label on Tire Sealant
- 167 GLS headlight low beam fault
- Outside mirror folding out/in nonfunctional
- Head-up display (HUD) code 463 ? lines on the display, display flickers
- Check right and left torsion bar linkage, replace if necessary
- G Facelift 2018: Knocking noises from rear area on rough roads
- Fault message "AIRMATIC" or "Active Curve System" in instrument cluster
- Ticking or pulsing noise from high-pressure pump and/or fuel injectors.
- Engine fan runs continuously, a/c inoperable or, engine light illuminates sporadically.
- Gasket may settle causing a slight oil leak.
- Minor leaks at the oil duct of the left or right cylinder head of engines 157, 276 and 278
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