2020 Mercedes-Benz S 450 technical service bulletins
138 technical service bulletins and manufacturer communications cover the 2020 Mercedes-Benz S 450, including 3 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...
- 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
- 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,...
- 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...
- Headlamp, front fog lamp leaky or fogged
- Headlamp, front fog lamp leaky or fogged
- Engine
- Headlamps leaking or fogged
- 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...
- 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...
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- 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,...
- Headlamp, front fog lamp leaky or fogged
- A popup is seen on the HU with the message "data connection temporarily not available". Potentially...
- The last settings for the Augmented Reality Head-up Display (AR HUD) may not always be saved and the...
- Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious
- A clicking/ticking/taping noise from underneath the vehicle with engine off during ECO stop event or after...
- The message "Device detected at diagnostics connection See Owner’s Manual" appears sporadically in 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...
- Electrical system
- Electrical system
- Electrical system
- Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements
- Fuel door may require several attempts to open
- 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)
- 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...
- Rear lamps fogged up/not leaktight
- Only vehicles with a variable transfer case are affected
- Washer fluid system leaks
- Fuel/propulsion system
- Tension-releasing impact of the propeller shaft with the force-free in D "KID" function, after vehicle has...
- 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
- Customer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G-TRONIC automatic...
- Tailgate opens unintentionally
- 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
- Electrical system
- Electrical system
- Electrical system
- Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats...
- Mercedes me connect services inoperative (me-Call, Remote Status, etc.). Mercedes me services
- The "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle
- Electrical system
- The Mercedes me connect services cannot be activated
- Engine and engine cooling
- Suspension
- Update Digital Operator's Manual and enclose printed Operator's Manual, replace if necessary Model 223
- Engine and engine cooling
- Tailgate opens unintentionally
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Fuel system, gasoline
- Creaking noise from side bolster when load applied to seat cushion of front seats
- 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
- MY15+ M278 and M157 Equipped Vehicles with Fault Code ""P023400 – Boost Pressure is Too High"" "
- The mobile phone address book may not be transferred completely to the multimedia system COMAND, Audio 20,...
- Fuel filler flap opens slowly/switch flashes/tank is bleeding instrument cluster warning
- Coolant warning in instrument cluster
- Free browsing, Internet access via Wi-Fi hotspot and Internet radio nonfunctional"
- Touch pad: Search lighting does not dim or does not turn on.
- 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
- AIR BODY (AIRMATIC) display message
- Complaint: Height adjustment of electric steering column adjustment jams in upper / lower adjustment...
- Power train
- Air Conditioning Intermittently Does Not Cool
- Replace automatic transmission
- Harsh engagement when changing gear range from P to D or R
- Shifting complaints and transmission fault codes in vehicles with transmission 725.0
- Xentry Battery Tester results disagree with workshop assessment
- Incorrect time and/or instrument cluster message "SOS, service not activated" and/or Mercedes Me connect...
- Lamp unit fogged or droplets forming
- The mobile phone address book is not transferred completely to the multimedia system (COMAND or MBUX). In...
- The software for the transmission control unit on the above model series vehicles transferred to you does...
- The check engine indicator light in the instrument cluster may be illuminated with one of the following...
- Check engine indicator light active and fault code P261029/P02FF85/P02FF02 stored in engine control unit
- 5 to 4 coasting downshift
- Navigation system permanently displays "Activating".
- High voltage battery warning message in instrument cluster.
- Gasket may settle causing a slight oil leak.
- Trunk lid closes too quickly.
- Mobile phone cotacts are not transferred completely.
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