2020 Mercedes-Benz CLS 450 technical service bulletins
187 technical service bulletins and manufacturer communications cover the 2020 Mercedes-Benz CLS 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...
- 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...
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Red coolant warning in instrument cluster
- 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
- 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...
- Hand detection system – malfunction / vehicles with code 266 Fault message in instrument cluster: "Active...
- Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
- 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...
- Headlamp, front fog lamp leaky or fogged
- Headlamp, front fog lamp leaky or fogged
- Yellow information message in driver display (instrument cluster): "Switch on motor to charge the 12V battery"
- This LI does Not apply to 223 or 206 which use a different generation of 48V systems
- Headlamps leaking or fogged
- Tailgate opens unintentionally
- Engine
- Check engine light on with the following fault is current in the VGS Control Unit: P084300 Oil pressure...
- Red ring displayed around vehicle when front or rear camera door actuates
- 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)...
- 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...
- Electrical system
- The result from the XENTRY battery test does not match the current state of the battery
- See Attachment
- 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
- After a software update of component LIB48_222
- Users report that the browser no longer supports search queries entered directly into the address bar
- No cooling output, compressor inoperative
- Electrical system
- Electrical system
- 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,...
- Electrical system
- Hand detection system not operating correctly / vehicles with code 266 Fault message in instrument...
- Headlamp, front fog lamp leaky or fogged
- 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...
- Check engine light illuminated Fault code present in MRG3 control unit P22C800 or P22C900
- Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault...
- Electrical system
- Electrical system
- Noises/ squealing from the service brake in various driving situations and ambient conditions
- 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
- Electrical system
- 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
- "Active Emergency Stop Assist Currently Unavailable" and "Active Steering Assist Inoperative" instrument...
- 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
- Rear lamps fogged up/not leaktight
- 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...
- This is to notify you of the Service Campaign OTA update for the MBUX system software in 750,313 Model...
- Tailgate opens unintentionally
- Electrical system: software
- 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...
- Electrical system
- The "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle
- Electrical system
- In the MBUX weather app, the temperature is displayed in the wrong unit (Fahrenheit instead of °C, or vice...
- Engine and engine cooling
- Loads induced at the steering wheel through pushing and pulling actions may
- The trunk lid is not latching into the closed position with the help of the trunk lid power closing...
- 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...
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- Customer states after a bus sleep the SiriusXM category changes from "My Favorites" to "All...
- Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position...
- The Apple Carplay interface cannot be controlled via the center console touchpad or the right-hand...
- Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz, has produced certain MY 2021-2022 A-Class,...
- The following complaints may be noted by the customer: • Upon selecting navigation, the central display...
- The touchpad dimming function does not work and the search lighting is either at maximum brightness or...
- 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
- Sporadic warning message in instrument cluster "Engine oil pressure stop switch off vehicle" (or similar)...
- The exhaust gas cleaning information label does not correspond to currently valid specifications
- 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
- Functional impairment of 48 V on-board electrical system "
- The mobile phone address book may not be transferred completely to the multimedia system COMAND, Audio 20,...
- The customer may note that the Dashcam feature is inoperable with one of the following complaints.
- If TRANSMISSION 725.1 9G TRONIC FACELIFT exhibits any "shift quality" concerns, vared diagnosis procedures...
- On vehicles with code 077 HERMES dummy module the following functions are restricted, unavailable.
- Intermittently after bus sleep the lower control panel LCP and upper control panel UCP may be panel UCP...
- The customer may note that the Dashcam feature is inoperable with one of the following complaints
- 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.
- Message (yellow) in IC "Active Brake Assist currently restricted, see operator's manual, Remedy:...
- Engine and engine cooling
- Humming noises or vibrations from the area of the rear axle when maneuvering or moving off at traffic...
- 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...
- Complaint: Various causes are possible
- The following complaints may be noted by the customer
- Air Conditioning Intermittently Does Not Cool
- Functional impairment of 48 V on-board electrical system
- Electrical system
- NTG5.5
- If the customer brakes sharply from a speed of > 30mph, without ABS intervention, there is a single...
- Cracking/Creaking Noises Coming From The Area Of The Mechanical Steering Column
- Xentry Battery Tester results disagree with workshop assessment
- Incorrect time and/or instrument cluster message "SOS, service not activated" and/or Mercedes Me connect...
- The operator's manual for the above vehicles does not comply with current specifications
- Message in the Instrument Cluster "Refill 1L Oil at the Next Fuel Stop"
- Wind noises in area of mirror triangle at front doors as of 120 km/h (75 MPH). Possible noise due to...
- Headlamps fogged
- The mobile phone address book is not transferred completely to the multimedia system (COMAND or MBUX). In...
- The check engine indicator light in the instrument cluster may be illuminated with one of the following...
- When the dynamic seat is activated, the tensioning straps on the seat backrest frame may creak
- Check engine indicator light active and fault code P261029/P02FF85/P02FF02 stored in engine control unit
- Information Label on Tire Sealant
- Retrofitted front door exit lamps with logo projection flicker
- NTG5.5, NTG6
- EASY-Pack liftgate does not fully open
- Intial startup not possible after replacement of transmisson 725.0 or of electrohydraulic controller unit.
- Gasket may settle causing a slight oil leak.
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