2020 Mercedes-Benz CLS 450 Technical Service Bulletins

187 technical service bulletins (TSBs) are on record for the 2020 Mercedes-Benz CLS 450. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10205810Aug 3, 2021Equipment. The customer may note that the Dashcam feature is inoperable with one of the following complaints.
• 10205809Aug 2, 2021Equipment. The customer may note that the Dashcam feature is inoperable with one of the following complaints:
• 10199660Jul 8, 2021Engine cooling, Visibility (wipers, defrost, mirrors), Equipment. Coolant warning in instrument cluster - Leak in coolant line
• 10199654Jul 6, 2021Equipment. "Free browsing, Internet access via Wi-Fi hotspot and Internet radio nonfunctional"
• 10202531Jun 16, 2021Interior lighting. Touch pad: Search lighting does not dim or does not turn on.
• 10191289Mar 29, 2021Equipment. Message (yellow) in IC "Active Brake Assist currently restricted, see operator's manual, Remedy: Deactivate transport mode and drive vehicle for approx 6mi. The DTC then switches to passive and the sensor can be calibrated
• 10191256Mar 26, 2021Engine cooling. Mercedes-Benz AG (?MBAG?), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2020 C-Class (205) and GLE-Class (167) vehicles, the mixing ratio of coolant to antifreeze may not meet production specifications.
• 10191281Mar 12, 2021Suspension. Humming noises or vibrations from the area of the rear axle when maneuvering or moving off at traffic lights/intersections.
• 10189407Feb 24, 2021Equipment, Electrical system. In XENTRY diagnosis, the message "MBUX multimedia system control unit is defective (hard drive, internal fault)" appears while attempting to communicate with the MBUX multimedia system (A26/17)
• 10189406Feb 22, 2021Back-over prevention (rear camera). If the exhaust flap is operated or the drive program is changed within 10 seconds of the engine being started, an audible humming noise may emit from the speakers. New sound amp (N40/3) software is currently in development. This document will be updated once it is released. Meanwhile, avoid toggling the drive program or the exhaust flap with 10 seconds of an engine start to avoid the possibility of the complaint…
• 10189404Feb 19, 2021Electrical system. Complaint: Various causes are possible. The faults listed in the various causes do not all have to be present at all times. Some of these complaints may overlap. Rely on the faults listed in the Cause section for identifying the correct Remedy. 1. No start 2. Yellow or red instrument cluster message for 48 V on-board electrical system battery (G1/3) 3.
• 10187785Jan 4, 2021Other or unknown, Electrical system, Equipment. The following complaints may be noted by the customer: - The MBUX multimedia system (A26/17) starts route guidance without user input and does not provide any audio notification. - The MBUX multimedia system (A26/17) does not give any spoken or visual driving instructions. Only the destination information and the current route are shown in the MBUX multimedia system (A26/17)
• 10186148Dec 30, 2020Visibility (wipers, defrost, mirrors). Air Conditioning Intermittently Does Not Cool
• 10186140Dec 17, 2020Electrical system. Functional impairment of 48 V on-board electrical system
• 10186154Dec 11, 2020Electrical system. Mercedes-Benz AG (?MBAG?), the manufacturer of Mercedes-Benz, has determined that on certain Model Year (?MY?) 2019-2020 CLS-Class, E-Class, and GLE-Class (167, 213, 238, and 257 Platform) vehicles, the software for the on-board electrical system battery control unit does not correspond to the current series production configuration.
• 10186141Dec 10, 2020Electrical system. NTG5.5: Incorrect time shown on instrument cluster, COMAND display, and analog clock
• 10186135Dec 9, 2020Brakes, Electronic stability control. If the customer brakes sharply from a speed of > 30mph, without ABS intervention, there is a single cracking noise from the area of the ESP hydraulic unit
• 10181128Sep 16, 2020Steering. Cracking/Creaking Noises Coming From The Area Of The Mechanical Steering Column
• 10179956Aug 10, 2020Electrical system. Xentry Battery Tester results disagree with workshop assessment
• 10179966Jul 31, 2020Equipment, Other or unknown. Incorrect time and/or instrument cluster message "SOS, service not activated" and/or Mercedes Me connect services nonfunctional
• 10178732Jul 20, 2020Equipment. Air Conditioning Intermittently Does Not Cool
• 10178744Jul 17, 2020Equipment. The operator's manual for the above vehicles does not comply with current specifications. "Daimler AG" may be documented as the manufacturer in the operator's manual. The new manufacturer is "Mercedes-Benz AG." We thus ask that you place the supplementary booklet into the vehicle. The work required for this purpose can be found in the attached work description.
• 10178712Jul 2, 2020Fuel system, Other or unknown. Message in the Instrument Cluster "Refill 1L Oil at the Next Fuel Stop"
• 10178711Jul 1, 2020Electrical system, Fuel system, Other or unknown. Message in the Instrument Cluster "Refill 1L Oil at the Next Fuel Stop"
• 10178715Jun 30, 2020Exterior lighting. Headlamps fogged
• 10177570Jun 30, 2020Equipment, Body and structure, Visibility (wipers, defrost, mirrors). Wind noises in area of mirror triangle at front doors as of 120 km/h (75 MPH). Possible noise due to minimal thickness of sealing rail. Replace sealing railing and adjust side windows.
• 10177565Jun 25, 2020Equipment. The mobile phone address book is not transferred completely to the multimedia system (COMAND or MBUX). In some cases, the call list shows just the telephone numbers but no names. The problem only occurs in conjunction with the iPhone and software version iOS 13.x.
• 10177561Jun 18, 2020Electrical system, Transmission and drivetrain, Engine, Equipment. The check engine indicator light in the instrument cluster may be illuminated with one of the following fault codes: P261029, P02FF85, or P02FF02 stored in the engine control unit (N3/10). The time in instrument cluster is implausible due to an internal reset.
• 10177555Jun 16, 2020Equipment, Seats. When the dynamic seat is activated, the tensioning straps on the seat backrest frame may creak. The tensioning straps are in contact with the seat backrest frame and as a result, a creaking noise may occur. Apply lubricant (Krytox) between the tensioning strap and the seat backrest frame.
• 10176663May 19, 2020Engine. Check engine indicator light active and fault code P261029/P02FF85/P02FF02 stored in engine control unit
• 10172683Feb 7, 2020Tires, Equipment. Information Label on Tire Sealant
• 10171655Jan 28, 2020Electrical system. Functional impairment of 48 V on-board electrical system
• 10171637Jan 14, 2020Body and structure, Interior lighting. Retrofitted front door exit lamps with logo projection flicker
• 10171635Jan 13, 2020Equipment. NTG5.5, NTG6: Vehicle positioning inaccurate / implausible, route guidance not possible
• 10169586Nov 14, 2019Equipment. EASY-Pack liftgate does not fully open
• 10205156Aug 26, 2016Transmission and drivetrain, Other or unknown. Intial startup not possible after replacement of transmisson 725.0 or of electrohydraulic controller unit.
• 10205154Aug 5, 2016Engine cooling, Other or unknown. Gasket may settle causing a slight oil leak.

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