2023 Mercedes-Benz EQS 450 Technical Service Bulletins

269 technical service bulletins (TSBs) are on record for the 2023 Mercedes-Benz EQS 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.

• 11030300Mar 23, 2026Body and structure, Electrical system. Complaint Depending on the identified problem (items 1-4), please implement the corresponding Remedy below (items 1-4): 1. KeylessGo sensor surfaces do not respond. Door handles can extend/retract if the key is used for locking/unlocking. No particular fault code. 2. Surface-flush door handle fails to retract and/or extend.
• 11030159Mar 19, 2026Electrical system. Complaint Mercedes me connect services inoperative (me-Call, Remote Status, etc.). Mercedes me services - activation not possible Notes: - The event code "B16AC00 - The configuration of the SIM card is erroneous" is active and stored - The head unit shows no internet connection Cause The RAMSES module may be faulty. This fault profile can be recognized as follows: With XENTRY Diagnosis, enter the "ACTUAL values"…
• 11030157Mar 19, 2026Electrical system. Complaint Mercedes me connect services inoperative (me-Call, Remote Status, etc.). Mercedes me services - activation not possible Notes: - The event code "B129C00 - Malfunction in control unit for telematics services" is active and stored - The head unit shows no internet connection Cause Under analysis. Remedy Please create a TIPS case, attach a RAMSES control unit log to the case.
• 11030070Mar 14, 2026Electrical system. Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the software for the DC charge-connection unit (DCCU) control unit does not correspond to current production specifications. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update software of DCCU control unit. This software update will enable compatibility with Plug…
• 11030093Mar 12, 2026Transmission and drivetrain, Visibility (wipers, defrost, mirrors). Complaint Yellow instrument cluster message: "Cooling system fault, operating energy input reduced, service required" Cause Fault code "B3A0077 - The regulation valve in the refrigerant circuit for the battery cooling gets stuck open. The ordered position cannot be achieved" stored. Faulty expansion valve component part Y140/1 Remedy Check the part number of Y140/1. If the vehicle has A 297 830 79 03 or older…
• 11030089Mar 11, 2026Electrical system. Complaint The vehicle's position on the map is displayed far away from its actual position, e.g. the vehicle is displayed as being in the middle of the ocean. Note: No relevant DTC is displayed during the quick test. Cause The GNSS antenna is not correctly inserted at the GNSS connection (see picture in the attachment) in the head unit (A26/17). Remedy Insert the plug into the GNSS connection and ensure that the…
• 11030088Mar 9, 2026Electrical system. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.
• 11029961Mar 9, 2026Electrical system, Seats. Complaint The seat may no longer be adjustable using the electric seat adjustment switch on the door module. No related error is stored in the quick test. Cause Under certain conditions, the electric seat adjustment switch may remain in sleep mode. It is then not possible to adjust the seat using this switch. This is a software error. Remedy To restore functionality, perform the following steps: 1. Remove the door…
• 11029959Mar 9, 2026Exterior lighting. Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1.
• 11029927Mar 4, 2026Electrical system. Complaint Yellow information message in driver display (instrument cluster): "Switch on motor to charge the 12V battery" Cause The state of charge (SOC) of the 12V battery has dropped to 45% or less. Remedy This warning message appears as soon as the state of charge (SOC) of the 12V primary battery drops below 45%. This message is displayed to safeguard the vehicle's starting ability.
• 11029919Mar 2, 2026Steering. Complaint Noises from the area of the steering column. - Creaking - Squeaking - Chattering - Humming - Grinding Cause At present, there are no known noise problems with the steering column. Remedy Check surrounding area of the steering column for possible noises. • Instrument panel support • Steering column switch module If noise only occurs when adjusting the steering column via electric actuation please perform…
• 11029094Feb 28, 2026Electrical system. Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("- -"). • Flashing when current vehicle speed is under speed limit. • Flashing between US speed limit symbol and European speed limit symbol. Cause There are two identified reasons for this concern: 1. Country code information…
• 11029093Feb 28, 2026Electrical system. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.
• 11029091Feb 28, 2026Steering. Complaint Stored DTC C220564 - "There is an internal fault in the steering angle sensor. There is an implausible signal." In the quick test, there are also no other DTC's in other control units that point to or reference N80 Steering Column Control Module ("SCCM"). There is no effect on any other components or vehicle functions and it does not cause an instrument cluster light. Cause The DTC only ever occurs during…
• 11029056Feb 28, 2026Air bags, Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the SRS control unit software does not correspond to current production specifications. The SRS control unit will be updated to improve vehicle charging functionality during future over-the-air updates. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the SRS control…
• 11029090Feb 27, 2026Body and structure. Complaint Please perform the corresponding remedy measures (points 1-4) depending on the determined problem (points 1-4): 1. KeylessGo sensor surfaces do not respond. Door handles can extend/retract if unlocked/locked using the key. No particular fault code. 2. Flush-fitting door handle does not extend and/or retract.
• 11029083Feb 25, 2026Body and structure, Electrical system. Complaint Tailgate opens unintentionally. Cause Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. E.g. when stored in trouser pocket, handbag etc. Remedy As of the 6th generation, the vehicle key can be recoded so that the tailgate no longer opens as a result of a long press on the button, but by double-clicking on the button instead. This reduces the likelihood of the button…
• 11029025Feb 24, 2026Exterior lighting. Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical impairment of the headlamp. If a pressure compensation diaphragm is fitted in the housing cover, then the lamp unit is a "closed system". Remedy Headlamp: Remedy 1 Clearing fogged/condensed LED headlamps: 1.
• 11028806Feb 14, 2026Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the software for various eDrive components does not correspond with the latest series production configuration. The subject vehicles will receive an update to optimize communication with the vehicle public charging stations and improve the use of Plug & Charge. MBUSA will conduct an OTA service campaign.
• 11028816Feb 13, 2026Electrical system. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.
• 11028640Feb 6, 2026Electrical system. Complaint Activating Navigation Please Wait" message seen on central display. Cause Under Analysis Remedy 1.Reset the MBUX language (e.g., if the MBUX language is set to English, please change it to any other language and then set it back to English again) 2.If the issue still persists after the step 1, Perform a user data reset of the Head Unit. If the above 2 steps still don't repair the issue, please open a TIPS…
• 11028532Feb 3, 2026Electrical system. Complaint Red ring displayed around vehicle when front or rear camera door actuates. Please also see LI54.65-P-080132 for additional listed red ring causes. Cause EMF interference. Remedy Camera functionality is not affected. Cameras and displays operate normally. For vehicles with a front facing actuating camera and flap (223 and 297): • 223, 297 > Install clip on ferrite magnet on M35/1, pin 3.
• 11027904Jan 30, 2026Electrical system, Back-over prevention (rear camera). Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.
• 11027820Jan 26, 2026Electrical system. Complaint The vehicle's position on the map is displayed far away from its actual position, e.g. the vehicle is displayed as being in the middle of the ocean. Note: No relevant DTC is displayed during the quick test. Cause The GNSS antenna is not correctly inserted at the GNSS connection (see picture in the attachment) in the head unit (A26/17). Remedy Insert the plug into the GNSS connection and ensure that the…
• 11027796Jan 23, 2026Steering. Complaint Noises from the area of the steering column. - Creaking - Squeaking - Chattering - Humming - Grinding Cause At present, there are no known noise problems with the steering column. Remedy Check surrounding area of the steering column for possible noises. • Instrument panel support • Steering column switch module If noise only occurs when adjusting the steering column via electric actuation please perform…
• 11027782Jan 21, 2026Other or unknown. Complaint The intent of this document is to provide workshops with helpful technical reference language. • Commonly used acronyms in LI's and TIPS cases. • Control unit names, numbers, and how to identify. • Network/wiring architecture groups to baumuster quick reference. • Platform to baumuster quick reference.
• 11027751Jan 16, 2026Visibility (wipers, defrost, mirrors). Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy *Note - This Li does not apply if there are other Li's that apply to your concern OR you have a fault and/or guided test that leads to a root cause. AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle…
• 11027682Jan 15, 2026Visibility (wipers, defrost, mirrors). Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and…
• 11027566Jan 7, 2026Visibility (wipers, defrost, mirrors). Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and…
• 11027141Dec 19, 2025Electrical system. In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty coverage for the HV AC Compressor on your vehicle from the original New Vehicle Limited Warranty of 4 years/ 50,000 miles to 8 years/ unlimited miles (whichever occurs first). This applies to the vehicle regardless of ownership.
• 11026594Dec 13, 2025Electrical system. Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the software for the DC charge-connection unit (DCCU) control unit does not correspond to the current production specifications. This software update will enable the compatibility with Plug & Charge functionality on the Tesla Supercharger network. MBUSA will conduct a service campaign. An authorized…
• 11026611Dec 11, 2025Electrical system. Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.
• 11026608Dec 11, 2025Electrical system. Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("- -"). • Flashing when current vehicle speed is under speed limit. • Flashing between US speed limit symbol and European speed limit symbol. Cause There are two identified reasons for this concern: 1. Country code information…
• 11026381Dec 5, 2025Electrical system. In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA, LLC is extending the warranty coverage on the High Voltage (HV) AC Compressor in certain Model Year (MY) vehicles listed below from the original New Vehicle Limited Warranty of 4 years/50,000 miles to 8 years/unlimited miles, whichever occurs first, relating to…
• 11025544Nov 6, 2025Electrical system. Complaint USB port not functioning properly. Cause Most reported USB port issues are due to improper use or contamination. Note: Any repair costs must be discussed with the customer beforehand. Common external factors identified include: • Fluid intrusion • Broken bushings or physical damage See attachments. Remedy If a component needs replacement without visible external damage, submit a detailed TIPS case.
• 11024516Oct 27, 2025Engine. Complaint Yellow instrument cluster message: "Cooling system fault, operating energy input reduced, service required". Cause Fault code "B3A0077 - The regulation valve in the refrigerant circuit for the battery cooling gets stuck open. The ordered position cannot be achieved" stored. Faulty expansion valve component part Y140/1 Remedy Check the part number of Y140/1. If the vehicle has A 297 830 79 03 or older…
• 11024405Oct 20, 2025Brakes. Complaint At low speeds and light brake pressure, brakes will make a groaning or honking noise. Cause Frictional vibrations with very light brake pressure/modulations. Remedy This condition can be duplicated on most vehicles. To validate, use a like for like reference vehicle. The noise is normal behavior under the conditions listed. With very light brake pressure this noise can be induced/caused due to normal…
• 11024358Oct 14, 2025Wheels, Suspension. Complaint Crackling and cracking noise from the outer wheel on the front axle when cornering Cause The noise is generated by a micromovement on the contact surface between the rim and the brake disk (wheel bolt group) and may be intensified by potential soiling. The more lightweight rim (AMG forged rim) transmits the noise louder; in the case of cast rims, the noise is generally not perceptible. This is not a…
• 11024276Oct 10, 2025Seats. Complaint The "Easy entry and exit feature" function deactivates itself after a brief period. (see attachment). Cause The cause is currently being investigated. Remedy Update the HU7 to the latest software version, then perform a factory reset of the HU7. Steps to perform factory reset: Navigate to Settings > System > Reset > Reset to factory settings and confirm.
• 11024274Oct 10, 2025Electrical system. Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary, create a TIPS case with an informative video as an attachment.
• 11023347Sep 25, 2025Electrical system. Complaint The result from the XENTRY battery test does not match the current state of the battery. Cause The XENTRY battery tester uses the stored on-board electrical system data in the SAM module to access the health of the 12 volt battery. The XENTRY battery test may not take into account a single discharge event because the SAM or EZS cannot record the data if the battery is discharged. Note: A discharged…
• 11023192Sep 16, 2025Electrical system. Complaint The OTA software update prepares the SRS/ORC controller and enables it to be updated remotely in the future. Based on technician feedback, the OTA (code: 25P5496529) does not start even after an extended period of time and several driving cycles. In addition, the "Continue" button is grayed out. Cause The exact cause for the OTA not to start is currently under analysis.
• 11023033Sep 8, 2025Electrical system. Complaint The OTA software update prepares the SRS/ORC controller and enables it to be updated remotely in the future. Based on technician feedback, the OTA (code: 25P5496529) does not start even after an extended period of time and several driving cycles. In addition, the "Continue" button is grayed out. Cause The exact cause for the OTA not to start is currently under analysis.
• 11022923Sep 5, 2025Electrical system. Complaint One of the flush door handles (Also referred to as Seamless Door Handles) does not extend/retract (and/or) the KeylessGo sensor surfaces do not respond. Cause Multiple possible causes can be inferred from the table, see remedy (additionally as reference table in attachment). Remedy 1) KeylessGo sensor surfaces do not respond. Door handles can extend/retract if the key is used for locking/unlocking. No…
• 11023026Sep 4, 2025Electrical system. Complaint No audio is output either in radio mode, or with media playback via app, Bluetooth or USB. In such cases, "Playback not active" is shown in the display. Cause Mute line between communication module N112/2 and sound control unit N40/3. Remedy Check the mute cable between control units N112/2 (communication module) and N40/3 (sound system). • Inspect the cable and plug contacts for damage or deformation. •…
• 11022442Aug 29, 2025Electrical system. Complaint Users report that the browser no longer supports search queries entered directly into the address bar. Cause This update is due to Microsoft discontinuing the Bing Search API, which previously supported this feature. Remedy This behavior is considered consistent with current system design and reflects the intended functionality. No corrective action is required.
• 11021966Aug 14, 2025Steering. Complaint: Creaking or humming noise during adjustment of the electric steering column, see video. Cause: The noises occur due to insufficient greasing of the steering column adjustment guide. Remedy: Disassemble bellows of steering column tube module. Move steering column entirely out and entirely down. Grease steering column on green-marked positions with a suitable brush (find pictures in attachment). Move…
• 11021802Aug 8, 2025Electrical system. Complaint: Red 12 V battery warning message in IC DTC stored in EZS or currently: B161609 No DTC in DC/DC converter DC/DC converter is not providing any output voltage or output current Cause: Due to a reduction in resistance at the HV voltage divider, the DC/DC converter measures an incorrect HV voltage. Regulation of the 12 V output voltage is therefore unstable or turns off. Remedy: Check of the DC/DC converter…
• 11022056Aug 5, 2025Steering. Complaint Valeo Steering Column Module (N80) goes into bootloader after updating software to A2239028729. To verify the supplier and software number of the steering column module. See attachment "Supplier Identification" for assistance. Cause MRSM/SCCM flashed to SW A2239028729 Remedy Please send VIN specific ID1 Support Package online using the XENTRY Kit used during the time the error occurred. Then, create an…
• 11022050Aug 5, 2025Suspension, Steering. Complaint Customer concern for ESP/Brake or Steering yellow instrument cluster message AND C220564 in the N80 Steering Column Control Module (Valeo Parts only). To check which supplier steering column module is present in the vehicle, see attachment "Supplier Identification". Cause Triggered due to communication related software timing. Remedy New software A2239026336. Update N80 (Steering Column Module) to target…

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