2025 Mercedes-Benz EQB 300 4MATIC

Since I purchased this electric vehicle, phone conversations that I place through the car have been broadcast on the external speaker. I brought this to the dealership, they acknowledged the problem, but told me they couldn't help because they didn't have another EQB to compare it to. They told me to contact Mercedes customer service. I contacted them by email, and I was repeatedly told (incorrectly) that my vehicle does not have an external speaker. They eventually ignored me. This is both a safety issue and a privacy issue. Broadcasting my phone calls to the public is a massive invasion of privacy. Secondarily, when the external speaker is playing a phone call, I assume it is not playing the required noise intended to warn pedestrians that an EV is approaching. As best as I can tell, this is a MBUX software defect that is causing the Acoustic Vehicle Alerting System (AVAS) to malfunction. I need this fixed for both safety and usability, and I have been shocked that Mercedes hasn't done a better job trying to address this problem. Additionally, a couple weeks ago, my entire screen (speedometer, maps, etc) went blank while driving. I believe there was an electric "pop" right as this happened. The screen rebooted and came back after about a minute, but then it happened again on the same drive within a couple minutes. Those are the only two times this has happened, but it was unnerving. I believe other models have been recalled for a nearly identical problem, but my vehicle was not included in the recall.I have not contacted Mercedes about the screen based on the poor response I received after having the phone issue. In summary, this is a safety issue that the Mercedes dealership acknowledged but has not and will not fix. They were able to reproduce the issue, there are no warning messages, and the vehicle is available for inspection. I would appreciate any help I can get in solving the phone problem. I would also love to know if the screen issue requires followup.

NHTSA ID

11738301

Incident

Jun 18, 2025

Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer.

Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once in each instance when changing direction of travel. Note: Sound file in attachment Cause If the complaint is eliminated by experimentally loosening the outboard collar nut (by 1 turn), the problem is due to cracking of the microweld between the wheel bearing inner race and the joint housing of the side shaft. Note: The collar nut must always be replaced after being loosened. See also LI33.20-P-078406 Remedy Coat contact surface of side shaft with wheel bearing with Molykote paint. To do this, proceed as follows: 1. Remove side shafts 2. Clean contact surface A (see image file in attachment "Outer joint housing before") before coating with Molykote, using "spirit" (free of dust and grease) 3. Coat contact surface A (see image file in attachment "Outer joint housing after") with Molykote and leave to dry for "one hour" in removed condition 4. Reinstall side shafts Note: Before using the antifriction coating (Molykote), stir it or shake it thoroughly for (at least 1 minute).

Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167: SW has been released. Update the FSAM to the latest SW version. 465, 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer.

Complaint Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop menu, e.g., 505 or 550A, which includes a service A. Cause The root cause is currently being investigated. Remedy To determine the cause, the instrument cluster control unit (N133/1) and powertrain control unit (N127) logs are required before confirming the service or correction using XENTRY Diagnosis. Please open a TIPS case to BCE inbox with the requested information in the attachments.

Complaint "Weekly profile" pre-entry climate control setting not available in the climate control menu or grayed out in the Mercedes me connect App. Cause There may be limitations on the indicator in the display due to incorrect parametrization in the head unit and PTCU SW. Remedy Open and XSS ticket and request "Delete code O98 from the data card" After, perform SCN coding for HU7 and PTCU software update (N127)

Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the instrument cluster. In addition, the following two conditions are also met: • HERMES (N112/9) control unit: event code B15CE00 is ACTIVE and STORED (A+S) • Vehicle Documentation System: For the HERMES control unit, the EID1, EID2, ICCID, IMEI, IMSI, TELNR fields in the "Identification/Serial number" column have the value "-" Cause Still under analysis Remedy Recommission the HERMES control unit (N112/9) with XENTRY Diagnosis 03/2026 and add-on 33399 installed or carry out the procedure with a newer version of XENTRY Diagnosis: XENTRY→ "N112/9 - Control unit for telematics services (HERMES)" -> "Adaptations" -> "Control unit commissioning" -> "Commissioning of previously installed control unit"