2024 Mercedes-Benz CLA 250 Problems

I was driving down [XXX] and heard what sounded like an explosion/loud bang sound and shattered glass. I was unsure what happened and where the sound was coming since I was driving alone on the highway and was panicked. I knew glass had broken because I heard the glass shatter and felt the air from the outside coming into the car. I found a safe place to pull over on the shoulder of the highway and found that the sunroof had shattered and there was a large hole in my sunroof. Had my shade screen not been closed on the sunroof, the glass would have fallen on me and into the vehicle. The shattered sunroof not only terrified me while driving but caused me to be so distracted that I almost caused an accident injuring myself and/or others. After calling the police, they came to clean the large pieces of glass off of the top and provided a report number and told me I could finish my drive home with my husband following behind me. I called Mercedes customer care and reported the issue and was informed to have the road side service pick the car up to be inspected at the dealership. I have owned the car for 1 month and a half. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

This vehicle has suffered from persistent, substantial, and uncorrected defects, including but not limited to failures in the 48V mild-hybrid electrical system, lithium-ion battery system, DC/DC converter and coolant system. These defects have substantially impaired the vehicle’s use, value and safety as well as my safety, and remain unresolved despite multiple repair attempts at two separate authorized Mercedes-Benz dealerships in St. Louis, MO. SUMMARY OF DEFECTS •Multiple 48 V battery failures and replacements •Multiple replacements of DC/DC converters and failures •Multiple Coolant System failures •Sudden vehicle shutdowns while driving •Numerous non-start issues •Numerous red warning alerts related to the 48 V system •Multiple towing incidents (One involving the police) Despite extensive repair attempts, including replacement of major components, this vehicle continues to fail and is currently still at Mercedes-Benz of St. Louis unrepaired. These repeated repair failures demonstrate the vehicle cannot be repaired to conform with warranty standards. SAFETY INCIDENT My most recent safety incident: On March 10, 2026, this vehicle shut down in the middle of a busy multi-lane roadway, requiring police assistance and emergency towing due to the safety hazard presented. The vehicle has remained in possession of Mercedes-Benz St. Louis since that date (over 45 days) and remains inoperable and unrepaired. This vehicle had also been towed to Plaza Motors two additional times for the same reasons and was there for many days adding to this amount (See attachments). MULTIPLE DEALERSHIPS/FAILED REPAIRS The vehicle has been serviced by both: *Plaza Motor Compay, St. Louis *Mercedes-Benz of St. Louis Despite independent repair attempts by both authorized dealerships, the same defects persist. This confirms that the issue is inherent to the vehicle itself, not a service related issue.

This vehicle has suffered from persistent, substantial, and uncorrected defects, including but not limited to failures in the 48V mild-hybrid electrical system, lithium-ion battery system, DC/DC converter and coolant system. These defects have substantially impaired the vehicle’s use, value and safety as well as my safety, and remain unresolved despite multiple repair attempts at two separate authorized Mercedes-Benz dealerships in St. Louis, MO. SUMMARY OF DEFECTS •Multiple 48 V battery failures and replacements •Multiple replacements of DC/DC converters and failures •Multiple Coolant System failures •Sudden vehicle shutdowns while driving •Numerous non-start issues •Numerous red warning alerts related to the 48 V system •Multiple towing incidents (One involving the police) Despite extensive repair attempts, including replacement of major components, this vehicle continues to fail and is currently still at Mercedes-Benz of St. Louis unrepaired. These repeated repair failures demonstrate the vehicle cannot be repaired to conform with warranty standards. SAFETY INCIDENT My most recent safety incident: On March 10, 2026, this vehicle shut down in the middle of a busy multi-lane roadway, requiring police assistance and emergency towing due to the safety hazard presented. The vehicle has remained in possession of Mercedes-Benz St. Louis since that date (over 45 days) and remains inoperable and unrepaired. This vehicle had also been towed to Plaza Motors two additional times for the same reasons and was there for many days adding to this amount (See attachments). MULTIPLE DEALERSHIPS/FAILED REPAIRS The vehicle has been serviced by both: *Plaza Motor Compay, St. Louis *Mercedes-Benz of St. Louis Despite independent repair attempts by both authorized dealerships, the same defects persist. This confirms that the issue is inherent to the vehicle itself, not a service related issue.