2023 Mercedes-Benz GLC 300 electrical system problems

30 owner complaints filed with NHTSA name the electrical system on the 2023 Mercedes-Benz GLC 300 — 55% of all complaints for this model year.

Electrical System complaints

55%

share of all complaints

—

median reported incident mileage

2 / 0

crash / fire reports

What owners report

“The contact owns a 2023 Mercedes-Benz GLC300. The contact stated that while driving at an undisclosed speed, the speed limit warning system failed to function as intended. The contact stated that while driving 60 MPH, the Heads-up Display (HUD) illuminated a red light and an unknown message about…”
filed Mar 19, 2026
“There are two issues 1) Unsure of the exact date, but about a year or two ago we were driving our car and the car's automatic break system went into effect on a typically busy, 3 lane road despite there not being any cars in front of our vehicle. We took it into the dealership, who confirmed the…”
filed Mar 18, 2026
“I purchased a brand new GLC 300 on May 25, 2023. By June 2, 2023 I was already stranded due to a 12V battery electrical system failure. Since then I have been stranded 8 total times and the vehicle has been in the service department 14+ times for repeated electrical issues (8 of those visits were related to the same…”
filed Mar 5, 2026

Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.

Complaint After an "Over the Air" update (OTA), FM or SDARS radio reception is limited; only a few stations are found. Cause The firmware installation was incomplete. Remedy In the A26/17 control unit "MBUX multimedia…
LI82.60-P-080806 · Service Bulletin/Repair Instructions · issued Jul 17, 2026
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…
LI54.71-P-079104 · Service Bulletin/Repair Instructions · issued Jul 9, 2026
Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of updating to the new one. Cause When a new station change request is triggered, a…
LI82.60-P-080383 · Service Bulletin/Repair Instructions · issued Jul 8, 2026
We are experiencing intermittent issues when flashing A26/17 - MBUX multimedia system + Instrument cluster (Head unit) when using flashing method ethernet to USB-C. Until further notice, please flash via VCI only.
ANN Interm. Issues Flash · Other · issued Jul 2, 2026
Complaint 1. "Perform vehicle handover" in the workshop menu to start the maintenance computer for service A/B cannot be carried out. 2. Service confirmation is not possible because "Perform vehicle handover" is…
LI00.20-P-077615 · Service Bulletin/Repair Instructions · issued Jul 1, 2026