2023 Mercedes-Benz GLC 300 electrical system problems

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.

Related recalls

• An incorrect fuse box that was not designed for the vehicle may have been installed
  Campaign 25V255000 · May 12, 2025
• 80-Amp fuses may have been manufactured incorrectly, which can cause the fuses to fail
  Campaign 24V115000 · Feb 16, 2024

Related service bulletins

• 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 Aug 22, 2026

• Complaint The following most common complaints may be observed: • Brief connectivity interruptions when using Apple CarPlay over Wi-Fi • Audio cuts out • Device not recognized • No operation possible Cause There are…

  LI82.85-P-079088 · Service Bulletin/Repair Instructions · issued Aug 14, 2026

• 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…

  LI54.65-P-080132 · Service Bulletin/Repair Instructions · issued Aug 12, 2026

• Complaint DAB, 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 system" (head unit), use XENTRY…

  LI82.60-P-080806 · Service Bulletin/Repair Instructions · issued Aug 4, 2026

Electrical System problems in other GLC 300 years

Other reported problem areas on the 2023 Mercedes-Benz GLC 300