2023 Mercedes-Benz GLC 300 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
55 owner complaints analyzed
12 distinct recall campaigns
8,500 mi median reported failure mileage
Scope: 2023 model year. Data snapshot: . 6 complaints include usable failure mileage.
Most common problems
Electrical System is the most frequently named component, appearing in 30 of 55 complaints (54.5%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Electrical and battery issues | 16 | 29.1% |
| Braking behavior | 11 | 20.0% |
| Transmission and shifting | 3 | 5.5% |
| Engine operation | 2 | 3.6% |
| Steering behavior | 2 | 3.6% |
| Fuel system concerns | 2 | 3.6% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Electrical System | 30 |
| Engine | 15 |
| Exterior Lighting | 10 |
| Unknown Or Other | 8 |
| Forward Collision Avoidance: Automatic Emergency Braking | 6 |
| Fuel/Propulsion System | 5 |
| Service Brakes | 5 |
| Lane Departure: Blind Spot Detection | 4 |
Electrical System: 30; Engine: 15; Exterior Lighting: 10; Unknown Or Other: 8; Forward Collision Avoidance: Automatic Emergency Braking: 6; Fuel/Propulsion System: 5; Service Brakes: 5; Lane Departure: Blind Spot Detection: 4
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 6 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 6; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (6). 49 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2023 | 25 |
| 2024 | 23 |
| 2025 | 3 |
| 2026 | 4 |
2023: 25; 2024: 23; 2025: 3; 2026: 4
Pattern summary
Electrical System leads the component reports. Electrical and battery issues appears in 16 complaint narratives. Braking behavior appears in 11 complaint narratives. Transmission and shifting appears in 3 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11529864 · 2023-07-01 (July 1, 2023)
Sunday, June 25, when I was driving the car on the road, the engine shut off and the car stopped running. 3 warning lights show on screen: engine light; 48v Battery Service Required; 12v Battery service required. I used the break to park the car on the roadside after that. I tried many times to restart the car, Waited over one hour and 40 minutes it finally started again, the engine warning light was still on until the second day morning, and I was able to take pics as evident. 1. What component or system failed or malfunctioned, and is it a…
Owner-reported narrative. Look up ODI 11529864 at NHTSA ↗
Owner report 11533472 · 2023-07-20 (July 20, 2023)
Petition: Consumer requests a focused review of the ISG 48-volt onboard electrical system used in various Mercedes-Benz vehicles and the expansion or initiation of a new recall to include 2023 300GLC vehicles.
Owner-reported narrative. Look up ODI 11533472 at NHTSA ↗
Owner report 11536672 · 2023-08-05 (August 5, 2023)
Unexpectedly and without any indication or warning, at [XXX] on [XXX] I experienced multiple system failures/engine light/critical warning lights/. Transmission error message states do not shift into gear, take for service. Engine check light on. Car would not start, car was unable to be put into park. Door alarm for transmission not in park was alarming audible. After car shut off and attempt to put into park the car would not engage into park and the car electronics malfunctioned, would not stop alarming despite off, multiple error messages, …
Owner-reported narrative. Look up ODI 11536672 at NHTSA ↗
Owner report 11538722 · 2023-08-15 (August 15, 2023)
This 2023 GLC, a newly redesigned model, has a number of issues. The two most severe are the adaptive speed limit and the lane keeping assist. I had to disable the traffic sign recognition feature because I was on I-95 in Maryland where the posted speed limit was 65. The car abruptly slowed me down to 35 because it saw an exit sign speed limit but I was not on the exit. I was lucky the car behind me didn't hit me. A warning would be good but to brake the vehicle for a speed limit sign seems problematic. The more serious issue is the lane …
Owner-reported narrative. Look up ODI 11538722 at NHTSA ↗
Owner report 11537315 · 2023-08-08 (August 8, 2023)
VEHICLE SHUT DOWN WHILE DRIVING. WARNING LIGHTS ILLUMINATE, CHECK ENGINE LIGHT, DO NOT SHIFT INTO GEAR WARNING, 48V BATTERY WARNING, ETC. WOULD NOT STOP ALARMING. COULD NOT SHUT OFF CAR. COULD NOT PUT CAR INTO PARK. COULD NOT START CAR. WARNING BUZZER WOULD GO OFF ENTIRE TIME. CAR WAS ONLY ABLE TO BE STARTED WHEN REMOTE START REQUEST WAS INITIATED WHEN CAR WAS IN THIS MODE, CAR WAS STARTED BUT THEN SHUT OFF 10 SECONDS LATERS APP STATES, “CHECK ENGINE LIGHT ON” WIL SHUT OFF THE CAR. CAR BACK TO NORMAL AFTER EVENT APPROX 60 MIN BUT CHECK ENGINE L…
Owner-reported narrative. Look up ODI 11537315 at NHTSA ↗
Owner report 11563288 · 2024-01-03 (January 3, 2024)
This vehicle has now had three episodes where warning lights came on for no apparent reason. There have been two episodes of "Check Engine Light" coming on, the first with less than 1000 miles on the vehicle. It was driven to the dealer and they checked finding no problems and said not to worry about it. The second about two months later with an indication of "Excessive engine Temperature", but the engine was cold and just started, the fan was running very fast, but otherwise the vehicle was operable. Again, the dealer could find no problem…
Owner-reported narrative. Look up ODI 11563288 at NHTSA ↗
Owner report 11607936 · 2024-08-12 (August 12, 2024)
The contact owns a 2023 Mercedes-Benz GLC 300 W4. The contact stated that when his wife was parking the vehicle at approximately 5 MPH and when she depressed the brake pedal, the vehicle stalled. The contact stated that his wife said that the brake pedal failed, and the instrument cluster was black. The contact stated that his wife had observed that the brake warning had been illuminated before the instrument cluster failure. The contact stated that his wife jumped the curb and crashed into the wall of a building. The contact stated that the fr…
Owner-reported narrative. 7,000 miles reported. Look up ODI 11607936 at NHTSA ↗
Owner report 11538778 · 2023-08-15 (August 15, 2023)
Brand new car that had less than 1500 miles on it, one day went to start it while 20 miles away from home and error messages in dash and beeping "48V battery error, do not change transmission position, reduced functionality of driver assistance features...etc." and car would not start, could not turn steering wheel.
Owner-reported narrative. Look up ODI 11538778 at NHTSA ↗
Owner report 11563307 · 2024-01-03 (January 3, 2024)
My car was in for a "Problem" Dec-2023 - would not accelerate /also getting very bad gas mileage and hesitation on accelerating. 1ST - Mercedes Benz said I got bad gas - they had the car for several days -Then they thought it was a computer issue - Later -after problem -I got a Safety Recall Notice # 23V456 stating "Fuel Pump Problem "told would receive Official Re-Call in February -Went back to dealer with same problem -was told wait for re-call -Called [phone removed] Mercedes Benz - spoke with "Heidi on Jan 3, 2024 [Case Number [XXX] ASKED …
Owner-reported narrative. Look up ODI 11563307 at NHTSA ↗
Owner report 11685600 · 2025-09-07 (September 7, 2025)
Vehicle has a significant engine oil leak without being driven. Engine oil electronic meter still shows engine oil to be in "Ok" range. Vehicle is 2023 with only 19680 miles and is rarely driven till the last 2 months. Other 2023 Model Year MB GLC300's manufactured at the same Bremen Germany plant are already being recalled for engine and fuel leaks, however, this one is not on the list. This vehicle is also the 2.0L Inline 4 engine and may be the same engine as the others being recalled. The others are recalled due to an imperfect sea…
Owner-reported narrative. Look up ODI 11685600 at NHTSA ↗