2023 Mercedes-Benz GLC 300

Problems, Recalls & Reliability Report

Below Average

Quick Summary

The 2023 Mercedes-Benz GLC 300 has 99 owner complaints filed with NHTSA — that's 1.2x the segment average of 80. The most common issue is electrical problems (30% of all complaints), specifically: when starting the vehicle, all the lights and alarms have come on and vehicle is not drivable. this has happened 4 times. 3/4 times the vehicle has started after an hour or two. one time i have had to have it towed in. i bought this car on april 27th. first time this happened was 5/29. i have been w.

3 crash reports 4 injuries

Total Complaints

Recalls Issued

—/5

Safety Stars

1.2x

vs Segment Avg

Known Problems

ELECTRICAL

30 complaints

30%

• When starting the vehicle, all the lights and alarms have come on and vehicle is not drivable. This has happened 4 times. 3/4 times the vehicle has started after an hour or two. One time I have had to have it towed in. I bought this car on April 27th. First time this happened was 5/29. I have been w
• 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 res
• 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.

Typical onset: 50K miles Est. repair: $500💥 2 crashes

“When starting the vehicle, all the lights and alarms have come on and vehicle is not drivable. This has happened 4 times. 3/4 times the vehicle has started after an hour or two. One time I have had to have it towed in. I bought this car on April 27th. First time this happened was 5/29. I have been w”

— NHTSA complaint filing

ENGINE

15 complaints

15%

• 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 res
• The 2023 GLC300 would not start. The internal alarms kept going off, the push-start/stop would not respond. The vehicle was acting like it was being stolen, this lasted for 75 to 80 minutes. The display said 12V On-Board Electrical System Service Required and Blind Spot Assist Inoperative - over and
• 1 ) the car would not start several times. every error message scanned across the screen and i had to leave the car and lock it and wait 10-15 minutes and then it would start. if i had any type of emergency and this happened, it would be detrimental. the first time this happened was the day i got th

Typical onset: 50K miles Est. repair: $500

“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 res”

— NHTSA complaint filing

DRIVER ASSIST/CAMERAS

14 complaints

14%

• The moon roof will not close. There is also a sloshing sound of water in an unidentified area, it has not rained. The blind spot monitor function of the digital light projection works intermittently and is barely visible marking on the roadway. The exit assist also does not activate the ambient l
• 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 do
• 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 tur

Typical onset: 50K miles Est. repair: $500

“The moon roof will not close. There is also a sloshing sound of water in an unidentified area, it has not rained. The blind spot monitor function of the digital light projection works intermittently and is barely visible marking on the roadway. The exit assist also does not activate the ambient l”

— NHTSA complaint filing

LIGHTING

10 complaints

10%

• 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 res
• 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 pa
• Digital Light Inactivean High Beam Assist messages Also, when you engage the inoperative warning the actuates blinker it off [brights/high blinds beams even when drivers. auto adaptive setting is day with lights off see the high beam blue light on with headlight malfunctions vehicle 248595-Connect

Typical onset: 50K miles Est. repair: $500

— NHTSA complaint filing

OTHER

9 complaints

• 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 B
• 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 tur
• The contact owns a 2023 Mercedes-Benz GLC300. The contact stated while attempting to start the vehicle, the message "12 Volt Battery Failure, Vehicle Inoperative" was displayed. Later, the contact was able to start the vehicle, but the check engine warning light remained illuminated. Eventually the

Typical onset: 50K miles Est. repair: $500

“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 B”

— NHTSA complaint filing

Estimated Repair Costs

ELECTRICAL(~50K mi)

$500

ENGINE(~50K mi)

$500

DRIVER ASSIST/CAMERAS(~50K mi)

$500

LIGHTING(~50K mi)

$500

OTHER(~50K mi)

$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 99 owner complaints for this specific year, here's what to check or ask about:

☐
ELECTRICAL: When starting the vehicle, all the lights and alarms have come on and vehicle is not drivable. This has happened 4 times. 3/4 times the vehicle has started after an hour or two. One time I have had to have it towed in. I bought this car on April 27th. First time this happened was 5/29. I have been w
Typically appears around 50K miles. Repair cost ~$500
☐
ENGINE: 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 res
Typically appears around 50K miles. Repair cost ~$500
☐
DRIVER ASSIST/CAMERAS: The moon roof will not close. There is also a sloshing sound of water in an unidentified area, it has not rained. The blind spot monitor function of the digital light projection works intermittently and is barely visible marking on the roadway. The exit assist also does not activate the ambient l
Typically appears around 50K miles. Repair cost ~$500
☐
LIGHTING: 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 res
Typically appears around 50K miles. Repair cost ~$500
☐
General: Get a pre-purchase inspection from an independent mechanic ($100-$200)