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 over again. Couldn't get the key to make car lock or unlock. The car would not turn on, it would not turn off. The alarm message was persistent. Had to call a tow-truck to take it in for service. After 3+ hours the car restarted. Mercedes initiated "Campaign: Update Powertrain Control Unit Software #2023060007". They found multiple communication faults in various modules. I was left stranded. This happened 3 times. Twice in front of the house and the 3rd time (when it was towed) I was far from home. The mechanic explained that the car had sensors indicating the car was being stolen so that is why it didn't start. That make no sense! I had the key. I had been driving it that day. It was working fine. A brand new 2023 car should be reliable. It should start when the owner has the key fob in hand. Shutting the car down for hours is a system failure. Please investigate.
2023 Mercedes-Benz GLC 300 complaints
Owner reports filed with NHTSA about this vehicle, newest first and reproduced as filed. They are unverified accounts: one proves nothing, and a pattern across many is the thing worth reading. Back to the full 2023 record →
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.
1. The rear hatch has opened while the car was left unattended. 2. If the hatch opens it could possibly cause a safety issue: a.By opening while driving. This has not happened and I do not know if Mercedes has a safety lock to ensure this could not happen. b.Open while parked and unattended. The vehicle would be unsecured with items being subjected to being stolen. c.Open while parked at the store, mall, etc. A stranger could get in the rear of the vehicle, close the hatch and wait for me to return causing a dangerous situation. d.Open and damage the garage door if parked in the garage; e.Open while someone is in the back of the vehicle. Should this happen, a person could be pinned against another vehicle or garage door. 3.Mercedes Benz is aware of this issue on many of their vehicles. I was told the S class Mercedes has had a similar problem and Mercedes reprogrammed the key fob to a “2X push of the rear hatch button on the key fob”. They have yet to do this on my vehicle. 4.The vehicle has not been inspected by Mercedes, however, in discussing this with the Mercedes Service Department they are aware of this issue and as of today there is not a similar fix as to that of the S class Mercedes. Mercedes is aware of this problem but has yet to offer a fix. Also, upon doing an internet search, I have discovered others having experienced similar problems over the course of many years. 5.There were no warning lamps, messages, or other symptoms relating to the problem. This problem
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 available for inspection upon request? Yes, but on the second day, the MB service dep told me that the car was having a system update (while I was driving the car and it turned off the engine by doing that) 2. How was your safety or the safety of others put at risk? I was still driving with 40m/h+ on the road, my car suddenly having a malfunction. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? No, I called MB USA, they started a purchase buyback application, but still let me drive that car. 4. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? No. The 3 warning lamps showed when the engine shut off while I was driving. There was no other symptoms of the problem prior to the failure. The car is new, 2023 GLC 300, the dealership is AutoNation, only has 2400 miles on it do far, one month only so far.
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 without the use of this car for 28 days today. The service manager called today and Mercedes is trying to fix the problem, they say it is happening to many people.
Reading these
NHTSA publishes every complaint as the owner wrote it and investigates only a fraction. Spelling, capitalisation and judgement are the filer’s own. What carries weight is repetition: the same component failing the same way across many filings, and whether the manufacturer eventually opened a recall for it.
Full record for the 2023 Mercedes-Benz GLC 300 → · Every GLC 300 year → · How the figures are calculated →