GLC'23 check engine light is on
MBWorld Fanatic!
Joined: May 2023
Posts: 1,122
Likes: 310
'23 GLS450
The Blazer is an extreme case.
I had a 2021 Audi A4, custom ordered, that would not start during the first month of ownership, had me stranded. It was flat bedded back to the dealership and had a control board replaced under warranty. Since then I owned it for 13 years, longest I have ever owned a car. I owned it for so long because I enjoyed it so much, drove great, comfortable, interior was beautiful (never looked dated). Point is, these operating and design traits carry more weight for me in my buying decision than the unknown reliability of one particular car compared to another. You can overcome the failure of a component but you can’t change the appeal (or lack of) of a car. Most of the car forums are filled with owners reporting transient problems, even vaunted makes like Genesis. I have not had any problem with my 48V system and I would not tell anybody considering a MB to stay away due to the small number of problems discussed here out of the thousands sold.
I am getting sucked into the online auto forum world. I’ve got to cut this out.
I had a 2021 Audi A4, custom ordered, that would not start during the first month of ownership, had me stranded. It was flat bedded back to the dealership and had a control board replaced under warranty. Since then I owned it for 13 years, longest I have ever owned a car. I owned it for so long because I enjoyed it so much, drove great, comfortable, interior was beautiful (never looked dated). Point is, these operating and design traits carry more weight for me in my buying decision than the unknown reliability of one particular car compared to another. You can overcome the failure of a component but you can’t change the appeal (or lack of) of a car. Most of the car forums are filled with owners reporting transient problems, even vaunted makes like Genesis. I have not had any problem with my 48V system and I would not tell anybody considering a MB to stay away due to the small number of problems discussed here out of the thousands sold.
I am getting sucked into the online auto forum world. I’ve got to cut this out.
Have you checked sites like Edmunds where customers post their reviews? The MY23 GLC is averaging 2.8 out of 5 stars over 24 reviews:
https://www.edmunds.com/mercedes-ben...sumer-reviews/
I'm not pushing any brands or cars. My question to everyone is does Mercedes get a pass in light of the initial quality issues folks are reporting?
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,205
Likes: 272
From: North CA
2021 E63S and 2025 GT63
[QUOTE=EWL5;8908074]Yeah, it would be nice if it was just the forums.
Have you checked sites like Edmunds where customers post their reviews? The MY23 GLC is averaging 2.8 out of 5 stars over 24 reviews:
https://www.edmunds.com/mercedes-ben...sumer-reviews/
I'm not pushing any brands or cars. My question to everyone is does Mercedes get a pass in light of the initial quality issues folks are reporting?[/QUOTE]
Really, spamming with countless references to CR brand ratings is not “pushing any brand…” LOL
Then what is the driving force and motivation behind crusade against MB?
1. Posting about 48v issues 20 times more than the people impacted? While advertising BMW CR ranking as #1 brand?
2. Collecting statistics - how many owners actually reported issues based on your survey today
https://mbworld.org/forums/glc-class...ml#post8908033
Too much free time and can’t find anything better to do?
Can you please enlighten us on what are you really trying to accomplish here?
Have you checked sites like Edmunds where customers post their reviews? The MY23 GLC is averaging 2.8 out of 5 stars over 24 reviews:
https://www.edmunds.com/mercedes-ben...sumer-reviews/
I'm not pushing any brands or cars. My question to everyone is does Mercedes get a pass in light of the initial quality issues folks are reporting?[/QUOTE]
Really, spamming with countless references to CR brand ratings is not “pushing any brand…” LOL
Then what is the driving force and motivation behind crusade against MB?
1. Posting about 48v issues 20 times more than the people impacted? While advertising BMW CR ranking as #1 brand?
2. Collecting statistics - how many owners actually reported issues based on your survey today
https://mbworld.org/forums/glc-class...ml#post8908033
Too much free time and can’t find anything better to do?
Can you please enlighten us on what are you really trying to accomplish here?
MBWorld Fanatic!
Joined: May 2023
Posts: 1,122
Likes: 310
'23 GLS450
Last edited by EWL5; Jan 15, 2024 at 06:04 PM.
Junior Member
Joined: May 2023
Posts: 27
Likes: 12
From: NE Ohio
2023 GLC
I purchased my 2023 GLC in May 2023,nothing but problems. Yesterday the check engine light stayed on long enough to get to the dealer so they could physically see it.
The Service Writer had a Tech scan the system and this time its an issue with the 48 Volt System. MB has no fix yet but they can do a workaround by discharging and recharging the 48 volt battery but to
expect the check engine light to come back on until MBUSA can come up with a fix. This issue is for the 2024 model also and any other MB with a 48volt system, so they tell me..
I'm done ! The 2023 has been back to the Dealer over 10 times and they have kept it for a total14 days .No starts, Check Engine Light numerous times,Driver Assist issues, Digital Light problems, Low Oil Pressure warning, Battery Critical charge,48 Volt Issues, MBUX finger print reader inop. bad ground connection on body etc. etc.
This morning I contacted an Attorney that specializes in Lemon Law and they consider I have a case and would like to pursue a Buy Back with no expense to me.
The Service Writer had a Tech scan the system and this time its an issue with the 48 Volt System. MB has no fix yet but they can do a workaround by discharging and recharging the 48 volt battery but to
expect the check engine light to come back on until MBUSA can come up with a fix. This issue is for the 2024 model also and any other MB with a 48volt system, so they tell me..
I'm done ! The 2023 has been back to the Dealer over 10 times and they have kept it for a total14 days .No starts, Check Engine Light numerous times,Driver Assist issues, Digital Light problems, Low Oil Pressure warning, Battery Critical charge,48 Volt Issues, MBUX finger print reader inop. bad ground connection on body etc. etc.
This morning I contacted an Attorney that specializes in Lemon Law and they consider I have a case and would like to pursue a Buy Back with no expense to me.
I called dealer service dept. and asked them if I could drop the car off when they have a loaner available and keep the loaner until my car is fixed, they said no, that they would have
to give a loaner to everyone with that problem and they don't have enough cars. They also said that it's not a safety issue and I could stop by the my local Auto Zone to check the code
to make sure the CEL code is for the 48volt issue and not for another problem. If it wasn't so cold here in Ohio I would apply for a Picketing Permit :-)
Junior Member
Joined: Dec 2023
Posts: 41
Likes: 19
2024 GLC300 2025 E450
Took to dealer yesterday and waited while they discharged and recharged the batteries. CEL was out when I left the dealership. CEL came back on the next time I started it.
I called dealer service dept. and asked them if I could drop the car off when they have a loaner available and keep the loaner until my car is fixed, they said no, that they would have
to give a loaner to everyone with that problem and they don't have enough cars. They also said that it's not a safety issue and I could stop by the my local Auto Zone to check the code
to make sure the CEL code is for the 48volt issue and not for another problem. If it wasn't so cold here in Ohio I would apply for a Picketing Permit :-)
I called dealer service dept. and asked them if I could drop the car off when they have a loaner available and keep the loaner until my car is fixed, they said no, that they would have
to give a loaner to everyone with that problem and they don't have enough cars. They also said that it's not a safety issue and I could stop by the my local Auto Zone to check the code
to make sure the CEL code is for the 48volt issue and not for another problem. If it wasn't so cold here in Ohio I would apply for a Picketing Permit :-)
Junior Member
Joined: May 2023
Posts: 27
Likes: 12
From: NE Ohio
2023 GLC
no all weather mats, First Aid kit missing and a 2022 Owner's Manual. It took a few weeks for me to get the second set of keys. No more MB for me.
Newbie
Joined: Jan 2024
Posts: 2
Likes: 1
2023 GLC300
GLC'23 check engine light is on
2023 GLC300 with 2500 miles. Last week got the check engine light. I checked the gas cap but it was not the issue. Got an appointment to take car into dealership. Before I was able to get the car in, the ABS, traction control and a couple of other lights came on. They looked at the code and said it was a bad wheel speed sensor. Had to order part which arrived the next day. It was installed and was then told it was a faulty brand new part. Ordered another speed sensor along with a wheel bearing(?). Three days later and after several unresponsive calls to dealer and no loaner. they finally called and said car was done. When I picked the car up they said that they replaced the right front wheel bearing. How does a wheel bearing fail after 2500 miles? I was also sold that the check engine light was still on due to a problem with the 48v system and they currently have no fix. They said they had 5 other cars with same problem. I was assured that the car was safe to drive. I am glad it is under warranty, but I sure don't have a warm and fuzzy about this car doing forward. It is a shame. This is my first MB and I really love this car
Banned
Joined: Nov 2023
Posts: 63
Likes: 8
From: Southern
GLC
I have never disabled the start/stop feature. I use the Comfort Mode and on weekdays I drive an average of 15 minutes per trip.
I'm sure my driving pattern does not help with the 48 volt issue, but MBUSA admits they have a problem with the 48 volt system and they have no fix at this
time. According to the Dealer it's not just the 2023 GLC but 2024's and other models affected.
I have owned 12 vehicles in the last 14 years since I retired. This 2023 GLC has more problems than all the others combined. The 2022 GLC that I traded for this car
only went back to the dealer for the Service A at a year old. When I bought the 2023 with all the features I could not get on the 2022 I thought this will be my last car
and keep it until I can no longer drive. I am very disappointed with the attitude of the MB Dealers and MBUSA ,they do not understand the importance of good customer service.
I'm sure my driving pattern does not help with the 48 volt issue, but MBUSA admits they have a problem with the 48 volt system and they have no fix at this
time. According to the Dealer it's not just the 2023 GLC but 2024's and other models affected.
I have owned 12 vehicles in the last 14 years since I retired. This 2023 GLC has more problems than all the others combined. The 2022 GLC that I traded for this car
only went back to the dealer for the Service A at a year old. When I bought the 2023 with all the features I could not get on the 2022 I thought this will be my last car
and keep it until I can no longer drive. I am very disappointed with the attitude of the MB Dealers and MBUSA ,they do not understand the importance of good customer service.
I have a 2024 GLC 300, purchased in November of 23 within the first 300 mi I had a fan fan on at full speed that would not stop., then of course it went away and was left with an engine light, then within a few weeks I was left stranded with multiple warning messages on the dashboard had to have it towed. They did software updates within a few weeks it all happened again only this time I was able to start the car after waiting for about 4 hours. I was experiencing off and on 12-volt battery messages on my Mercedes app. I drive the card daily, I have read all of the blogs from these forums about turning this off or that off or putting it in standby mode blah blah blah blah. At the end of the day you should be able to pull your car in the garage get out leave it unlocked and go in the house and not worry about it.
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Member
Joined: Apr 2023
Posts: 197
Likes: 50
From: Vermont
2023 GLC 300, 2021 VW ID4
I have a 2024 GLC 300, purchased in November of 23 within the first 300 mi I had a fan fan on at full speed that would not stop., then of course it went away and was left with an engine light, then within a few weeks I was left stranded with multiple warning messages on the dashboard had to have it towed. They did software updates within a few weeks it all happened again only this time I was able to start the car after waiting for about 4 hours. I was experiencing off and on 12-volt battery messages on my Mercedes app. I drive the card daily, I have read all of the blogs from these forums about turning this off or that off or putting it in standby mode blah blah blah blah. At the end of the day you should be able to pull your car in the garage get out leave it unlocked and go in the house and not worry about it.
Member
Joined: Feb 2023
Posts: 82
Likes: 25
From: Suburban Chicago in Illinois
2024 GLC-300 & 2022 GLE-350
Took to dealer yesterday and waited while they discharged and recharged the batteries. CEL was out when I left the dealership. CEL came back on the next time I started it.
I called dealer service dept. and asked them if I could drop the car off when they have a loaner available and keep the loaner until my car is fixed, they said no, that they would have
to give a loaner to everyone with that problem and they don't have enough cars. They also said that it's not a safety issue and I could stop by the my local Auto Zone to check the code
to make sure the CEL code is for the 48volt issue and not for another problem. If it wasn't so cold here in Ohio I would apply for a Picketing Permit :-)
I called dealer service dept. and asked them if I could drop the car off when they have a loaner available and keep the loaner until my car is fixed, they said no, that they would have
to give a loaner to everyone with that problem and they don't have enough cars. They also said that it's not a safety issue and I could stop by the my local Auto Zone to check the code
to make sure the CEL code is for the 48volt issue and not for another problem. If it wasn't so cold here in Ohio I would apply for a Picketing Permit :-)
Woke up today to the coldest morning my 2024 GLC300 8,200 miles has yet experienced. 8 Degrees and the car sits outside in the driveway 24/7. The remote start worked, but the car only ran for less than a minute before cutting off. Got in, started and drove it to the gym. Drove normally, but the Check Engine Light was illuminated and stayed on driving to the gym and return home (3 miles round trip).
I sent a text message to my service contact at the dealer. She said they will run a remote diagnostic and get back to me with what they find. While they're doing that, I'm searching the internet (and this forum) to see what the potential causes are.
My first Mercedes. (Formerly Hyundai and Honda) It's startling see that light come on so early in a car's life. And a Mercedes Benz none-the-less!
-Allen in Chicago
Member
Joined: Feb 2023
Posts: 82
Likes: 25
From: Suburban Chicago in Illinois
2024 GLC-300 & 2022 GLE-350
December 12, 2024
Woke up today to the coldest morning my 2024 GLC300 8,200 miles has yet experienced. 8 Degrees and the car sits outside in the driveway 24/7. The remote start worked, but the car only ran for less than a minute before cutting off. Got in, started and drove it to the gym. Drove normally, but the Check Engine Light was illuminated and stayed on driving to the gym and return home (3 miles round trip).
I sent a text message to my service contact at the dealer. She said they will run a remote diagnostic and get back to me with what they find. While they're doing that, I'm searching the internet (and this forum) to see what the potential causes are.
My first Mercedes. (Formerly Hyundai and Honda) It's startling see that light come on so early in a car's life. And a Mercedes Benz none-the-less!
-Allen in Chicago
Woke up today to the coldest morning my 2024 GLC300 8,200 miles has yet experienced. 8 Degrees and the car sits outside in the driveway 24/7. The remote start worked, but the car only ran for less than a minute before cutting off. Got in, started and drove it to the gym. Drove normally, but the Check Engine Light was illuminated and stayed on driving to the gym and return home (3 miles round trip).
I sent a text message to my service contact at the dealer. She said they will run a remote diagnostic and get back to me with what they find. While they're doing that, I'm searching the internet (and this forum) to see what the potential causes are.
My first Mercedes. (Formerly Hyundai and Honda) It's startling see that light come on so early in a car's life. And a Mercedes Benz none-the-less!
-Allen in Chicago
My 10,000 mile "Service A" is 1,700 miles (about 45 days) away. We'll see if Mercedes can provide a more detailed explanation at that time.
Senior Member
Joined: Nov 2007
Posts: 431
Likes: 64
From: Delray Beach, Fl
GLC SUV 350e4 Verde Silver Metallic
Mercedes did a remote diagnosis and determined that my "exhaust flaps" were frozen shut. My service contact told me not to worry. As the temperature warmed, they would unfreeze. After the temp went over 18 degrees that day, the engine light went out and stayed that way for a couple of weeks. Right after Christmas 2024, it started coming on again periodically, whenever the temp was below 32 degrees. The way the car drives or sounds is no different, but its still a bit disconcerting seeing the check-engine light illuminated while driving.
My 10,000 mile "Service A" is 1,700 miles (about 45 days) away. We'll see if Mercedes can provide a more detailed explanation at that time.
My 10,000 mile "Service A" is 1,700 miles (about 45 days) away. We'll see if Mercedes can provide a more detailed explanation at that time.
Last edited by DESAL; Jan 17, 2025 at 09:06 AM.
Member
Joined: Feb 2023
Posts: 82
Likes: 25
From: Suburban Chicago in Illinois
2024 GLC-300 & 2022 GLE-350
My 2023 has 10,000 miles and I have had the check engine light on since Feb.5 when on I-95 at around 60mph I lost power. Not even the electric boost would come on. I felt like I was running on 1 cylinder. This happened twice in a matter of a mile or so. Engine came back to life, and I made it to the dealership. Maybe a year ago had a similar experience but this time it was on a city road and the car came back to life. The engine light turned off and never came back until this incident. Only have this car so have been forced to wait till the next loaner is available on the 28th. Engine light still on but car is performing faultlessly. Wondering what service will come up with. Stay tuned.
Considering some of the problems I read about in this forum, my "problem" is very minor. Hopefully nothing big will occur. I've learned to do 3 year leases @ 15,000 miles per year. Always under warranty...and very few problems before reaching the 45,000 miles with each car.
Newbie
Joined: Jan 2025
Posts: 2
Likes: 0
I'm afraid I'm not one of the lucky ones. I own a 2024 GLC 300 with only 15,000 km (less than 10,000 miles) on it, and it's already been a nightmare. Recently, I've had to visit the dealership three times in just the last three weeks due to the Engine Light coming on. I picked up my car from the dealership today after the third repair, and the Engine Light came on again after just a few hundred meters leaving the dealership's parking lot.
I've already booked my next appointment for next week, which will be my fourth visit for the same issue. What's even more frustrating is that the dealer told me, "You can drive the car with the Engine Light on without any performance issues." I find this solution to be quite weird, as it doesn't address the underlying problem. If there's no performance issue, then why is the Engine Light coming on in the first place? It's a clear indication that something is wrong.
But what's even more concerning is that ignoring the Engine Light could lead to more severe issues down the road. What if the problem escalates and causes damage to other critical engine components? What if it leads to a breakdown or even an accident? The dealer's advice to ignore the light seems reckless and irresponsible.
Based on my experience, I would caution against purchasing a GLC 300, at least until Mercedes-Benz addresses these reliability concerns. I understand that there may be some owners who haven't experienced issues, but my story is a cautionary tale.
I've already booked my next appointment for next week, which will be my fourth visit for the same issue. What's even more frustrating is that the dealer told me, "You can drive the car with the Engine Light on without any performance issues." I find this solution to be quite weird, as it doesn't address the underlying problem. If there's no performance issue, then why is the Engine Light coming on in the first place? It's a clear indication that something is wrong.
But what's even more concerning is that ignoring the Engine Light could lead to more severe issues down the road. What if the problem escalates and causes damage to other critical engine components? What if it leads to a breakdown or even an accident? The dealer's advice to ignore the light seems reckless and irresponsible.
Based on my experience, I would caution against purchasing a GLC 300, at least until Mercedes-Benz addresses these reliability concerns. I understand that there may be some owners who haven't experienced issues, but my story is a cautionary tale.
Senior Member
Joined: Nov 2007
Posts: 431
Likes: 64
From: Delray Beach, Fl
GLC SUV 350e4 Verde Silver Metallic
My car was diagnosed by Mercedes while it was at my house. Somehow they can run a series of tests while your car sits cold/off in your driveway or garage. I sent a text to my service contact lady. She responded, "Thanks Allen. We'll run some tests/diagnosis and get back to you." About 3 hours later, Janet responded, "Mercedes tech department says you have a frozen engine exhaust flap. When it thaws, your engine light will go out". It's been on at least 3 more times since that exchange in December, but never accompanied by any engine operation strangeness.
Considering some of the problems I read about in this forum, my "problem" is very minor. Hopefully nothing big will occur. I've learned to do 3 year leases @ 15,000 miles per year. Always under warranty...and very few problems before reaching the 45,000 miles with each car.
Considering some of the problems I read about in this forum, my "problem" is very minor. Hopefully nothing big will occur. I've learned to do 3 year leases @ 15,000 miles per year. Always under warranty...and very few problems before reaching the 45,000 miles with each car.
Newbie
Joined: Jan 2025
Posts: 2
Likes: 0
At the third visit, dealer replaced the flap exhaust after few hundred meters leaving the dealer parking lot the engine light turning ON again. I has booked for the 4th visit for next week. I do not think the flap exhaust issue. I am in Canada and in winter now.
Member
Joined: Nov 2012
Posts: 83
Likes: 20
2023 GLC 300 2022 GLE 53 AMG Coupe
A few weeks ago, my check engine light came on and then went away after a few days. I took the car in for service and the service code said that the light was triggered by a low reading on an accessory light in the driver's door. I have no idea why that would trigger the check engine light.
Senior Member
Joined: Nov 2007
Posts: 431
Likes: 64
From: Delray Beach, Fl
GLC SUV 350e4 Verde Silver Metallic
Had the car serviced and the check engine light was caused by a failure of the fuel pump seal. They replaced the whole pump. This failure occurred at 60mph on I95. The car just died in the middle lane. Was able to get to coast to the breakdown lane. Restarted car and was able to get home.
Asked the SA why the mild hybrid electric didn't kick but they couldn't tell me!
Does anyone have any idea why no electric drive capability? Would have thought it would be in gauged for a short period of time.
Asked the SA why the mild hybrid electric didn't kick but they couldn't tell me!
Does anyone have any idea why no electric drive capability? Would have thought it would be in gauged for a short period of time.
Member
Joined: Apr 2023
Posts: 197
Likes: 50
From: Vermont
2023 GLC 300, 2021 VW ID4
There is no drive motor in the GLC in the sense that it is connected to the wheels. I believe Mild Hybrid just refers to the 48V alternator/starter motor that is located between the motor and the transmission. This is common in other cars these days for example Volvo.
Last edited by Gitzer; Feb 6, 2025 at 03:57 PM.
MBWorld Fanatic!
Joined: May 2023
Posts: 1,122
Likes: 310
'23 GLS450
Had the car serviced and the check engine light was caused by a failure of the fuel pump seal. They replaced the whole pump. This failure occurred at 60mph on I95. The car just died in the middle lane. Was able to get to coast to the breakdown lane. Restarted car and was able to get home.
Asked the SA why the mild hybrid electric didn't kick but they couldn't tell me!
Does anyone have any idea why no electric drive capability? Would have thought it would be in gauged for a short period of time.
Asked the SA why the mild hybrid electric didn't kick but they couldn't tell me!
Does anyone have any idea why no electric drive capability? Would have thought it would be in gauged for a short period of time.
Senior Member
Joined: Nov 2007
Posts: 431
Likes: 64
From: Delray Beach, Fl
GLC SUV 350e4 Verde Silver Metallic
Understand what you’re saying but when the car is driving normally and you step on the accelerator the middle hybrid kicks in. I guess what I don’t understand is how that whole thing interacts when the fuel supply is cut off but everything else seems to work!?.
Member
Joined: Apr 2023
Posts: 197
Likes: 50
From: Vermont
2023 GLC 300, 2021 VW ID4
The way I look at it is that almost all hybrid cars that are not plug-in hybrids can not move on their own electric power. Probably because in those cases their batteries are too small.
Junior Member
Joined: Dec 2023
Posts: 41
Likes: 19
2024 GLC300 2025 E450
Junior Member
Joined: Jul 2024
Posts: 20
Likes: 5
From: Washington, DC
GLC300
I think the only exception in the Hybrid world was the GM Voltec setup - the car was powered by the electric motor at all times, however when battery juice ran out the small gas motor kicked in to supply power to the electric motor for propulsion. I think most other hybrids are the opposite where the gas motor is the main driving source getting supplement from battery.
Our GLC300 gets good mileage for ths size vehicle it is so the battery is assisting but Id be curious how best to balance battery usage to get the highest MPG.
Our GLC300 gets good mileage for ths size vehicle it is so the battery is assisting but Id be curious how best to balance battery usage to get the highest MPG.
Member
Joined: Apr 2023
Posts: 197
Likes: 50
From: Vermont
2023 GLC 300, 2021 VW ID4
The good gas mileage is one of the main reasons I bought the GLC.
The upcoming VW Scout is reportedly going to have an optional setup like the Voltec setup, small gas engine charging the electric motor battery.
The upcoming VW Scout is reportedly going to have an optional setup like the Voltec setup, small gas engine charging the electric motor battery.
