GLC'23 check engine light is on
Newbie
Joined: Mar 2025
Posts: 1
Likes: 0
Had my GLC for about 6 months and only has 2000 miles on it, but the check engine light came on 3 weeks ago. I called Mercedes and they said it could because of a lose gas cap and asked me to tighten it. The light stayed on another few days, then I called them again, the light disappeared. Feels like they can clear the engine light remotely...
But after a few days, the light turned on again. This is so annoying... Mercedes made an appointment for me in a about a month and they said it's safe to drive with the check engine light on... Disappointed.
Is it common to have check engine light on on a Mercedes? I haven't seen this light for almost 10 years when I drove a Honda.
But after a few days, the light turned on again. This is so annoying... Mercedes made an appointment for me in a about a month and they said it's safe to drive with the check engine light on... Disappointed.
Is it common to have check engine light on on a Mercedes? I haven't seen this light for almost 10 years when I drove a Honda.
Member
Joined: Feb 2023
Posts: 82
Likes: 25
From: Suburban Chicago in Illinois
2024 GLC-300 & 2022 GLE-350
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.
Next, I need to find out how to keep the parking brake from engaging every time we put the car in park. That loud "BANG!" noise when putting the GLC300 in gear and pressing the accelerator (Drive or Reverse) after a rain or carwash the prior day/night is annoying and worrisome. No car (let alone a Mercedes!) should go BANG! when attempting to move it forward or reverse. Mercedes says some cars parking brakes stick to the rotors when drying out. No fix planned. I'm going to keep talking about it across social media until Mercedes feels a little heat about this. (I'm retired now, so I can be a full time consumer advocate, or Azzhole, depending on what's needed, LOL.)
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
No more problems with the Check Engine Light (CEL) since getting "Service A" (9,500 miles) performed in mid February 2025. Maybe a software update was pushed out to the car. My Mercedes tech said a software solution was being worked on, due to so many complaints about the CEL.
Next, I need to find out how to keep the parking brake from engaging every time we put the car in park. That loud "BANG!" noise when putting the GLC300 in gear and pressing the accelerator (Drive or Reverse) after a rain or carwash the prior day/night is annoying and worrisome. No car (let alone a Mercedes!) should go BANG! when attempting to move it forward or reverse. Mercedes says some cars parking brakes stick to the rotors when drying out. No fix planned. I'm going to keep talking about it across social media until Mercedes feels a little heat about this. (I'm retired now, so I can be a full time consumer advocate, or Azzhole, depending on what's needed, LOL.)
Next, I need to find out how to keep the parking brake from engaging every time we put the car in park. That loud "BANG!" noise when putting the GLC300 in gear and pressing the accelerator (Drive or Reverse) after a rain or carwash the prior day/night is annoying and worrisome. No car (let alone a Mercedes!) should go BANG! when attempting to move it forward or reverse. Mercedes says some cars parking brakes stick to the rotors when drying out. No fix planned. I'm going to keep talking about it across social media until Mercedes feels a little heat about this. (I'm retired now, so I can be a full time consumer advocate, or Azzhole, depending on what's needed, LOL.)
Newbie
Joined: Aug 2025
Posts: 5
Likes: 0
GLC’22 check engine light
Sitting at MB now for 5th time bc check engine light on again. Still under CPO warranty but at 45k so only 5k left on warranty. And feel under the gun that mechanics figure out what the cause is before warranty expires. Perhaps I need to find fine print on a problem that MB is not able to solve while under warranty and what happens when warranty expires ie are they still obligated to fix once a fix is determined. Sigh. Thoughts from MB mind hive??
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
Sitting at MB now for 5th time bc check engine light on again. Still under CPO warranty but at 45k so only 5k left on warranty. And feel under the gun that mechanics figure out what the cause is before warranty expires. Perhaps I need to find fine print on a problem that MB is not able to solve while under warranty and what happens when warranty expires ie are they still obligated to fix once a fix is determined. Sigh. Thoughts from MB mind hive??
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Senior Member
Joined: Nov 2007
Posts: 431
Likes: 64
From: Delray Beach, Fl
GLC SUV 350e4 Verde Silver Metallic
Sitting at MB now for 5th time bc check engine light on again. Still under CPO warranty but at 45k so only 5k left on warranty. And feel under the gun that mechanics figure out what the cause is before warranty expires. Perhaps I need to find fine print on a problem that MB is not able to solve while under warranty and what happens when warranty expires ie are they still obligated to fix once a fix is determined. Sigh. Thoughts from MB mind hive??
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
Thanks for following up for us, it is not important for you to know what codes it is but was hoping if you post it, maybe forum members can start helping with the diagnostics and hopefully find the issue. The thing about MB dealerships is that they aren't created equal so I guess if one isn't as helpful, another one might be.
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
Other forum members that have access to TSBs can then look up the database and see if the reported codes in your vehicle was explained in one of those TSBs (XENTRY TIPS) along with a step by step remedy of the issue, hopefully.
Newbie
Joined: Aug 2025
Posts: 5
Likes: 0
Ah of course. Funny thing as to the other comment by DESAL, I only rcvd paperwork once out of the 5x I went in for CEL. On that service document it states the code as P04567A. Tech noted: followed guided test, checked gas cap and gas cap was put on correctly/tight. Followed guided test further, leak checked fuel tank and ok at this time. Coded ME and cleared all fault codes as per guided test. Disconnected SDS and battery maintainer, test drove 5 miles and no MIL (their acronym for check engine light) back at this time.
MBWorld God!
Joined: Dec 2019
Posts: 32,347
Likes: 6,320
Ah of course. Funny thing as to the other comment by DESAL, I only rcvd paperwork once out of the 5x I went in for CEL. On that service document it states the code as P04567A. Tech noted: followed guided test, checked gas cap and gas cap was put on correctly/tight. Followed guided test further, leak checked fuel tank and ok at this time. Coded ME and cleared all fault codes as per guided test. Disconnected SDS and battery maintainer, test drove 5 miles and no MIL (their acronym for check engine light) back at this time.
