Sunroof Stuck in Closed Position
Thread Starter
Newbie
Joined: Feb 2024
Posts: 6
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C63S Coupe - Edition 1
Sunroof Stuck in Closed Position
Hi All,
I recently purchased a 2017 C63S Edition 1 Coupe. The seller failed to disclose that the sunroof didn't open (I know, should have asked and checked). Now that the water is under the bridge, I am attempting to fix this myself...
Background:
When attempting to open the sunroof, the FRONT will lift and then subsequently go down. I assume this is due to the rear not lifting before hand, triggering an error and putting the sunroof back to the 'safe' closed position. I am a very avid DIY-er and have done plenty of projects myself before (engine and transmission replacements, clutches, brakes, suspension, subframes, etc.) to which I consider myself an experienced wrench. So I do think job may be within my scope of capabilities. However, this is my first German car.
Currently: I am at the point of attempting to manually open the sunroof - I have gotten to the sunroof motor and am attempting to open it by twisting the 4mm hex input inside of it. Where I am getting suck is that the rear will NOT raise. I tried with some plastic pry tools wedged on the outside and working it back and forth... no luck.
I pulled a buddy into this to see if he can push up while I twist - no luck either. I am faced with extreme resistance at the motor when attempting this, to which I assume is where I should not torque any further.
Overall Objective:
Does anyone have any advice or tips for opening a sunroof/panoramic roof that is stuck in the CLOSED position?
I already have the replacement parts and just need to physically open the roof to access the rails. Also, in terms of programming, I have that covered too (aka I am trying to avoid the dealership at all costs).
I recently purchased a 2017 C63S Edition 1 Coupe. The seller failed to disclose that the sunroof didn't open (I know, should have asked and checked). Now that the water is under the bridge, I am attempting to fix this myself...
Background:
When attempting to open the sunroof, the FRONT will lift and then subsequently go down. I assume this is due to the rear not lifting before hand, triggering an error and putting the sunroof back to the 'safe' closed position. I am a very avid DIY-er and have done plenty of projects myself before (engine and transmission replacements, clutches, brakes, suspension, subframes, etc.) to which I consider myself an experienced wrench. So I do think job may be within my scope of capabilities. However, this is my first German car.
Currently: I am at the point of attempting to manually open the sunroof - I have gotten to the sunroof motor and am attempting to open it by twisting the 4mm hex input inside of it. Where I am getting suck is that the rear will NOT raise. I tried with some plastic pry tools wedged on the outside and working it back and forth... no luck.
I pulled a buddy into this to see if he can push up while I twist - no luck either. I am faced with extreme resistance at the motor when attempting this, to which I assume is where I should not torque any further.
Overall Objective:
Does anyone have any advice or tips for opening a sunroof/panoramic roof that is stuck in the CLOSED position?
I already have the replacement parts and just need to physically open the roof to access the rails. Also, in terms of programming, I have that covered too (aka I am trying to avoid the dealership at all costs).
Newbie
Joined: Apr 2024
Posts: 1
Likes: 0
2017 Mercedes-Benz C300 Sedan
I am currently in the exact same situation as you. I'm a tech myself and trying to fix my sunroof in my 2017 C300, I have my head liner fully removed, I have messed with the motors, removed the motor and even tried to use a pocket screwdriver to push the one side of the teeth that the motor contacts. while having someone lift from the inside, glass won't budge and from what I can see you can't remove the glass or rails without the glass lifting up. Did you happen to figure it out? I'm about to just give up on it and put the head liner back in, only way I see this happening is by breaking and replacing the pano glass.
Any advice would be appreciated.
Any advice would be appreciated.
Member
Joined: Apr 2017
Posts: 185
Likes: 36
From: San Diego
C63S Coupe/CLA45
I am currently in the exact same situation as you. I'm a tech myself and trying to fix my sunroof in my 2017 C300, I have my head liner fully removed, I have messed with the motors, removed the motor and even tried to use a pocket screwdriver to push the one side of the teeth that the motor contacts. while having someone lift from the inside, glass won't budge and from what I can see you can't remove the glass or rails without the glass lifting up. Did you happen to figure it out? I'm about to just give up on it and put the head liner back in, only way I see this happening is by breaking and replacing the pano glass.
Any advice would be appreciated.
Any advice would be appreciated.
Newbie
Joined: Nov 2023
Posts: 1
Likes: 0
2017 Mercedes-Benz c300
What I’m wondering same at the thread opener is, if there is a way to manually open the pano glass with one side being stuck closed.
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Newbie
Joined: Jan 2022
Posts: 4
Likes: 0
From: San Carlos, CA
2017 Mercedes AMG C63s Sedan
I am having the exact same problem (glass will partially open and lift on one side but not the other and then close itself) and I have tried having one person push the stuck side up from inside while another pulls from the top using a glass suction cup. It will not budge. I feel like it will break something more costly if we apply any more force, although the MB dealer quoted me $4,500 to replace the rails so I'm not sure how much more expensive it could get. 
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Member
Joined: Apr 2017
Posts: 174
Likes: 60
From: Miami
C63s Sedan
Welp add me to the list.
My sunroof wouldn't close all the way so I push the back parts in and now it wont open.
Then again I would rather have it closed than open with the constant raining in Miami.
Guess I will be forking over that $2,000-3,000 to Mercedes pretty soon.
My sunroof wouldn't close all the way so I push the back parts in and now it wont open.
Then again I would rather have it closed than open with the constant raining in Miami.
Guess I will be forking over that $2,000-3,000 to Mercedes pretty soon.
Newbie
Joined: Nov 2024
Posts: 1
Likes: 0
I am having the exact same problem (glass will partially open and lift on one side but not the other and then close itself) and I have tried having one person push the stuck side up from inside while another pulls from the top using a glass suction cup. It will not budge. I feel like it will break something more costly if we apply any more force, although the MB dealer quoted me $4,500 to replace the rails so I'm not sure how much more expensive it could get.
Member
Joined: Sep 2018
Posts: 108
Likes: 7
C43. GS-T Spyder. 20th AE GTi.
Has anyone found a fix for this? The passenger rear corner of my sunroof will not budge. It made a crunching noise randomly once when closing and I thought something had gotten stuck in the front of the glass when closing and didn't think much of it. Opened again as normal following that and the next time I closed it, made a lesser crunch and closed properly. Now the passenger rear corner will not move. The drivers rear corner lifts up just fine but I cannot for the life of me figure out why the one corner is stuck.
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