GLC Class (X254) Produced 2023+

How I saved over $3,000

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Old Oct 20, 2025 | 07:08 PM
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From: Out Towards Palm Springs
2019 GLC 350e
How I saved over $3,000

Two month ago I was transporting some really wet sod to my house. Yes, I should have had it in a container, thank you. My wife has already yelled at me for that.
Upon turning unto my street and up my driveway, the Sirius station I was listening to went to "service unavailable". I immediately knew I had effed up.

I did a lot of reading and questioning here and on other corners of the internet. I found that the Sirius unit is in the back right corner of the trunk and since I have the Hybrid, the battery is the highest point and all spilled liquid goes right to the back. Bad design.

I called to get a quote from MB... and almost fell over when I hear it. $3200 for a Sirius Sat unit installed.
I looked into a used unit, but MB has a lockdown on installing used ones, as you may know.

So I decided to take the entire thing apart myself.

I removed the trunk lining, side panel lining, unplugged everything back there and finally got to and removed the unit. I opened the unit up and saw corrosion on one if the circuits. I gently brushed that off with a toothbrush and reassembled the unit and the back of the vehicle. I said a prayer and turned the ignition on, switched to Sirius....
AND IT WORKED
Holy S it worked.

Yes I probably could have cleaned it off better or used some spray, but I really didnt think it was going to work.

a big FU to MB and their stupid prices and lockdowns.









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Old Oct 20, 2025 | 08:17 PM
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C280 Sport's Avatar
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Good job! Unfortunately dealerships just want to replace as it’s easier for them instead of fooling around trying to fix it. Always fun when you diy and save $
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Old Oct 20, 2025 | 09:18 PM
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Good job on finding the issue. Corrosion will continue if it is not chemically stopped. You need to use an anti corrosion spray. Also, it's likely that there is a pin that needs some reflowing because just cleaning does not fix anything long term. If you have a thin tip solder iron you can flux and drag it along the pins, or if you have a hot air solderer, flux and flow.
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Old Oct 21, 2025 | 10:51 AM
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Really nice work.
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Old Oct 21, 2025 | 05:25 PM
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MolySlip Combat spray is excellent to protect it.
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Old Oct 21, 2025 | 06:27 PM
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Do you mind sharing pictures of where in the trunk the unit is located? Is the location the same for the 2025 Mercedes GLC 350e? I'm glad to hear that you were able to fix the problem yourself!
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Old Oct 21, 2025 | 09:05 PM
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That is one expensive module not going to lie.
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Old Oct 22, 2025 | 01:14 PM
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That’s awesome, you definitely pulled off a solid save. Feels good beating the system and keeping that $3k in your pocket.
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Old Oct 24, 2025 | 07:47 PM
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From: Out Towards Palm Springs
2019 GLC 350e
Originally Posted by Bwds7
Do you mind sharing pictures of where in the trunk the unit is located? Is the location the same for the 2025 Mercedes GLC 350e? I'm glad to hear that you were able to fix the problem yourself!
Right side up right of trunk floor in the photo
Right side up right of trunk floor in the photo
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Old Oct 24, 2025 | 07:48 PM
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From: Out Towards Palm Springs
2019 GLC 350e
Originally Posted by 404CPE
MolySlip Combat spray is excellent to protect it.
I realized once it actually worked that some day I will need to get back in there and spray it. I’m just so busy that I am riding it until I can or it gives me an issue again.
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