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Most cost effective instrument cluster and MCU1 repair/upgrade

Hi guys! My first post here. Just recently got a '15 MS 85 and started going through it so I'm excited. One thing I see I need is an instrument cluster screen because of glass delamination. From what I read so far, an MCU upgrade also gets you the displays replaced @ $2k or $2.5k total. My main display is still ok. I think it has a little of the side yellow bars, but not terrible. Sounds like it's better to have the eMMC fixed or MCU upgraded sooner rather than later.

My question is what's better/possible:
1. Tesla MCU upgrade which gets me new displays for $2-2.5k or
2. Get used cluster screen ($100ish) and fix eMMC/get used MCU2 ($???)

What I don't know is what it takes or if it's even possible to get a used MCU2 and make it work.

Any info is greatly appreciated.
 

Aggmeister2010

Active Member
Dec 26, 2018
1,172
1,052
TX
MCU1 and MCU2 are not plug-and-play. You cannot upgrade it yourself without EXTENSIVE modifications and programming. It's not worth it to do on your own, Tesla's in-house price is actually pretty good for that.

FYI, it's only $1750 for you because you don't have AP2.

I believe the instrument cluster screen is plug-and-play. If you're comfortable replacing the eMMC on your own you can, but it's a bit of a process as well. I believe they have a free recall to do it, though, might want to call your service center to check first.
 
Really appreciate your reply. So $1750 gets me MCU2 and instrument and main displays? I haven't been able to add the car to my account yet so I can ask directly.

And cluster plug-and-play was another question I had. Worst case, I think I can use the LCD of a used one on my original PCB.
 
Last edited:
Really appreciate your reply. So $1750 gets me MCU2 and instrument and main displays? I haven't been able to add the car to my account yet so I can ask directly.

And cluster plug-and-play was another question I had. Worst case, I think I can use the LCD of a used one on my original PCB.
Yes, the MCU2 upgrade includes replacing both the main screen and the instrument panel display.

With MCU1, the instrument panel has it's own processor. That's where you can reset the instrument panel using the two buttons above the scroll wheels independently of resetting the main screen with the two scroll wheels.

With MCU2, the instrument panel is a secondary display off of the main MCU2 processor and screen. That is why when you get the MCU2 replacement of the main screen, they must replace the instrument panel from your original MCU1 setup in combination with the MCU2 main screen. You cannot mix-and-match the IP and main displays between MCU1 and MCU2 systems.

So, you could go ahead replace the IP with a used one. Do just the eMMC replacement for your MCU1. But if your MCU1 would need to be replaced in the future, or you'd elect to do the MCU2 upgrade, you'd be replacing the IP again a second time.
 
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I'll probably start with replacing the cluster and see if I can get the eMMC replaced under the recall. If I decide later to upgrade the MCU, I would just be out and extra $100ish for the cluster but not have to look at glue stripes untill then. Thanks, guys!
 

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