What should I expect from a MCU replacement?

[xsi123]

A couple of times in the last few weeks I got message: "Systems are powering up..." and nothing else was happening. Reboot (sometimes multiple reboots), fixed the issue but after a few days it came back.

Service Center says that my Dec 2016 S 75D needs MCU replacement and they will do it (under warranty).

What should I expect or what should I check after the replacement? Anyone with experience on this? Any horror stories?

 

[gjunky]

Curious to see if they replace it with an MCU1 or MCU2 (the newer version, not sure what they are actually called). Should give you a good performance improvement if they use the newer one (I am assuming you have an MCU1)

 

[ucmndd]

Expect a new MCU that hopefully doesn't have the issues of the old one.

Definitely don't expect a MCU2 replacement for your MCU1 unit like the poster above suggests might happen, because it certainly won't.

Look for trim alignment and damage after the replacement. That's about it.

 

[Krash]

If you like the new darker (carbon) trim, your service center might swap the adjoining silver parts for you if you buy the new carbon parts. I did just the MCU bezel and love it. Wish I had done the vents and intrrument cluster bezel.

 

[xsi123]

MCU replaced. Part number and description (according to the invoice) is: MCU NA PREMIUM MODEL S/X (1045006-00-D)

 

[ahkahn]

MCU replaced. Part number and description (according to the invoice) is: MCU NA PREMIUM MODEL S/X (1045006-00-D)

So is that an MCU1 or MCU2? I am having a similar problem, intermittent, but have a service appt in a couple of weeks. They did not want to remotely fix the problem, as it could brick the car. Car drives fine, but MCU is very slow and needs reboots. They told me the processor is constantly crashing behind the scenes...

 

[JoeMartin]

Mine is actually in the SC currently for replacing the MCU, as mine completely failed. Went completely dark. 2014 MS P85. I'll update if they keep me on MCU1 or upgrade me to MCU2.

 

[xsi123]

... So is that an MCU1 or MCU2? ...

How do I check?

 

[ucmndd]

If you had MCU1 prior to replacement, you have MCU1 after. There is no mystery.

 

[onautopilot]

When mine was replaced my remote unlock and keyless driving (via iPhone app) stopped working. I would recommend you test it before you accept the vehicle back from them. You will also have to reprogram all your personal settings.

 

[animorph]

I had to re-enter all my settings as well. It took a few days to get back to normal.

 

[Lifeinabox]

They scratched my bezel during the MCU replacement. Had to take it back to replace the bezel.

 

[Jan Fiala]

All the failed MCUs were replaced in warranty or against payment?

 

[JoeMartin]

Currently mine is being replaced under warranty.

 

[Lifeinabox]

Mine under warranty.

 

[xsi123]

All the failed MCUs were replaced in warranty or against payment?

2 years old, 20K miles here. Everything covered under warranty

 

[Lloyd]

My MCU got upgraded when my screen was replaced.

 

[MP3Mike]

My MCU got upgraded when my screen was replaced.

Upgraded to what? Are you talking LTE or MCU2?

 

[MP3Mike]

All the failed MCUs were replaced in warranty or against payment?

No. All failed MCUs were not replaced under warranty or payment. There have been both. (If your car is out of warranty it will cost ~$2,500 to get the MCU replaced.)

 

[Lloyd]

Upgraded to what? Are you talking LTE or MCU2?

MCU2, already had LTE