Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

2015 Model S 85D MCU 1. 2020.36.31 update installation stuck at 80%

May 13, 2019
495
1,571
Raleigh, NC
I would think to just let it sit for a while has it been 1 hour since you started the upgrade? 2 hours?

i think the last time I did mine (2016 90D AP1/MCU1) it was stuck on 90% for longer than I would have thought was normal. I didnt time it but I think it went pretty quick and then stuck on 90% for 30-45 minutes.
 

T3MTLCanada

Member
Nov 22, 2017
32
11
Montreal
I had to reboot twice and now I got MCU back so now I can’t give the car. But when I check for update it said no update. I’m still on 2020.36.

my car got some error like
Software update require contact Tesla and
Center display unavailable. Driving and user setting cannot be restore.

I try to drive the car and still work.
 

T3MTLCanada

Member
Nov 22, 2017
32
11
Montreal
After couple of test,

the map work, all setting work on the MCU.
What not working is I can’t use the scroll wheel on the right side. the 3G is disable but wifi work.

Tesla only open on Monday.

I’ll call in first to push the update again so I can reinstall it first.

i believe the MCU Was change last year because of the bubble on the side.
 

themacs

Member
Nov 28, 2014
113
12
san clemente, CA
Hi
My 2015 Model S 85D MCU 1. 2020.36.31 update installation stuck at 80%.

Is it save to reboot it ?

It happened to me about 7 weeks ago. Tesla towed the car in and "re did" the update installation. All was fine. Then 6 weeks later all went black again. They towed it in again and replaced the daughter board. I just got it back last Night. We will see.
 

Spacey73

Member
Nov 2, 2019
255
246
United Kingdom
After couple of test,

the map work, all setting work on the MCU.
What not working is I can’t use the scroll wheel on the right side. the 3G is disable but wifi work.

Tesla only open on Monday.

I’ll call in first to push the update again so I can reinstall it first.

i believe the MCU Was change last year because of the bubble on the side.
Damn this is exactly what mine is doing, 4 times they have sent me the update and it gets stuck at 80%

Just had CCS upgrade last week so I thought it might be something to do with that. Had my suspicions that the MCu is on its way out S85 Dec 2014
 

T3MTLCanada

Member
Nov 22, 2017
32
11
Montreal
They repush the update today and the update when fine and complete everything. Only issue now is the 3G that doesn’t work. bar signal with a slash through it

First time the 3G issue happen when it fail the software update and when reboot it was like that.
SC will check what happen.

No idea how much that can cost to fix it.
 

98ramair

P85D
Oct 2, 2019
18
7
Massachusetts
Hi, similar but different issue with the 80% update. I have a 2015 P85D with 48k miles.

Car went into service center for a door handle replacement and was there over a week. The SC kept saying they "were having an issue" with the software update and the mothership was involved. Finally got the call that software update took place and my car was ready.

Fast forward a week. I got another software update and it stuck at 80% and received the same message "Software update needed, call service". I opened a service request and a few days later a new software update was sent and WORKED! However, after that update I lost 3g connectivity. Back to the app to open another request.

I got an email yesterday and they ordered the 4g upgrade kit to solve the issue of no 3g connectivity.

If this is indeed the signs of a failing MCU1 then I guess I am on borrowed time.

upload_2020-10-7_9-29-31.png
 

Spacey73

Member
Nov 2, 2019
255
246
United Kingdom
I have had the same thing, 7 attempts now and a service center visit to reset the 12v whatever that means, and every tiume the update freezes at 80%.

No satnav on driver console, no 3g and half the functions like volume control and temp readout are completely messed up. It was not this way before I had the mobile CCS upgrade done last month. They want me down for another diagnostic (was a 5hr wait last time in a small room) now it's a 1st thing in the morning and could be all day.

I've basically just said can we skip the diagnostics and just install a new motherboard as MCU memory chip has to be on its way out.

Looks like they are ordering the part.

Funny thing though whilst supercharging...my screen went all funny and then the 3G started working?
20201007_190836.jpg
 

Jamesus

Member
Feb 18, 2019
61
24
CA
I had this exact same issue with my 2015 70. I tried using different internet connections, hotspots, rebooting, and nothing worked. I scheduled a service request and a remote tech pushed a new update and reset something in my MCU.

The update worked but the following month I got signs of a failing MCU (e.g. no video feed from the reverse camera when backing up, internet losing connection when using nav, MCU not responsive, etc.). My car is now getting diagnosed at the SC.
 

T3MTLCanada

Member
Nov 22, 2017
32
11
Montreal
It's strange we all have same issue.
I didn't want to believe it was Daughter board issue or the 3G module.
Heck it work prior to 2020.36.31 with no issue at all.
I believe is the software update that cause all this issue. When the software update failed at 80% and reboot the MCU, i believe some stuff did not install correctly like the 3G, the temps reading, the MAP on the IC doesn't move, right scroll doesn't work well to change temperature, those Artifact (weird graphic on the MCU).
Anyways, they receive my part and my appointment is this Saturday and they will borrow me a rented loaner for the day.
cost to replace the Daughter board and change to LTE and labor: 600$ CDN tax inc.
 

PWlakewood

Active Member
Jan 9, 2019
1,721
879
US
We just picked up an S for my wife that had 3g and it worked for a week then when there was an update available it got stuck at 80% then after hours of waiting and many reboots later the 3g would not come back and the update would not finish. The tech I talked to at telsa said there was an error and the 3g modem was not responding anymore. We just said screw it and did the LTE upgrade sooner than planned and now everything is back to normal.
 

98ramair

P85D
Oct 2, 2019
18
7
Massachusetts
It is very interesting that this is happening to multiple vehicles after a software update and the solution seems to be upgrade to 4g and not fix the software problem itself. I would be curious to see how many vehicles still have 3g service as of today. Perhaps Tesla wants out of the 3g contract they are in and this is a way out!!
 
  • Like
Reactions: Georgeyang

PWlakewood

Active Member
Jan 9, 2019
1,721
879
US
It is very interesting that this is happening to multiple vehicles after a software update and the solution seems to be upgrade to 4g and not fix the software problem itself. I would be curious to see how many vehicles still have 3g service as of today. Perhaps Tesla wants out of the 3g contract they are in and this is a way out!!
I thought I read somewhere 3g was ending in 2022.....of course tesla is causing these issues to force everyone to do the upgrade....tesla is known for these type of shenanigans so no one should be surprised. The only thing that bugs me is were on the mcu2 upgrade list and that comes with lte so we basically did the lte upgrade just so we can have connectivity until they replace our mcu. So 350 bucks down the drain
 

Georgeyang

Member
Jul 13, 2020
7
0
San Ramon
It is very interesting that this is happening to multiple vehicles after a software update and the solution seems to be upgrade to 4g and not fix the software problem itself. I would be curious to see how many vehicles still have 3g service as of today. Perhaps Tesla wants out of the 3g contract they are in and this is a way out!!
My 2015 car is same as
 

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top