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NHTSA Investigates Failing MCUs
- Thread starter 2101Guy
- Start date
MS85DAnthony
Member
When my MCU died, my AC also stayed on. For me taking out the MCU fuse for 30 seconds turned off the AC.
ilovemycoffee
MS 85D HW1 Late 2015
Thanks for the suggestion. Unfortunately I can’t find the MCU fuse. Here’s my fuse box layout Tesla Model S (2015)- fuse box diagram - Auto Genius
ilovemycoffee
MS 85D HW1 Late 2015
Tesla Service contacted me soon after my previous post, and found an opening for the car at the service center Monday morning. They asked me to shut the climate control remotely, but no dice. Hope the fan survives this
MS85DAnthony
Member
Yup it’s that one. Just take it out for 30 seconds and you should hear the the AC compressor turning off while the fuse is out.
jpvdheijn
Active Member
No this is not the replacement of the MCU. This the actual board failing in de MCU. This kind of repair is what tesla should have started out from to begin with. The rest of the unit is fine this board is the weak link. Good that they are addressing the faulty part. If you got your MCU replaced then your whole assembly was replaced so therefore the cost is higher.
Well it really isn't the same thing, and you wouldn't get an upgrade for 3G as part of the new fix. (Or a new screen like you would have gotten.)
tmyl21
Member
Is Tesla replacing the EMMC card or daughterboard for under $500 now to fix the issue as opposed to replacing the entire MCU ?
They are replacing the daughterboard, on which the eMMC is installed.
It's the Tegra daughterboard, and the total cost is $490 part+labor. Tesla Service confirmed they'll do that if only my daughterboard is bad on my MCU when I bring it in next week. Otherwise they'll replace with a reman MCU for $950+labor.
It seems unlikely it's the entire MCU.
It seems unlikely it's the entire MCU.
dgpcolorado
high altitude member
I wonder what sort of chip is on the daughter board? If it is the same type and size that's not much of an improvement.
I don't know the answer to this question, and I'm guessing we won't know until someone takes it apart and checks for us. But my understanding is that it should last significantly longer since Tesla has updated firmware to reduce writes. They seemed to be writing indiscriminately to it in the past.
aesculus
Still Trying to Figure This All Out
secobarbital
Member
I also just got a quote for replacing the daughterboard. Same part number but asking $696.30. This is in the SF Bay Area.
I am asking if it is possible to do under warranty since it died the month after its 4th birthday
My estimate is from San Rafael, FYI. And good luck with the warranty claim; mine died 3 months after it's 4th birthday..
dgpcolorado
high altitude member
I don't trust that the logging changes are enough. My current MCU is two and a half years old. I've stopped streaming. I've stopped traffic. I keep the map zoomed way out so it doesn't have to paint very much and only use nav on road trips. Hoping to keep mine alive until I can make a trip to Orange County to EVfixme for a proper repair. (Hard to make that trip safely in the era of coronavirus.)
Having the MCU die when I live 300 miles from a service center is a PITA (think: long, expensive flatbed tow). Having it die on a road trip would be worse!
secobarbital
Member
As you predicted, they were not willing to put it under warranty, but she offered to waive the labor fee, and quoted $410 for the part. I sent her the bill attached to an earlier post showing $120 for the part and, after asking management, she was able to match that for a total of $130.80!
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