atc789
Member
I was just about to post about this exact issue! I have a 2014 Model S, out of warranty, pre-facelift, with AP1 and about 95,000 km. In retrospect, I was probably having issues for months (slow / sluggish interface and music streaming, internet connectivity dropouts, and voice commands not working) until two days ago my MCU completely failed on me. After trying (but failing) to reboot the MCU, the instrument cluster reset to imperial units, time zone was reset, and I lost all odometer and historical data.
I also had an A/C unit that was permanently on even when it was supposed to be turned off while in the parking lot at work. I had a sneaking suspicion so I went to check the car after a couple hours and noticed that I was losing over 10 km/h of charge. It probably didn't help that it was a really hot and humid day too.
Tesla Toronto confirmed my suspicions about the MCU failure. After complaining about the A/C drain on the battery, they asked me to bring the car to the service centre which was thankfully pretty close by and they were able to fit me in for a quick reset of the car. Took about 20 minutes and now the A/C now shuts off after I leave the car. The car is driveable but I have lost all turn signal functionality plus obviously all other functions controlled by the MCU. I noticed that although the turn signals don't work, the emergency 4 way flashers work. Why are these two functions separated even though they act on the same lights? Also charging rate is reduced to 8A (normally I get 40A) when plugged in at home.
Tesla Toronto is ordering me a replacement MCU which will come in possibly by the end of the week (the quote says a remanufactured MCU #1098010-99-H) for $1310 CAD. $1865 CAD in total including labor and tax. They quoted a 2 year warranty on the replacement. I saw posts about possible 3rd party replacements but since this is my daily driver, I want my car back up and running as reliably and as fast as possible... I was actually expecting to pay more for the replacement MCU but I'm glad that it looks like the costs are coming down.
In the fantastic 5 years that I've had this car, this has been the biggest and most inconvenient issue that I've had with the car....
Does anybody know if this remanufactured MCU has an upgraded eMMC for greater longevity compared to my original MCU? It really sucks to hear about this memory issue and I'm really hoping to be able to drive the car for several more years.
I see NHTSA complaints have been filed, but since I am in Canada is there anything I can do to add my voice to this issue?
Hey mcduck, which service center did you go to? Lawrence @ Railside Road? I'm likely going to need this done as well. Did they give you a price for MCU2 upgrade?