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Help! Multiple errors on 2013 S: steering assist reduced, Traction Control disabled, stability control disabled, parking brake requires service

Nov 8, 2017
45
43
FL
While turning onto on on ramp I suddenly got multiple error codes:

Steering assist reduced
Traction control disabled
Stability Control disabled
Parking brake requires service
Regenerative braking disabled

With all these faults the car is difficult to drive. I did a reset when this first came up and was able to drive all the way home another 20min without problems. The next day it all pops up again. A hard reset got rid of it but only for a few moments.

I disconnected the 12v battery and checked the voltage there it was just over 13v so seems to be no issue. I was thinking to check the wheel speed sensor wires for breaks. Is there something else I should look at? I am a bit stumped here.

I have seen similar posts but haven't seen a fix to the issue.
 

rooter

Member
May 13, 2018
733
905
Edmonds, WA
It's possible you have a broken ground stud. This is a common problem in cars built before 2016.

Under he frunk on the inside of the right frame rail is a ground stud. Overtorqued at the factory they eventually break off. You have to drill and tap the hole to install a new stud, with NoAlOx due to dissimilar metals.
 
  • Informative
  • Helpful
Reactions: All In and bmah
Nov 8, 2017
45
43
FL
It's possible you have a broken ground stud. This is a common problem in cars built before 2016.

Under he frunk on the inside of the right frame rail is a ground stud. Overtorqued at the factory they eventually break off. You have to drill and tap the hole to install a new stud, with NoAlOx due to dissimilar metals.
Thanks I will look.
 
Nov 8, 2017
45
43
FL
So it appears now to be a bad 12v battery. Once I let it sit without the cables attached it showed very low voltage. I’ll replace it and see if the problem goes away.
 

EZBoy

Member
Sep 30, 2019
84
23
Toronto
I wanted to give the same advice:) check your ground studs ! One is on the passenger side beside the ac piping under the hood, another one is under airbag controller under the mcu inside. I would say 90% is the under the hood one that gives trouble. When checking it, make sure you actually unscrew it and clean it, don’t just rely on visual inspection. That mistake cost me dearly
 
Nov 8, 2017
45
43
FL
Turns out the battery was actually good the voltage where I probed it showed low because the posts were corroded. It was either corroded 12V battery posts or the ground on the battery tray was also corroded. I cleaned it all up and put it back together so far so good.
 
Oct 10, 2019
319
158
So-Cal
I had the same thing happen when I was returning to my lane after passing on a split yellow with snow groves for the reflectors. I hit one while turning into my lane and all those errors came up and my PS didn't work so I had to drive 2 hr like that.
The fix was one that I've done before when *sugar* breaks without actually breaking.

Disconnect the ground on the 12v battery then unplug the fireman's loop, let it sit for like 30 min. Then put back together in reverse. Everything works great and no errors anymore.
Did the same thing when my AC compressor went out. If a brake pedal reboot doesn't fix it this usually does. If still not fixed though then you likely actually have something broken and gotta go see Tesla for a diag.
 

lomed77

Member
Jul 21, 2019
16
10
New fairfield ct
currently in the same boat with my 2019sr plus. tesla has it. they had it last week and said it was an alignment issue. did the alignment and worked great until i got the 2021.4.18 update then i got the errors again.
 

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