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Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 11:27 am
by Supersleeper
Hi Folks,

Started my morning off with the NissanConnectEV app unable to get a battery status. Not thinking much about it, given the slow and buggy nature, I hopped into the car for the drive to work, and noticed a yellow triangle warning. Ran LeafSpy, and found P312a p3131 u1000. Once I got to work, I shut down, then powered back up. Yellow triangle was gone, but still can’t seem to get a battery status.

After work, I plan to do another diagnostics with LeafSpy, then pull the TCU fuse and see if that makes any difference. Not sure if anyone else has run up against this before? On a seemingly related incident, last week, I ran up on a failed scheduled charge, and had to drive to work knowing I couldn’t make it home. Fortunately we have chargers here at work as well. I haven’t seen the repeat incident of that yet, but when I plug it in, I ALWAYS wait until I hear the clunking of the solenoids before walking away.

Thanks in advance for any guidance or info

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 12:21 pm
by GerryAZ
Yes, failure to update status or send charge complete messages are first clues that TCU is locked up. EV light goes out after driving, but it generally takes clearing DTCs, pulling fuse, and clearing DTCs again to completely cure my 2015. I have done it perhaps a half dozen times since getting TCU upgrade in December 2016.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 12:30 pm
by jlv
Supersleeper wrote:Not sure if anyone else has run up against this before?
Those set of DTC are indicative of the TCU locking up, which is backed up by you being unable to get battery status. Many, MANY people have run up against this; e.g. http://mynissanleaf.com/viewtopic.php?f ... 28#p486228

Definitely pull the TCU fuse and then clear the DTCs with Leaf Spy pro.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 2:12 pm
by cwerdna
Yes. Fuse pull when the TCU stops responding to commands and queries.

After clearing P3131 via Leaf Spy Pro, to help mitigate the stupid yellow ! car and P3131 from coming back, do what I do at http://www.mynissanleaf.com/viewtopic.p ... 24#p515624. It seemed to help this guy: http://www.mynissanleaf.com/viewtopic.p ... 73#p516373.

I really wish Nissan would fix this crap.

I think I’ve gone many months now with a yellow ! car and P3131 ever since doing this. The TCU bad state/lockups still happen every now and then, but I do like being able to query charging status, receive charging complete notifications and send the commands.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 7:27 pm
by Supersleeper
Pulled fuse twice for 3 SEC each time. No dice. It can communicate from the car out, but not from the app in. Now has P31C2. This looks new.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 8:46 pm
by GerryAZ
Supersleeper wrote:Pulled fuse twice for 3 SEC each time. No dice. It can communicate from the car out, but not from the app in. Now has P31C2. This looks new.
Once in a while, I have to disconnect the negative 12-volt battery cable. I have also pulled another fuse (related to the navigation/radio system along with the 20-ampere fuse that supplies the TCU. Also, try leaving the fuse out for longer time.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Wed Mar 07, 2018 9:45 pm
by Supersleeper
GerryAZ wrote:
Supersleeper wrote:Pulled fuse twice for 3 SEC each time. No dice. It can communicate from the car out, but not from the app in. Now has P31C2. This looks new.
Once in a while, I have to disconnect the negative 12-volt battery cable. I have also pulled another fuse (related to the navigation/radio system along with the 20-ampere fuse that supplies the TCU. Also, try leaving the fuse out for longer time.
I meant to say 30 SEC. Anyway, had to pull the negative terminal, and resolved it instantly.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Thu Mar 08, 2018 9:51 am
by jlv
Supersleeper wrote:Now has P31C2. This looks new.
P31C2 is also part of the problem (listed in the link I posted above).

Glad it's working for you now, but it's interesting that you needed to pull the negative terminal to get it to resolve. Are you getting text messages/notifications (on charging complete)?

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Fri Mar 16, 2018 10:41 am
by RelaxedGal
Weirdly, the fix recommended by my dealership was to uninstall and reinstall the NissanConnect EV & Services app on my Android phone. And that worked. Both times that I needed to do it.

For me the yellow triangle and car-with-exclamation-point were coming on every time I started the car after the car was supposed to notify me ; e.g. charge complete, or parked near a charger and not plugged in.

Re: Yellow triangle light and P312a p3131 u1000 codes

Posted: Fri Mar 16, 2018 5:31 pm
by cwerdna
RelaxedGal wrote: For me the yellow triangle and car-with-exclamation-point were coming on every time I started the car after the car was supposed to notify me ; e.g. charge complete, or parked near a charger and not plugged in.
Try http://www.mynissanleaf.com/viewtopic.p ... 24#p515624. It's helped me. It seems to have also helped http://www.mynissanleaf.com/viewtopic.p ... 73#p516373.