cmgolden
Posts: 2
Joined: Thu Dec 07, 2017 10:39 am
Delivery Date: 15 Dec 2013

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Thu Dec 07, 2017 10:46 am

I have a 2013 LEAF with the 3G TCU upgrade and am also experiencing the frequent 12V battery drain.
Has anyone heard of a successful resolution? E.g. replacing the TCU again and lucking onto a 3G unit that works? Or Nissan resolving the issue in some fashion (short of just disabling the 3G/TCU)? Does anyone have a 2013 with a 3G TCU that doesn't cause this 12V issue?

One day customer service tells me this is a known problem and to wait for an engineering solution and then next they say I should bring it into the dealership to troubleshoot and deny it's a known/broad issue. I'm confused.

P.S. My brother-in-law has a Model 3 reservation he's looking to unload. I'm seriously considering picking that up. But what resale value does a 2013 LEAF have with a malfunctioning TCU?

cwerdna
Gold Member
Posts: 7269
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Fri Dec 08, 2017 12:46 am

cmgolden wrote:I have a 2013 LEAF with the 3G TCU upgrade and am also experiencing the frequent 12V battery drain.
Has anyone heard of a successful resolution? E.g. replacing the TCU again and lucking onto a 3G unit that works? Or Nissan resolving the issue in some fashion (short of just disabling the 3G/TCU)? Does anyone have a 2013 with a 3G TCU that doesn't cause this 12V issue?

No. But, you could pull the fuse when the TCU seems to get stuck and stops communicating. That might help prevent the drain.

I do charge my 12 volt battery at least once a week with my Tecmate Optimate 4 charger so that help prevent the 12 volt from going flat. I think in the time I've had the (buggy) 3G TCU upgrade, I've only had 1 very low 12 volt voltage incident. My 3G TCU started working around May 2017 (viewtopic.php?p=494729#p494729). Let's just say I had a rocky start with it.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

lorenfb
Posts: 1407
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Fri Dec 08, 2017 5:33 am

cwerdna wrote:
cmgolden wrote:I have a 2013 LEAF with the 3G TCU upgrade and am also experiencing the frequent 12V battery drain.
Has anyone heard of a successful resolution? E.g. replacing the TCU again and lucking onto a 3G unit that works? Or Nissan resolving the issue in some fashion (short of just disabling the 3G/TCU)? Does anyone have a 2013 with a 3G TCU that doesn't cause this 12V issue?

No. But, you could pull the fuse when the TCU seems to get stuck and stops communicating. That might help prevent the drain


Or just stop using the TCU functions! I don't use it except for updating charging locations and NEVER have had any battery problems or a need to pull a fuse.

dudleypippin
Posts: 3
Joined: Mon Feb 13, 2017 6:11 am
Delivery Date: 13 Feb 2017
Leaf Number: 409255

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Fri Dec 08, 2017 7:24 am

Just off of live chat with an EV rep after my 2013 needed a hard reboot and subsequent jumpstart:

The 12V battery drain concern is a known concern and Nissan is working on a fix. Unfortunately, until the patch has been released, all we can do is tell you to either jump start the vehicle when needed, or take the vehicle to the dealership and have them turn off the TCU until the fix has been implemented.


He couldn't give me any reference number, but said I'd receive postal mail when there was a fix.

As a computer geek, I love that this is a "patch". We really are just driving computers with wheels these days.

LeftieBiker
Posts: 7402
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Fri Dec 08, 2017 2:09 pm

"Jump start the vehicle when needed" is terrible advice. It's a recipe for a truly dead 12 volt battery in just weeks. You have to be more proactive than that.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

dudleypippin
Posts: 3
Joined: Mon Feb 13, 2017 6:11 am
Delivery Date: 13 Feb 2017
Leaf Number: 409255

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Fri Dec 08, 2017 2:54 pm

LeftieBiker wrote:"Jump start the vehicle when needed" is terrible advice. It's a recipe for a truly dead 12 volt battery in just weeks. You have to be more proactive than that.


Yep, I've been tending my battery every other night. It's the only thing that saves me from having to jumpstart once a week. :-/

cmgolden
Posts: 2
Joined: Thu Dec 07, 2017 10:39 am
Delivery Date: 15 Dec 2013

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon Dec 11, 2017 2:49 pm

lorenfb wrote:
cwerdna wrote:
cmgolden wrote:I have a 2013 LEAF with the 3G TCU upgrade and am also experiencing the frequent 12V battery drain.
Has anyone heard of a successful resolution? E.g. replacing the TCU again and lucking onto a 3G unit that works? Or Nissan resolving the issue in some fashion (short of just disabling the 3G/TCU)? Does anyone have a 2013 with a 3G TCU that doesn't cause this 12V issue?

No. But, you could pull the fuse when the TCU seems to get stuck and stops communicating. That might help prevent the drain


Or just stop using the TCU functions! I don't use it except for updating charging locations and NEVER have had any battery problems or a need to pull a fuse.

Of course, I was hoping for a solution other than "just disabling the 3G/TCU." By analogy, if the using the heater caused the drive motor to stop, driving only during the summer (or wearing really warm clothes) is not the workaround I'd hope for from Nissan.

lorenfb
Posts: 1407
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Mon Dec 11, 2017 3:04 pm

cmgolden wrote:
lorenfb wrote:
cwerdna wrote:No. But, you could pull the fuse when the TCU seems to get stuck and stops communicating. That might help prevent the drain


Or just stop using the TCU functions! I don't use it except for updating charging locations and NEVER have had any battery problems or a need to pull a fuse.

Of course, I was hoping for a solution other than "just disabling the 3G/TCU." By analogy, if the using the heater caused the drive motor to stop, driving only during the summer (or wearing really warm clothes) is not the workaround I'd hope for from Nissan.


As noted before, it's most likely a design problem only corrected by replacement TCU.

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