Thekuai
Posts: 40
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Brake failure

Mon Nov 11, 2019 3:27 pm

Brakes broke?

I Go to start the car, and this happens.
Any ideas?

12v reading 12.7 volts on accessory mode

I have an OBD2 dongle for leafspy plugged in and a fleet karma device plugged in to obd port all the time.

Image

[youtube]https://youtu.be/Ts2fUm8Eme0[/youtube]
Last edited by Thekuai on Thu Nov 14, 2019 9:15 am, edited 1 time in total.

LeftieBiker
Moderator
Posts: 13452
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Brake failure

Mon Nov 11, 2019 3:32 pm

Try the 12 volt battery voltage with the car off completely for at least 15 minutes.

That Photobucket link started a cascade of popup "traps" in which the only way to escape what appeared to be a scam site was to close my browser.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Thekuai
Posts: 40
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brake failure

Mon Nov 11, 2019 8:52 pm

I use a battery tender every time I charge my car. I had just disconnected it before turning on the car in the video from charging overnight

LeftieBiker
Moderator
Posts: 13452
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Brake failure

Mon Nov 11, 2019 9:01 pm

Is the 12 volt battery original? If it isn't really old, then I have no immediate answer for you. Folks...?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Lothsahn
Posts: 533
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: Brake failure

Mon Nov 11, 2019 9:12 pm

Best thoughts:
1) Nissan personally has a bulletin out to not leave devices plugged into the OBDII port for long periods of time "as they cause issues with brakes and other systems”. https://flipthefleet.org/2019/nissan-ad ... 2-devices/
2) Reset the car by removing the Negative terminal from the battery for 15 minutes. Then re-attach it.
3) Clear any and all codes with LeafSpy Pro

I personally leave a https://bafxpro.com/products/obdreader plugged in at all times. However, I modified mine to be powered off accessory power, so it doesn't appear plugged in for a long time--it's only on when the car is on.

If the issue persists after a power cycle, you probably have a failure in the car somewhere.

The only commonality of all of those errors is the "Comm error". This means that your devices are having trouble communicating on the CAN bus. Either some device has gone bad and is putting interference on the bus, or you possibly have a shorted, disconnected, or chewed wire somewhere.

Did you mess with the TCU lately, or have any TCU work done? The TCU is reporting disconnect from the rest of the car. I know when I unplugged one of the connectors on my TCU, I got a similar slew of errors.
Last edited by Lothsahn on Thu Nov 14, 2019 4:30 pm, edited 1 time in total.
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

Thekuai
Posts: 40
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brake failure

Mon Nov 11, 2019 10:09 pm

Lothsahn wrote:
Mon Nov 11, 2019 9:12 pm
Best thoughts:
1) Nissan personally has a bulletin out to not leave devices plugged into the OBDII port for long periods of time "as they cause issues with brakes and other systems”. https://flipthefleet.org/2019/nissan-ad ... 2-devices/
2) Reset the car by removing the Positive terminal from the battery for 15 minutes. Then re-attach it.
3) Clear any and all codes with LeafSpy Pro

I personally leave a https://bafxpro.com/products/obdreader plugged in at all times. However, I modified mine to be powered off accessory power, so it doesn't appear plugged in for a long time--it's only on when the car is on.

If the issue persists after a power cycle, you probably have a failure in the car somewhere.

The only commonality of all of those errors is the "Comm error". This means that your devices are having trouble communicating on the CAN bus. Either some device has gone bad and is putting interference on the bus, or you possibly have a shorted, disconnected, or chewed wire somewhere.

Did you mess with the TCU lately, or have any TCU work done? The TCU is reporting disconnect from the rest of the car. I know when I unplugged one of the connectors on my TCU, I got a similar slew of errors.
I'm leaning towards 1) i just read that article. I have a fleet carma and a bluetooth obd2 for leafspy which are connected 24/7 with an obd2 y splitter cable. That probably doubles my odds of failure.

I tried disconnecting 12v and clearing to no avail.

I pulled the radio fuse previously because my nissan connect app wasn't turning on the climate control so maybe that's why?

Lothsahn
Posts: 533
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: Brake failure

Mon Nov 11, 2019 10:45 pm

Thekuai wrote:
Mon Nov 11, 2019 10:09 pm
Lothsahn wrote:
Mon Nov 11, 2019 9:12 pm
Best thoughts:
1) Nissan personally has a bulletin out to not leave devices plugged into the OBDII port for long periods of time "as they cause issues with brakes and other systems”. https://flipthefleet.org/2019/nissan-ad ... 2-devices/
2) Reset the car by removing the Positive terminal from the battery for 15 minutes. Then re-attach it.
3) Clear any and all codes with LeafSpy Pro

I personally leave a https://bafxpro.com/products/obdreader plugged in at all times. However, I modified mine to be powered off accessory power, so it doesn't appear plugged in for a long time--it's only on when the car is on.

If the issue persists after a power cycle, you probably have a failure in the car somewhere.

The only commonality of all of those errors is the "Comm error". This means that your devices are having trouble communicating on the CAN bus. Either some device has gone bad and is putting interference on the bus, or you possibly have a shorted, disconnected, or chewed wire somewhere.

Did you mess with the TCU lately, or have any TCU work done? The TCU is reporting disconnect from the rest of the car. I know when I unplugged one of the connectors on my TCU, I got a similar slew of errors.
I'm leaning towards 1) i just read that article. I have a fleet carma and a bluetooth obd2 for leafspy which are connected 24/7 with an obd2 y splitter cable. That probably doubles my odds of failure.

I tried disconnecting 12v and clearing to no avail.

I pulled the radio fuse previously because my nissan connect app wasn't turning on the climate control so maybe that's why?
If you've already disconnected 12v and cleared and it didn't work, it's probably not your FC or splitter. That said, try plugging JUST the BT ODB2 for Leafspy into the car--no FC box and no splitter cable. See if you can clear that way after disconnecting 12V.

You did disconnect the 12V for 15 minutes, right? Not just a quick unplug, replug job? It does take a few minutes to discharge the capacitors.

If you had this start after you pulled a fuse, I'd try re-inserting the fuse. If you've already done that, go check the fuse and make sure it's not blown. I do know for a fact that the TCU has 3 cables - Power, CAN, and antenna. If you pull power, the TCU won't work, there's a single code, but the car is otherwise fine. If you pull antenna, it throws a different code, but the car is fine. If you pull the CAN connector, you get a ton of CAN bus comm errors.

You might also consider pulling the TCU fuse and leaving it out. If the TCU is messing with the bus, pulling the fuse for it might restore everything. Worth trying... if it does resolve it, you at least know what's causing the problem.

At this point, if you've double checked everything you can do, the only last remaining thing would be to buy a different ODBII connector (I recommend BAFX) and try clearing with that. That's a longshot, but *maybe* your ODBII device is actually causing the problem. I doubt it.

Most likely, your car will need repairs. If the dealer gives you some outrageous number and you're mechanically inclined, grab the service manual and start digging. But this particular project sounds... not fun. :(

Really dumb question--you haven't been in the dash disconnecting or reconnecting any cables, have you? If so, double check all the connections are snug.

If you need my help with suggestions on the service manual, let me know, but I don't know much more than you at this point. This is a failure I haven't seen before.

Sorry for the bad news.
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

Thekuai
Posts: 40
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brake failure

Tue Nov 12, 2019 4:45 am

Lothsahn wrote:
Mon Nov 11, 2019 10:45 pm
Thekuai wrote:
Mon Nov 11, 2019 10:09 pm
Lothsahn wrote:
Mon Nov 11, 2019 9:12 pm
Best thoughts:
1) Nissan personally has a bulletin out to not leave devices plugged into the OBDII port for long periods of time "as they cause issues with brakes and other systems”. https://flipthefleet.org/2019/nissan-ad ... 2-devices/
2) Reset the car by removing the Positive terminal from the battery for 15 minutes. Then re-attach it.
3) Clear any and all codes with LeafSpy Pro

I personally leave a https://bafxpro.com/products/obdreader plugged in at all times. However, I modified mine to be powered off accessory power, so it doesn't appear plugged in for a long time--it's only on when the car is on.

If the issue persists after a power cycle, you probably have a failure in the car somewhere.

The only commonality of all of those errors is the "Comm error". This means that your devices are having trouble communicating on the CAN bus. Either some device has gone bad and is putting interference on the bus, or you possibly have a shorted, disconnected, or chewed wire somewhere.

Did you mess with the TCU lately, or have any TCU work done? The TCU is reporting disconnect from the rest of the car. I know when I unplugged one of the connectors on my TCU, I got a similar slew of errors.
I'm leaning towards 1) i just read that article. I have a fleet carma and a bluetooth obd2 for leafspy which are connected 24/7 with an obd2 y splitter cable. That probably doubles my odds of failure.

I tried disconnecting 12v and clearing to no avail.

I pulled the radio fuse previously because my nissan connect app wasn't turning on the climate control so maybe that's why?
If you've already disconnected 12v and cleared and it didn't work, it's probably not your FC or splitter. That said, try plugging JUST the BT ODB2 for Leafspy into the car--no FC box and no splitter cable. See if you can clear that way after disconnecting 12V.

I tried just plugging in the BT OBD, no splitter. Everytime I clear a DTC, it comes back when leafspy automatically reads the DTCs after clearing.

You did disconnect the 12V for 15 minutes, right? Not just a quick unplug, replug job? It does take a few minutes to discharge the capacitors.

yes I made sure to wait at least 15 minutes after disconnecting the 12v

If you had this start after you pulled a fuse, I'd try re-inserting the fuse. If you've already done that, go check the fuse and make sure it's not blown. I do know for a fact that the TCU has 3 cables - Power, CAN, and antenna. If you pull power, the TCU won't work, there's a single code, but the car is otherwise fine. If you pull antenna, it throws a different code, but the car is fine. If you pull the CAN connector, you get a ton of CAN bus comm errors.

I pulled the red 10a radio fuse under the hood about 2 weeks prior to this so I don't think that is it. That's the only fuse I pulled.

You might also consider pulling the TCU fuse and leaving it out. If the TCU is messing with the bus, pulling the fuse for it might restore everything. Worth trying... if it does resolve it, you at least know what's causing the problem.

after I cleared the TCU code, it never came back

At this point, if you've double checked everything you can do, the only last remaining thing would be to buy a different ODBII connector (I recommend BAFX) and try clearing with that. That's a longshot, but *maybe* your ODBII device is actually causing the problem. I doubt it.

Most likely, your car will need repairs. If the dealer gives you some outrageous number and you're mechanically inclined, grab the service manual and start digging. But this particular project sounds... not fun. :(

I bought the certified certified preowned 1 year ago and it came with a 2 year warranty

Really dumb question--you haven't been in the dash disconnecting or reconnecting any cables, have you? If so, double check all the connections are snug.

not a dumb question, but no I have not messed with the dash or any cables. In fact the night before I drove 30 miles no problem. Charged it overnight without touching anything else and woke up to this problem about 9 hours after charging completed. I had the battery tender connected up until this point as well.

If you need my help with suggestions on the service manual, let me know, but I don't know much more than you at this point. This is a failure I haven't seen before.
thanks, you are the only one helping really this far, I'm going to the Nissan dealer today. Wish me luck!
Sorry for the bad news.

Lothsahn
Posts: 533
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: Brake failure

Tue Nov 12, 2019 7:37 am

Thekuai wrote:
Tue Nov 12, 2019 4:45 am
I bought the certified certified preowned 1 year ago and it came with a 2 year warranty
Glad to hear it. I realize the other questions were long-shots, but I had to ask. Let us know what the root cause is--it helps us help others!
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

Thekuai
Posts: 40
Joined: Fri Oct 12, 2018 6:11 pm
Delivery Date: 13 Nov 2018

Re: Brake failure

Wed Nov 13, 2019 1:45 pm

Update:

Local Nissan dealer wants $4600 to replace the brake control unit and abs unit. It is NOT covered under warranty. The warranty I have is a limited certified preowned warranty. The car is a 2015 with 25,000 miles. I called 1877nogasev and they are getting the info from this dealer and will get back to me on monday the latest.

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