It happens to my wife once but I didn't believe her last month. I've ask her what happen and describe in sequences. She told me had her foot on brake, press start then put it in Reverse while the foot still on the brake from the beginning. Once in Reverse she looks back and saw people coming so she kept her foot on the brake. All of sudden the brake just felt soft and sink to the floor and car roll. She panic and lift her foot half way off the brake and press again it still roll; while the parents walking in back screaming. My wife pulls the electronic brake it didn’t work. Finally she lifts her foot of the brake completely. Somehow the software figures out the reference point and she hit the brake and it stop. The parent came screaming at her trying killing her kid. After that experience she didn’t borrow my car anymore. So I just brush it off but pay attention to my Leaf thinking she must have done something wrong. Last night first time experience her same symptom. I had my foot on the brake press Start Button then put the car in Reverse and the car roll while my foot is still on the brake. The brake just sinks straight to the floor. I quickly lift my foot completely off the brake and slam on it and it stop. I fear one day someone going kill somebody while the car in Reverse driving a Leaf. I fear during the start the brake lost it reference and software doesn’t know where the reference point begin.
Other Problem!
-Car park on uneven pavement car brake lock! Therefore when you press brake your car can’t start. It can’t register my foot on the brake. (Solution I observe pulls my emergency parking brake on; wait then foot brake release. Turn off the screen now press your foot brake and feel it depress car register your foot on brake then it let you start. Nissan need fix software if roll and lock on an uneven pavement. Lock the brake fine but activate the parking brake then release the foot brake that lock. User now press brake again then start..problem fix! If Nissan not paying to this issue not many Leaf owners will pull their parking brake therefore the system kept saying press brake to start. The only way to release this brake pedal lock you have to activate the parking brake manually. Nissan software should do this automatic!
Otherwise this car is awesome! I’m not sure how long they are keeping my car but once I get it back I will do my best to update everyone in the forum. I just feel my duties to report for safety of Leaf owner to get this fix and enjoyable for future Leaf buyer!
12/01/2012
Ok got the call today to pick up my car tomorrow. Their explanation was I got all these faulty errors was due to a 12V battery. They have all my error codes download and conclude the 12V cause the can bus to go hay wire. They replaced the 12V battery and drain my main battery and recharge. They said everything is working fine. I’ve ask them over the phone was there any cause from the mechanical brake. Their respond was 12V cause faulty error and no mechanical brake issue.
Also the 12V will solve the start issue on the uneven pavement. Guys don’t worry once I get my car back I know where to park to see if this problem is resolve.
For the record before I brought my car in for service. I did check the 12V battery every time I had issues in past. I measure with my voltmeter reading 10.7V to 11.2V.
Anyway I will continue to monitor my issues and update in 3 months. If I see no more issues; I can conclude the 12V battery replacement fix all my issues. I will also ask if they updated the software or kept the current version.
Again Thanks to all that supported my issues and wanting Nissan to improve for future generation to enjoy the Leaf and safety come first!
12/02/2012
Pick up the car this morning. Once started the Leaf mileage reading show 105 miles on display. I’ve notice the brake felt different in a way that it felt stronger not relax feel as before. I drove the car home and measure the voltage and new battery reading 12.31 volts. Anyway I will do more testing on uneven pavement testing in next few days. Hope all my problem is resolve due to low 12V battery. If this is case we should all measure our 12V battery often….wow! Now I’m wondering what happen in real situation when the car let you start up and while driving the 12Volts battery is lost…does this mean you lost power to certain controls? I just hope we don’t lost power to our emergency brake…
"Report came back found multiple codes 62 total. The mechanic in charge called the Nissan Tech Line and had them review all but found all up to date. Tech Line confirms that 12V battery went low; recommendations from tech line replace new 12V battery (NB51R). Test drove and check for codes again. All to be ok".
12/03/2012
ok measure with another voltmeter at work. The new reading is 12.47volts. This battery is brand new; replacement just 2 days ago.
Also had a chance to park at 3 different locations on uneven pavement. I couldn't repeat the brake lock symptom anymore.
So I'm going to conclude all my problems that I have listed is due to the 12Volts battery running low in range of 10.7 to 11.3 volts. I hope in near future someone post issues relating to car error. Ask them check the 12volts battery.
Also I agree with one of the post that Nissan should send an email or letter or warning that our 12volts is below the requirement level. I though Nissan download our car information when we hit agreement for information download or I'm mistaking that information download each time we start the car is tracking milage?
Anyway if Nissan can manage to measure the 12volts an display "Warning 12 volts battery replacement or check". It can save lots of headache for future Nissan Leaf owner!
==============>
After thinking with all the pain I had to put up with in past few months. I realize get rid of the tree display and offer me a display to monitor the 12 Volts battery level!!!!!!!!!
We all agree the 12volts battery is the main component in the EV car( I consider the 12volts is a Heart like human body; Heart stop brain won't function anyway)! If 12volts low or dead many of the operation will be non functional! Can someone let Nissan know give us a 12volts display scale! Otherwise future Leaf owner got go buy a voltmeter. When Nissan can display it on the screen.
VIN #000936
Milage:23,700
Other Problem!
-Car park on uneven pavement car brake lock! Therefore when you press brake your car can’t start. It can’t register my foot on the brake. (Solution I observe pulls my emergency parking brake on; wait then foot brake release. Turn off the screen now press your foot brake and feel it depress car register your foot on brake then it let you start. Nissan need fix software if roll and lock on an uneven pavement. Lock the brake fine but activate the parking brake then release the foot brake that lock. User now press brake again then start..problem fix! If Nissan not paying to this issue not many Leaf owners will pull their parking brake therefore the system kept saying press brake to start. The only way to release this brake pedal lock you have to activate the parking brake manually. Nissan software should do this automatic!
Otherwise this car is awesome! I’m not sure how long they are keeping my car but once I get it back I will do my best to update everyone in the forum. I just feel my duties to report for safety of Leaf owner to get this fix and enjoyable for future Leaf buyer!
12/01/2012
Ok got the call today to pick up my car tomorrow. Their explanation was I got all these faulty errors was due to a 12V battery. They have all my error codes download and conclude the 12V cause the can bus to go hay wire. They replaced the 12V battery and drain my main battery and recharge. They said everything is working fine. I’ve ask them over the phone was there any cause from the mechanical brake. Their respond was 12V cause faulty error and no mechanical brake issue.
Also the 12V will solve the start issue on the uneven pavement. Guys don’t worry once I get my car back I know where to park to see if this problem is resolve.
For the record before I brought my car in for service. I did check the 12V battery every time I had issues in past. I measure with my voltmeter reading 10.7V to 11.2V.
Anyway I will continue to monitor my issues and update in 3 months. If I see no more issues; I can conclude the 12V battery replacement fix all my issues. I will also ask if they updated the software or kept the current version.
Again Thanks to all that supported my issues and wanting Nissan to improve for future generation to enjoy the Leaf and safety come first!
12/02/2012
Pick up the car this morning. Once started the Leaf mileage reading show 105 miles on display. I’ve notice the brake felt different in a way that it felt stronger not relax feel as before. I drove the car home and measure the voltage and new battery reading 12.31 volts. Anyway I will do more testing on uneven pavement testing in next few days. Hope all my problem is resolve due to low 12V battery. If this is case we should all measure our 12V battery often….wow! Now I’m wondering what happen in real situation when the car let you start up and while driving the 12Volts battery is lost…does this mean you lost power to certain controls? I just hope we don’t lost power to our emergency brake…
"Report came back found multiple codes 62 total. The mechanic in charge called the Nissan Tech Line and had them review all but found all up to date. Tech Line confirms that 12V battery went low; recommendations from tech line replace new 12V battery (NB51R). Test drove and check for codes again. All to be ok".
12/03/2012
ok measure with another voltmeter at work. The new reading is 12.47volts. This battery is brand new; replacement just 2 days ago.
Also had a chance to park at 3 different locations on uneven pavement. I couldn't repeat the brake lock symptom anymore.
So I'm going to conclude all my problems that I have listed is due to the 12Volts battery running low in range of 10.7 to 11.3 volts. I hope in near future someone post issues relating to car error. Ask them check the 12volts battery.
Also I agree with one of the post that Nissan should send an email or letter or warning that our 12volts is below the requirement level. I though Nissan download our car information when we hit agreement for information download or I'm mistaking that information download each time we start the car is tracking milage?
Anyway if Nissan can manage to measure the 12volts an display "Warning 12 volts battery replacement or check". It can save lots of headache for future Nissan Leaf owner!
==============>
After thinking with all the pain I had to put up with in past few months. I realize get rid of the tree display and offer me a display to monitor the 12 Volts battery level!!!!!!!!!
We all agree the 12volts battery is the main component in the EV car( I consider the 12volts is a Heart like human body; Heart stop brain won't function anyway)! If 12volts low or dead many of the operation will be non functional! Can someone let Nissan know give us a 12volts display scale! Otherwise future Leaf owner got go buy a voltmeter. When Nissan can display it on the screen.
VIN #000936
Milage:23,700