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12 volt replacement update. Dealership put in a new 12 volt finally on second visit. Found multiple codes had indeed been set: C1109, C118c, P0A8D, P3178, P0A8F, and C1A90--all described as low 12v. Also "Failed battery code: Bat TD4 LTH EWO 73J." Also, Tested 12v battery with GR8 testing...

Thank you folks for helpful details on how the 12 volt is integrated into the Leaf's operation. I'm glad this forum is here. Otherwise owners who are interested in how their cars work wouldn't have much recourse. I will indeed climb the ladder with this local dealership if they don't put a new...

Finally got through to a person on the phone. They hadn't returned my call at Nissan Marin--now under new ownership. Took the new Leaf in today now 2nd time same problem (370 miles)--low 12 volt battery voltage. Service advisor told me the 12 volt is only necessary for turning on the Li-ion...

Thanks Tim. I agree. I think I'll call the dealer and see if they can get me a battery now rather than later. I have another car, but basically foolish to try to go somewhere with the bad 12 volt. Car ran fine yesterday, but this is something the dealerships should be very alert on--and respond.

Interesting discussion. Waiting for 2nd appointment with Nissan Marin this Friday. I tried to quick charge the 12 volt with a noco lithium booster--to no avail. Put a smart charger on the 12 volt lead/acid for 2 hours and the voltage never rose to 12 volts even though my Fluke meter said the...

Thanks, Queen Bee, for your reply. Will post more after I revisit dealer. This Leaf only has about 365 miles so the 12 volt lead acid battery is "new." A little disappointed dealer didn't really respond to my observations about runaway and low voltage on the 12 volt. I had my foot hard on the...

Have recently bought (10/4/15) a "2015" Leaf that actually was built in August 2014. Have been reading posts to this forum regarding 12 volt lead acid battery issues. Recently took Leaf into dealer for software upgrade for brakes. Have had the car try to run away in forward and reverse. Has...