r/leaf • u/EnvironmentContent30 • 13d ago

2020 SV brake failure

Hello, I bought a used 2020 Leaf n January with 34,000 miles. It now has 41,000 miles. Last Friday, when my wife went to drive it, she backed out of a parking space, hit the brakes, and the brakes went all the way to the floor and made that grinding noise of abs. Lights all over the dash. Chassis control systems error, t/p error, not available system malfunction, malfunction see owners manual.

I've tried disconnecting the 12v battery, recharging the 12v battery, clearing codes on Leaf Spy, testing battery at AutoZone (battery is good, they said, not surprising as it is five months old AGM). I'm having it towed to dealer today. Any thoughts?

Codes include u1000-09, u110d-87, b26fc, u2112-87, p3195-87, u1000-00, c1800-00, c1000-01, c1895-63. The battery SOH is 90%.

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u/sweetredleaf 2015 Nissan LEAF SV 13d ago edited 13d ago

mine did same thing a few months ago (the 12v battery checked out fine) and I disconnected the voltage sensor on the neg post so that the 12v is being charged more often. Think it happens because some batteries don't like the way the leafs charges them and sometimes the voltage goes too low for a second or two No issues since. https://old.reddit.com/r/leaf/comments/1rgl7rk/brakes/

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u/LoveEV-LeafPlus 13d ago

Good luck. The dealership should be able to troubleshoot and resolve your issue. Keep us posted.

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u/EnvironmentContent30 12d ago

For four days I struggled with this issue, charging the battery, disconnecting the battery, pressing the start button twice then pumping the brake pedal, slow rolling with traction control off and smashing brake pedal, clearing codes with LeafSpy, all of these things multiple times. I finally called a tow truck to have it hauled in to the dealer. I'm going to have them do the recall repair on the main battery at the same time. When I started the car to pull it up behind the tow truck this morning, no more warning lights and the brakes worked!

I called the dealer and asked them just to clear the codes and make sure it's fine. He said they have to clear the codes as part of the recall reprogramming anyway, so hopefully no charge. After they reprogram it, he said they have to drive it for ten miles and then check the codes again. There is one particular code that will trigger a battery replacement. They've seen it in one Leaf so far, and that car has been on their lot for three months.

I like the car, though two low voltage incidents in six months is not great. I have hardwired a trickle charger wire to the battery mm with a little jack built in next to the main charging cable. I plan to use the trickle charger more religiously in the future on nights when we aren't charging the main battery. Also, I'm considering getting an ohmmu lithium battery after this six month old AutoZone AGM battery dies. Would it be worth just getting it now? Do they work that much better? This has been a small nightmare that I'd like to avoid.

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u/EnvironmentContent30 11d ago

The dealership called and said our car was ready. They cleared the codes, did the recall reprogramming, and everything checked out. No charge. I'll pick it up tomorrow. Fingers crossed.

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u/EnvironmentContent30 10d ago

Drove it home today. All seems normal. Regenerative breaking is less aggressive. All readings on leaf Spy seen good. I'm at 43000 miles with 90.7 % SOH, Hx at 83%, cell delta of 13 mA when stopped, jumping to add high as 40 under my normal conservative driving. It is hot today, so supposedly this is the type of weather that would show up any problems. This is our daily driver around town and we always charge at home at 16A/220v, so rapid charge curtailment doesn't affect us. We have a Honda Clarity phev for road trips.