500e died

Toku10 · Sep 19, 2024

My 500e stopped working unexpectedly this morning, and I noticed that the ABS, RBS, and ESC warning lights turned on at the same time. Could a faulty 12V battery be the cause? I'd like to get your opinion before taking it to the dealer.

False_Dragon · Oct 3, 2024

It sounds like there's a bug in the startup routine that's causing all sorts of problems. The humidity sensor seems particularly unreliable, which is frustrating because it can lead to unnecessary AC use. If the sensor test takes too long, it can interfere with other sensors, like the wheel speed sensors, and cause the car to malfunction. It's a real pain, and I hope they can fix it soon.

gotti42 · Oct 4, 2024

False_Dragon said:
It sounds like there's a bug in the startup routine that's causing all sorts of problems. The humidity sensor seems particularly unreliable, which is frustrating because it can lead to unnecessary AC use. If the sensor test takes too long, it can interfere with other sensors, like the wheel speed sensors, and cause the car to malfunction. It's a real pain, and I hope they can fix it soon.

Agreed. There are times when simply disconnecting the humidity sensor does the trick.

f.r.a.n.k. · Oct 4, 2024

Toku10 said:
My 500e stopped working unexpectedly this morning, and I noticed that the ABS, RBS, and ESC warning lights turned on at the same time. Could a faulty 12V battery be the cause? I'd like to get your opinion before taking it to the dealer.

For me, yup, a wonky 12V battery can definitely kick those warning lights into gear, messing with your ride's electronic systems. It’s a smart move to check the battery first, could save you a trip to the dealer and some serious cash!

GhostPenguin · Oct 7, 2024

So a couple of weeks back, my car threw up some warning lights too! Turns out it was the speed sensor. It’s been hanging out at the Fiat dealer, and they’re leaning toward saying I need a new one. I should hear back by the end of the week. Here’s hoping it’s just this and doesn’t break the bank! Fingers crossed!

chancepeacock · Feb 8, 2025

It's definitely possible a faulty 12V battery could be the problem for your 500e suddenly stopping and those warning lights coming on. A weak or dying 12V battery can cause all sorts of weird electrical issues in modern cars even if it seems like it has enough juice to power some things. Since the ABS, RBS, and ESC systems are all related to braking and stability control, a voltage drop or a sudden power loss could easily trigger those warnings. Before you go to the dealer, get the 12V battery tested properly tested at an auto parts store.