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I just picked up a low mile 2016 Z06 2LZ M7 of my dreams and it was displaying this Low battery message. I was thinking, oh no, an alternator now? Battery? So I checked the corvette forum and saw many threads. People had changed batteries and alternators and still had the message. Then someone said check the little black wire. Well that was my problem. As soon as I opened the battery compartment I saw the broken wire (see pic). Lucked out and had a spare ring fitting and crimped it on. Bolted it back on and took it for a rip. Message is gone. Sweet. Here's the funny thing. I got all the service records for this because the 1 owner bought it new and did all his service at the dealer I bought it from (traded it in on a new C8 vert). I looked at the records and saw the owner reported the Low voltage message to the service writer (September 2025). But it didn't show any corrective action. So they didn't even [know how to] fix it. I'm assuming he put a new battery in it because it's a die hard Gold but that's not in the service records. Starts really healthy. So anyway this forum rocks. I saved a lot of time and money today.
YEP, the "Little Black Wire"! That's why I would never take my car to the dealer. I replaced my battery, it isn't rocket science. You can see the little black wire connected to the negative cable as soon as you remove the cover.
I was pretty happy to see that message gone. This sat at the dealer for a couple weeks after trade-in. It went through their internal used car inspection process. While I'm happy they did an oil change, they completely failed at addressing this. I'm thinking whoever did the last battery swap broke it. Maybe the owner did it himself or he let Batteries plus do it.
I'm guessing they're lazy, instead of unbolting the grnd cable from the clamp, along with the little black wire, the tech just unbolts the clamp from the battery post and pushes everything out of the way because of the lack of space, often damaging the little wire. Just my opinion.
[QUOTE=Tinkertech;1609611651]GM should have lengthened the black wire a couple inches to avoid this common problem.
But at $0.001 / inch, GM could have gone broke
Low battery warning message
