Per the Repair Manual/Owner Manual: Battery State of Charge (SOC) less then 68% will prevent the ISG from engaging. Of course, there are may other conditions which must be met. If you mostly drive short distances, it is likely the battery is not getting fully charged. Many newer vehicles do not "constantly" charge the battery like older vehicles - instead they charge only as necessary to keep the vehicle operational (and startable) as this can help gas mileage (not constantly charging sheds some load on the engine and can save a bit of gas). I suspect Hyundai probably utilizes the "load shedding" as most on the forum never see a full state of charge on their battery. My guess is that a new battery would probably improve the battery SOC and allow ISG to engage more often.Hi everyone. I am new to this form and found it as I was trying to troubleshoot my system.
I noticed that my ISG doesn’t come on anymore unless I charge my battery over night, then it works for a few days and stops again.
I had my battery tested twice now, once at the dealer and it registered 73% SOC and had it done weeks later at autozone and it registered 76% SOC. Is that normal ?
if that battery hovers at that range all the time, then the ISG will rarely come on.
Dealer doesn’t really want to replace the battery because it’s “technically” testing GOOD.
Personally, I'd be happy if ISG never engaged on mine (I've permanently defaulted mine to OFF) but I understand those who do like the feature. I suspect it will be a challenge to get the dealer to replace the battery. So, a couple of options are: 1. replace the battery at your cost (probably $150ish). You could get a battery (make sure it is an AGM battery) from many places that will be much cheaper than the dealer, 2. make a deal with the dealer, replace the battery and if it solves it, the dealer pays for the battery, if not, you pay the dealer for the battery, 3. put a battery tender on it once a week or every night, 4. Live with it the way it is. I'm sure there are many other options too. Based on what you describe, I would guess you usually drive short distances and the battery is probably marginal (even though it tests OK). Anyway, those are my thoughts..... Let us know what you decide to do and how it turns out.