[Wondering01]

Been frustrated with my 2019 Santa Fe, it’s Start/Stop feature stops working because its battery falls below the 70% charge range it requires. Something is not allowing the battery to charge from what appears to be a operable alternator. I’ve bought one of those voltage meters that plug into the lighter and it reads 14.1v when it runs down the road so I think the alternator is working but somehow not getting full charge to battery, or there is a sneaky voltage draw when it sits in the driveway. I have taken it to the dealership many times and they say they can’t find anything, I think they’re doing alot of head scratching on this. Any help is appreciated.
Tom

 

[Western_Rider's_Dad]

Been frustrated with my 2019 Santa Fe, it’s Start/Stop feature stops working because its battery falls below the 70% charge range it requires. Something is not allowing the battery to charge from what appears to be a operable alternator. I’ve bought one of those voltage meters that plug into the lighter and it reads 14.1v when it runs down the road so I think the alternator is working but somehow not getting full charge to battery, or there is a sneaky voltage draw when it sits in the driveway. I have taken it to the dealership many times and they say they can’t find anything, I think they’re doing alot of head scratching on this. Any help is appreciated.
Tom

You may want to review this thread. Our '22 SF Hybrid doesn't use the same ISG implementation as the non-hybrid models, so can't offer any direct feedback.

(1) TDS from Hyundai on ISG Stop/Start System | Hyundai Forums (hyundai-forums.com)

 

[Wondering01]

Thanks for info. Read thru it and it seems the conclusion for most was to shut the system off. We’ve replaced the OEM battery with a new one and it apparently got drawn down, so there must be something still drawing power when its parked or the charging systems not getting charge enough to the battery? Either way I don’t understand the dealer or manufacturer not figuring out this issue. Something doesn’t get this resolved on this soon I’ll never buy a Hyundai again!

 

[ELP_JC]

ISG is mostly a gimmick to get EPA discounts folks, so don't understand the outrage about it. It's only depleting the battery when working, plus excess wear and tear on starter, engine, etc. And when it restarts right away, like with a very short stop, or because A/C is on, it's actually wasting more fuel. Just drive in a fuel efficient matter, and it'd result in much better fuel savings than using that crap of a system IMO. But to each his own.

 

[wbw]

I turn mine off after starting the car.

 

[breakers28]

There are several threads on this topic. If you typically make short drives, it will draw the battery down. Starting a vehicle is a major draw on a battery. If there is not enough drive time to sufficiently charge the battery it will soon be drawn down with multiple restarts from the stop and go (ISG) feature. I’m sure the ISG works for a while when you put in a new battery then it stops working again. In addition the battery state of charge (SOC) must be above 68%. However the vehicle will try to charge the battery to about 80% SOC then slow charge after that. This leaves a small usable window of SOC. Like it or not, a battery maintainer (such as a Battery Tender or NOCO) will top off the battery and ISG will work a bit longer. Some don’t want to have to hook up a battery charger all the time but it will help the ISG to work. There are a few ways to disable the ISG if you search. Personally I’m not a fan of the ISG but for those who like it and make short drives, a battery maintainer is probably one of your best options