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Start Stop Message: Stop/Start Not Ready Battery Charging
Wolf Island Diver
Well-Known Member
I started getting this message about 3 months into owning my Jeep in 21’. On longer trips ESS would still work after a while. I personally had no issue with ESS doing it’s thing other than the tendency to activate whenever I pulled into my driveway. This was particularly annoying when it wouldn’t work at all during the preceding drive. Beyond the system being dumb about when it works, I think their implementation is less annoying than other makes. I noticed that the availability of ESS decreased fairly linearly from April 21 to this spring when it was basically never available.
When I started getting the “Aux Switches Temporarily Unavailable” message earlier this year my starting battery was dead within a week. Both batteries tested bad. They warrantied both. For about a month after ESS worked flawlessly and was available all the time. No error messages. Within a month I was back to have the ESS unavailable message again on short drives. There are multiple failure modes for either battery but in any parallel or series battery bank even if there’s a state-based disconnect, a bad cell in one battery can lead to an eventual failure of the other batteries. Note that two batteries connected via DC-to-DC charger isn’t a battery bank. The Aux and Starting batteries are connected in parallel.
My dealership’s (Jeep only dealership) service director told me ESS, Aux and starting battery failures are the number 1 warranty issue they deal with. They recommend I disable ESS and disconnect/remove the Aux battery. They don’t care if I use a Tazer to do so. I’m not sure I’d go that far for an exclusively street driven truck. When my battery failed, the CAN bus system went nuts. The truck shredded my wiper blades. The lights went crazy and I could no longer lock or unlock the truck. It failed to an unlocked state. I had to disconnect my battery to get the wipers and lights to stop but there wasn’t enough juice for the fob to work, interior light to work, transmission selection to work or to start. It left my truck stranded in a really bad place on the side of my house and the tow truck driver and I had to push it to the tow truck. I’m not willing to have this happen when off road so I got rid of the warranty Aux battery.
One thing to note is that I don’t drive my truck everyday. This is going to exacerbate any of these battery issues, so consider getting a tender if you don’t commute with your truck and decide to keep the Aux.
When I started getting the “Aux Switches Temporarily Unavailable” message earlier this year my starting battery was dead within a week. Both batteries tested bad. They warrantied both. For about a month after ESS worked flawlessly and was available all the time. No error messages. Within a month I was back to have the ESS unavailable message again on short drives. There are multiple failure modes for either battery but in any parallel or series battery bank even if there’s a state-based disconnect, a bad cell in one battery can lead to an eventual failure of the other batteries. Note that two batteries connected via DC-to-DC charger isn’t a battery bank. The Aux and Starting batteries are connected in parallel.
My dealership’s (Jeep only dealership) service director told me ESS, Aux and starting battery failures are the number 1 warranty issue they deal with. They recommend I disable ESS and disconnect/remove the Aux battery. They don’t care if I use a Tazer to do so. I’m not sure I’d go that far for an exclusively street driven truck. When my battery failed, the CAN bus system went nuts. The truck shredded my wiper blades. The lights went crazy and I could no longer lock or unlock the truck. It failed to an unlocked state. I had to disconnect my battery to get the wipers and lights to stop but there wasn’t enough juice for the fob to work, interior light to work, transmission selection to work or to start. It left my truck stranded in a really bad place on the side of my house and the tow truck driver and I had to push it to the tow truck. I’m not willing to have this happen when off road so I got rid of the warranty Aux battery.
One thing to note is that I don’t drive my truck everyday. This is going to exacerbate any of these battery issues, so consider getting a tender if you don’t commute with your truck and decide to keep the Aux.
Charly_Mojave
Member
Hi Guys I got my Mojave 2023 and I got the same issues related to the batteries, the dealer already changed both batteries the auxiliary first and a couple of weeks the main but still the problem remains, anyone for here know what the root cause really is?
Charly_Mojave
Member
Hi Guys I got my Mojave 2023 and I got the same issues related to the batteries, the dealer already changed both batteries the auxiliary first and a couple of weeks the main but still the problem remains, anyone for here know what the root cause really is?Bought a 22 Rubicon a month or so ago from a Ford dealer who took it in on trade for a Bronco Raptor. I keep reading abut people hating the engine cutting off at red lights and using the Tazer or devices to disable or turn off manually.
Mine has never turned off ever. Attached is the message on the screen. I have not done anything to the batteries and wondering if maybe the former owner bypassed the Aux batter? Or maybe there is a tazer module hidden in there and he never told the dealer.
Any ideas what would make this message appear? Everything functions normally and no error codes.
OP
OP
PDACPA
Well-Known Member
- Thread starter
- #20
Mine ending up being the battery. Do you think yours has a Tazer installed? Look under the driver dash. I put one in mine after I had the issue so I could update my tire sizes (and permanently turn off the start stop as I have a diesel and do not want the engine starting and stopping).
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