AucturitasJones
Well-Known Member
Hi. My Jeep is in the shop because this has happened a couple times and then it "stuck" on as an issue yesterday. I checked the battery which was stuck at 12.5 vdc instead of 13.7 vdc. When I checked the ESS messages (#6 screen in the garage cluster) it said battery protection mode. I hit the UConnect assist button on the mirror and the rep thought it could be the auxiliary battery. There are two batteries because it the ESS. If the extra battery overheats or goes bad it can cause the ESS to give an error. I dropped her off this morning at the dealer to get looked at.Biscuit: you're rude and you misread. I didn't ask why, at my, say, first traffic light 30 seconds from my home the ESS didn't engage. I'm well aware of many of the factors that would have the ESS not kick in, from engine temperature, to battery voltage, to operational of the air conditioning on high, etc. In fact I discuss this in my post immediately above and explain the problem in my first post adequately enough for others to understand. This is the OPPOSITE of a broken ESS I describe. It's a vey much working ESS that's detected conditions not suited to its engaging at a vehicle stop.
Maybe I didn't make myself clear. Another poster had your suggestion but he didn't put the stupidity on me.
I'm asking why the vehicle turned the ESS error light on, on the dashboard, 5 seconds after turning over the rig.
There is a difference between a working ESS system, that doesn't engage because, say, the engine is cold, and which doesn't display an ESS failure light on the dash because the ESS IS working--in fact it's working enough to know it shouldn't engage yet--and a broken ESS system that displays a diagnostic on the dash.
The problem ended up going away. Maybe it was low ESS battery voltage that charged with enough road mileage. The rig's diagnostic screens showed 14.4V, but that could have been on the main battery only. I don't know which voltage(s) are shown on the dash.
I'm guessing you are still under warranty, so take her in and get it fixed before she strands you on the side of the road. Good luck!
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