Start stop not working

[Myronlucan]

So I live in Cleveland Oh & I got a 2020 Gladiator Rubicon an I just got it undercoated with fluid film & my start stop does not work now has this happened to anybody else? Should I take it to the dealer?

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[kevman65]

If it's under warranty, yes.

If not, no.

More information will get you better help.

Any dash lights on besides the ESS?

If so list them.

You can test the condition of each battery, @ShadowsPapa will be along to describe that.

You can check the two hood pins, just right of your right hand when you open the hood.
See if there are good connections and make sure there's no corrosion. These have caused the ESS to not work.

 

[93civej1]

mine hardly ever kicks in any more. I dont know it got used to me turning it off so much with the button, or what. No check lights nothing, just hardly ever kicks on even without turning off the button.

 

[whiteglad]

One typical cause is a bad auxiliary battery.

 

[GrubbyBaja]

Is the yellow Stop/Start light illuminated on your dash or is the ASS just not working. Did it work previously and just stopped working after the application of the fluid film? Scroll through the dash menu until you find the Auto-Stop-Start screen. What does it say? Mine tells me if the ASS isn't working due to cabin heating/cooling, engine temperature, "Not Ready", etc. If it says "Not Ready", it's probably due to the battery/s charging. If you are still on the OEM battery/s, those are probably causing your issue as they are not able to hold a full charge. My mom's 2019 JL was showing "Not Ready" for the past 6-8 months and she just got a battery charge error message on her dash last week ... new batteries going in today.

 

[Myronlucan]

The little yellow icon is lit & the start stop message is Stop/Start Unavailable Service Stop/Start System

 

[Mr._Bill]

The little yellow icon is lit & the start stop message is Stop/Start Unavailable Service Stop/Start System

The ESS icon being lit with the Service ESS message usually means the Aux battery failed the startup test. I have had that showing all summer. My main battery failed and was replaced about a year ago. The Aux battery went about six months later. I have a new one to install, just haven't got it done yet. As long as I drive it enough to keep the Main battery charged, it's not a problem, just an error light at every startup.

 

[Lunentucker]

If it's a 2020 it's time for at least one new battery, if not both.

 

[Myronlucan]

The ESS icon being lit with the Service ESS message usually means the Aux battery failed the startup test. I have had that showing all summer. My main battery failed and was replaced about a year ago. The Aux battery went about six months later. I have a new one to install, just haven't got it done yet. As long as I drive it enough to keep the Main battery charged, it's not a problem, just an error light at every startup.

Thank you

 

[Hootbro]

I would be surprised if the Fluid Film was a direct cause unless whomever was applying it was slapping the applicator wand around like a blind man with a walking cane.

 

[berb]

Go ahead an change out the aux battery. If you let it go too long the Jeep will start to have issues starting, even if your main battery is fine. My main battery was good, but the aux battery failed and we couldn't start our jeep. I couldn't believe it. A new aux battery fixed everything.

 

[Pilsner]

Also check the hood switches. Not sure why that would have been adjusted, but both need to be connected and in position for it to work. I have one out to avoid ASS.

 

[B-RAD]

I have a 2021 with very low mileage and my auxiliary battery went bad and caused the system to not work. Once replaced all is good.

 

[Wynfuller]

2020 gladiator sport “service start stop system”. Both batteries are good including the load test. F32 and F42 fuses are good. K8 relay is good. Light will not go off. Constant circled A with ! Any more possible ideas on the issue?

 

[Lost1wing]

I thought when that light comes on, is because it failed the start up test. Make sure both batteries are fully charged and reset the IBS. I'm sure there are other reasons like loose battery cables. Just because you tightened the clamps doesn't mean the clamps are secured to the post. Double check your connection.

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