Temp gauge maxed in red right after start up

[Mister Lamb]

As soon as I'm up and running, I'm ordering the Genesis dual battery set up.

Excellent choice. That's on my purchase list as well... Make a thread wherever appropriate with install/thoughts on the kit. I'm sure there are plenty of users on here interested in the upgrade.

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[cuellar13]

ShadowsPapa is not wrong. May not be the answer either. It could very well be as simple as the coolant temp sensor having an internal short.
Hard to say.
If all is good when it’s cold and then it gets wonky when it’s hot maybe it’s a short. ?‍
Follow me for a moment...
So it’s cool and no issues. Then it heats up. Everything reaches operating temperature. Metal begins to expand...

So if the internal wires were haphazardly placed in the sensor on the production line and then they expand and move, and make contact, it could be the issue.

There are literally thousands of what if’s and could it be’s that could cover this.

The “smarter” they make cars, the less able we are to depend on them when there is a tiny insignificant system failure.

Trust me, I get it. The initial problem happened when the truck was cold, and the new situation happened when the truck was cold, as well. That's why I'm going with the original issue first (coolant temp sensor) since it's just a $30 part and a half hour of my time. @ShadowsPapa presented perfect logic for it. After working in the auto industry for so many years, I'm also not blind to the fact that batteries in FL rarely get 3 years out of them, and I have original batteries in my 2020 JTR. When I get home, the Genesis system and two Optima Red Tops are going in (and probably some sort of lock, lol). I'm not typically one to throw parts at a ride, but the temp sensor is cheap (and sold out in many places, hmmmm...) and the dual battery set up was already on my "to do" list- the issues this weekend just made it an easier conversation with the wife, lol. If the two of those don't fix it, off to the dealer it is.

 

[Holes]

Trust me, I get it. The initial problem happened when the truck was cold, and the new situation happened when the truck was cold, as well. That's why I'm going with the original issue first (coolant temp sensor) since it's just a $30 part and a half hour of my time. @ShadowsPapa presented perfect logic for it. After working in the auto industry for so many years, I'm also not blind to the fact that batteries in FL rarely get 3 years out of them, and I have original batteries in my 2020 JTR. When I get home, the Genesis system and two Optima Red Tops are going in (and probably some sort of lock, lol). I'm not typically one to throw parts at a ride, but the temp sensor is cheap (and sold out in many places, hmmmm...) and the dual battery set up was already on my "to do" list- the issues this weekend just made it an easier conversation with the wife, lol. If the two of those don't fix it, off to the dealer it is.

OMG!?
Three years from a battery in Florida? Holy phuck!!!
I thought Minnesota was bad. But you can get between five and ten years here. Depending. Depending on lot’s of things. But holy schit. Three years in Florida...

Just one more reason why we will stay up north. I cannot stand the heat. And thank God, although my wife loves Florida, she cannot stand the heat either.
We’re heading towards Montana. I would prefer farther north in Montana.
?

 

[Rusty PW]

My 2011 Nismo still has the OEM battery in it. The '08 Power Wagon OEM battery went 10 yrs. The '13 Grand Cherokee still had the OEM battery in it when I got rid of it this past Feb. The '09 diesel motorhome would eat batteries. 2 engine batteries and 4 house batteries about every 3 to 4 yrs. Over $1,000 a pop.

 

[ShadowsPapa]

OMG!?
Three years from a battery in Florida? Holy phuck!!!
I thought Minnesota was bad. But you can get between five and ten years here. Depending. Depending on lot’s of things. But holy schit. Three years in Florida...

Just one more reason why we will stay up north. I cannot stand the heat. And thank God, although my wife loves Florida, she cannot stand the heat either.
We’re heading towards Montana. I would prefer farther north in Montana.
?

The original battery in my F250 went over 12 years. The original in my Silverado went 6 years. The battery in my Javelin is 6 years old. The battery in my SX4 is probably 4 years and going strong.
The only vehicle we've ever had battery issues with were my wife's 2018 Grand Cherokee. The dealer wasn't surprised, replaced both.

Modern charging systems have sensors for battery state of charge, temperature and other factors and should help batteries last longer in the heat because the killer is over-charging in hot temperatures. The IBS is actually supposed to report battery temperature back to the PCM so that it cuts battery charging when it's hot.
The days of heat killing batteries should be coming to an end.

 

[cuellar13]

The original battery in my F250 went over 12 years. The original in my Silverado went 6 years. The battery in my Javelin is 6 years old. The battery in my SX4 is probably 4 years and going strong.
The only vehicle we've ever had battery issues with were my wife's 2018 Grand Cherokee. The dealer wasn't surprised, replaced both.

Modern charging systems have sensors for battery state of charge, temperature and other factors and should help batteries last longer in the heat because the killer is over-charging in hot temperatures. The IBS is actually supposed to report battery temperature back to the PCM so that it cuts battery charging when it's hot.
The days of heat killing batteries should be coming to an end.

I hope the days of heat killing batteries are coming to an end! Quick update on the other situation: Drove the wife's Bronco an hour and a half to a dealer in Gainesville for the coolant temp sensor. Cost me a whopping $23.74 with tax. Drove the hour and a half back, and new sensor was in, in less than 10 mins. Temp gauge now showing accurate readings, CEL is still on, but I will reset that when I get back home tonight and have access to all of my shit (auto parts stores will no longer clear codes for you, nor let you do it yourself). This is the one time I didn't bring my programmer with me. Fingers crossed that all will be fine on the 3 hour drive home- I'll have two dogs and my teenage daughter with me.

 

[cuellar13]

Closeout to this thread- after replacing the Coolant Temp Sensor, made the 3 hour drive home, with zero issues. About an hour into the drive, we made a quick pit stop, and the CEL also went out on it's own (which I expected it to do, if the problem was fixed). No ESS or Adaptive Cruise errors anymore. @ShadowsPapa and his infinite file of tech info rationalized the ESS problem, but I still don't understand why I got the adaptive cruise error, and probably never will. Oh well, problem solved. I'll still be ordering the Genesis dual battery set up- when I had the slightest suspicion that the batteries were the issue, I called around and quickly found out that no one around me had the aux battery in stock, including dealers.

 

[ShadowsPapa]

Closeout to this thread- after replacing the Coolant Temp Sensor, made the 3 hour drive home, with zero issues. About an hour into the drive, we made a quick pit stop, and the CEL also went out on it's own (which I expected it to do, if the problem was fixed). No ESS or Adaptive Cruise errors anymore. @ShadowsPapa and his infinite file of tech info rationalized the ESS problem, but I still don't understand why I got the adaptive cruise error, and probably never will. Oh well, problem solved. I'll still be ordering the Genesis dual battery set up- when I had the slightest suspicion that the batteries were the issue, I called around and quickly found out that no one around me had the aux battery in stock, including dealers.

I'd have to dig for tech articles - but I'd also bet that the ACC is shut down in the event of abnormalities in certain systems. A lot of how the engine and even transmission behaves is based on things being normal and falling within certain boundaries.

Odd that no one had the batteries - the dealers here stock them. I'd not be surprised if NAPA had them on hand, too - and NAPA batteries are very good, highly rated (and made in USA)
Oops - just checked - NAPA has the crank battery, not the aux battery......... "Currently unavailable".
Checked O'Reilly's - same thing, out of stock.
I know the dealers have them, I discussed it with them just days ago, but seeing NAPA and O'Reilly's is out of stock for the AUX battery isn't fun news.

 

[cuellar13]

I'd have to dig for tech articles - but I'd also bet that the ACC is shut down in the event of abnormalities in certain systems. A lot of how the engine and even transmission behaves is based on things being normal and falling within certain boundaries.

Odd that no one had the batteries - the dealers here stock them. I'd not be surprised if NAPA had them on hand, too - and NAPA batteries are very good, highly rated (and made in USA)
Oops - just checked - NAPA has the crank battery, not the aux battery......... "Currently unavailable".
Checked O'Reilly's - same thing, out of stock.
I know the dealers have them, I discussed it with them just days ago, but seeing NAPA and O'Reilly's is out of stock for the AUX battery isn't fun news.

Yep, I asked everyone that I called for the temp sensor, if they had the aux battery, just in case. All the parts stores were out of stock, backordered, or nothing listed. The two closest dealers (within 75 miles) of where I was at, were both out of them too. Both dealers said they typically stock them, too. Definitely makes me nervous, since we spend at least 1/4 of our time at our cabin. I'm thinking that it'd be easier to find a group 25 battery, if I needed to...

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