ESS Reset - 2017+ Chrysler Pacifica Minivan Forums
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Old 03-06-2019, 11:59 AM Thread Starter
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ESS Reset

Like so many others, the ESS in my van had over time gone to showing “battery charging” all the time, and never activating. I haven’t noted any signs of battery or electrical problems, everything works fine and no funny behaviors. Last week I put 1000+ miles road tripping in the van, and ESS never came active.

This past weekend I needed to clean the interior of the van, it got well and thoroughly trashed during a week long hiking trip to the Big Bend. Because the doors would be open for a few hours, I went ahead and disconnected both batteries by removing the negative power leads, to avoid any risk of discharging them. Low and behold, ESS started working normally the next day and has been fine since.

I had a feeling the main issue with ESS was confusion in the software that calculates the State of Charge of the batteries, and this reset seems to confirm it. We will see how long before it goes wonky again. Now, whether this is a bug or a feature is another discussion.
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Old 03-06-2019, 01:38 PM
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With this being our fifth Chrysler minivan over the last 29 years, I learned early on that the cure to many electrical gremlins was to disconnect the battery, wait 5 - 10 minutes, then reconnect it. Solved problems from a transmission that didn't shift right after I changed out the ATF-3 fluid to windshield wipers that appeared to be obsessed. BTW, the dimmer switch on the lower left of the dash can turn off all of the interior lights when you want to leave the doors open. Roll the switch all the way down until you feel/hear it click. Don't forget to turn it back up when done as it also controls the driver's dash lights, too! I believe this feature is on all trim levels.
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Old 03-06-2019, 04:44 PM
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Quote:
Originally Posted by Shadow5501 View Post
Like so many others, the ESS in my van had over time gone to showing “battery charging” all the time, and never activating. I haven’t noted any signs of battery or electrical problems, everything works fine and no funny behaviors. Last week I put 1000+ miles road tripping in the van, and ESS never came active.

This past weekend I needed to clean the interior of the van, it got well and thoroughly trashed during a week long hiking trip to the Big Bend. Because the doors would be open for a few hours, I went ahead and disconnected both batteries by removing the negative power leads, to avoid any risk of discharging them. Low and behold, ESS started working normally the next day and has been fine since.

I had a feeling the main issue with ESS was confusion in the software that calculates the State of Charge of the batteries, and this reset seems to confirm it. We will see how long before it goes wonky again. Now, whether this is a bug or a feature is another discussion.
Please keep us ESS people updated on this

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Old 03-07-2019, 01:29 PM
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Quote:
Originally Posted by Shadow5501 View Post
Like so many others, the ESS in my van had over time gone to showing “battery charging” all the time, and never activating. I haven’t noted any signs of battery or electrical problems, everything works fine and no funny behaviors. Last week I put 1000+ miles road tripping in the van, and ESS never came active.

This past weekend I needed to clean the interior of the van, it got well and thoroughly trashed during a week long hiking trip to the Big Bend. Because the doors would be open for a few hours, I went ahead and disconnected both batteries by removing the negative power leads, to avoid any risk of discharging them. Low and behold, ESS started working normally the next day and has been fine since.

I had a feeling the main issue with ESS was confusion in the software that calculates the State of Charge of the batteries, and this reset seems to confirm it. We will see how long before it goes wonky again. Now, whether this is a bug or a feature is another discussion.
I had the same issue and the fix was to replace both batteries. As soon as they did that ESS started to work. It took me two visit to the dealer and in both cases they tested the batteries. The first day they tested only the small battery and while the battery life was about 65% and passing test that was not good enough to make the ESS working. The Second day they started by testing the big battery which I had it tested in a pepboys. Pepboys told me that while the battery was still good one of the test failed the one about the crank power (or something like that). I told Chrysler all about Pepboys tests and when they tested the big battery they found it bad. The big battery test lasted like 2 hours or more. After that they tested the aux battery and this time it failed so they ended replacing both batteries.

While waiting in the dealer (more than 10 hours in two days) the guy working on my car told me that both batteries were failing a lot and that the small battery was failing so much that they had it in backorder.

My car is about 1.1 year old and I'm thinking about replacing the small battery the next time this happens with a better one from some other company. I have been thinking about using a Capacitor based battery (https://www.amazon.com/d/Automotive-...0BC/B00EUFCHR0 ) or just a better one (https://www.amazon.com/DieHard-02838...ll-spons&psc=1)

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Old 03-07-2019, 01:44 PM
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I'm thinking that one of these can easily replace the AGM battery.

https://www.ebay.com/i/262698897946?...3D262698897946

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Old 04-14-2019, 12:22 PM Thread Starter
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Following up. ESS was active for about a week, then went back to “battery charging.” It spent about a month dormant/on vacation. Today out of the blue it magically started working again. No idea why, nothing I can identify has changed. Have mostly been running around town doing 10-20 minute drives, with a few runs up to 45 minutes over the last month. Today it kicked in after 5 minutes. So strange.
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Old 04-14-2019, 04:16 PM
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Quote:
Originally Posted by Shadow5501 View Post
Following up. ESS was active for about a week, then went back to “battery charging.” It spent about a month dormant/on vacation. Today out of the blue it magically started working again. No idea why, nothing I can identify has changed. Have mostly been running around town doing 10-20 minute drives, with a few runs up to 45 minutes over the last month. Today it kicked in after 5 minutes. So strange.
Mine barely ever worked over winter but now that its warming up it works fine. I think its just a junk battery design that cant handle the colder temps, still wrapping my head around it has two batteries.
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Old 04-15-2019, 07:28 AM
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Quote:
Originally Posted by Lily View Post
Mine barely ever worked over winter but now that its warming up it works fine. I think its just a junk battery design that cant handle the colder temps, still wrapping my head around it has two batteries.
Lily, this is interesting to hear. The same thing is happening for me. Now that the weather has warmed (ignoring the 5 inches of snow in Chicagoland yesterday), the ESS is working much better. It actually comes active on shorter trips again. Of course, no one at the dealership has a clue of how ambient temperature affects ESS.

For me, it is what it is for now.

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Old 04-15-2019, 07:38 AM Thread Starter
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Quote:
Originally Posted by Lily View Post
Mine barely ever worked over winter but now that its warming up it works fine. I think its just a junk battery design that cant handle the colder temps, still wrapping my head around it has two batteries.
I live in south central Texas. It hasn’t been anything like cold here since the end of February, and we had an unusual 90F afternoon last week. No ESS through any of it. In my case I don’t think it’s the weather. I wonder if it could be some secondary effect based on changes to the charging voltage generated by the electrical system based on the warmer temperatures. Lead acid batteries require lower charging voltage at higher temps. Dunno.
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