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2018 Pacifica Gas models with ESS have a small auxiliary battery right next to the main battery.
My question is: When at a stop and the engine is shut down, which battery is running the AC, Entertainment, Lights, wipers, etc? Is the small auxiliary battery used to run that stuff, or is it isolated and saved for restarting the gas engine?
It doesn't matter, as long as it all works, but I'm curious.
 

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2018 Pacifica Gas models with ESS have a small auxiliary battery right next to the main battery.
My question is: When at a stop and the engine is shut down, which battery is running the AC, Entertainment, Lights, wipers, etc? Is the small auxiliary battery used to run that stuff, or is it isolated and saved for restarting the gas engine?
It doesn't matter, as long as it all works, but I'm curious.
The small battery powers the majority of the electrical needs of the van when the engine shuts off, which reserves the larger cranking battery for engine starting. This is from the factory shop manual:

How does the ESS system function - simple overview:

- ESS shuts the engine off when the vehicle stops

- The vehicle has to be stopped for a pre-set time before the engine is switched off

- Then, it restarts when the driver releases the brake to move the vehicle

- The system senses brake pedal position and vehicle speed to determine that the vehicle is moving

- Powertrain calibration makes the decision when to shut off the engine and when to restart the engine again

- The ESS function is transparent to the driver

- When the engine stops, a smaller secondary battery keeps accessory features powered, like the fan, wipers, headlights, audio system, etc.

- A Dual Battery Control and Power Relay Control are used to smooth out voltage dips when the starter cranks the engine
 

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The AC compressor is run off the engine, so it is not actually cooling when the ESS system stops the engine. The fan is kept running by the smaller battery, blowing the residual cool air into the cabin. As soon as the system senses that the residual cool is no longer cool enough, the engine will restart, even if you are still waiting for a green light.
 

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Great Info Guys, I love this place. Empowered with this knowledge, I'm thinking about powering my dashcam from the small aux battery for extended parking mode :)



The small battery powers the majority of the electrical needs of the van when the engine shuts off, which reserves the larger cranking battery for engine starting. This is from the factory shop manual:

How does the ESS system function - simple overview:

- ESS shuts the engine off when the vehicle stops

- The vehicle has to be stopped for a pre-set time before the engine is switched off

- Then, it restarts when the driver releases the brake to move the vehicle

- The system senses brake pedal position and vehicle speed to determine that the vehicle is moving

- Powertrain calibration makes the decision when to shut off the engine and when to restart the engine again

- The ESS function is transparent to the driver

- When the engine stops, a smaller secondary battery keeps accessory features powered, like the fan, wipers, headlights, audio system, etc.

- A Dual Battery Control and Power Relay Control are used to smooth out voltage dips when the starter cranks the engine
The AC compressor is run off the engine, so it is not actually cooling when the ESS system stops the engine. The fan is kept running by the smaller battery, blowing the residual cool air into the cabin. As soon as the system senses that the residual cool is no longer cool enough, the engine will restart, even if you are still waiting for a green light.
 

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2017 Chrysler Pacifica Gas models with ESS small auxiliary battery stopped working as of 6/2/2018. This has affected the start from a distance on the Key Fob. The Authorized Dealer "Auto Nation" parts manager and service manager stated that the auxiliary battery has been on back order for over a month. (there are over 27 other owners waiting for the battery) Chrysler is not or has not filled any axulliary battery back orders. What is happening???. We've only had the vehicle a year w/9000 miles. Is this the start of future problems with this ESS system??? This was the main feature that attracted us to this vehicle.

We live in hot a climate and in the summer 95 degree or more then feels like 105. So to start the car from a distance and have it cooled when you get to it is a keeper. :); of course when it is working.
 

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Chrysler pacifica 2017

I have a 2017 Pacifica and I got a powertrain code and then the whole car locked up and the car thought it was on but nothing would work. I take it to dealership and they claim its the auxiliary battery and that battery also killed my regular car battery so now i have a car that is two years old and I have the extended warranty and none of this is covered? I bought a new car so I would not have these problems. so now I pay for my car and I pay for a warranty and I am now paying over 600.00 to repair a car that is ONLY two years old and not to mention I think this extremely dangerous that a car just locks up like this, I am told since I am at 41000.00 miles I am out of luck and nothing is covered under the extended warranty. This was my second Chrysler van but it will now be my last. if this is how you do business when this is a known problem with this car.
 

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I have a 2017 Pacifica and I got a powertrain code and then the whole car locked up and the car thought it was on but nothing would work. I take it to dealership and they claim its the auxiliary battery and that battery also killed my regular car battery so now i have a car that is two years old and I have the extended warranty and none of this is covered? I bought a new car so I would not have these problems. so now I pay for my car and I pay for a warranty and I am now paying over 600.00 to repair a car that is ONLY two years old and not to mention I think this extremely dangerous that a car just locks up like this, I am told since I am at 41000.00 miles I am out of luck and nothing is covered under the extended warranty. This was my second Chrysler van but it will now be my last. if this is how you do business when this is a known problem with this car.
Not sure what you mean by "extended warranty." The bumper to bumper is 3 years / 36K, and you are 5K over that. If you bought one of the usual extended warranties, I would think it would be covered, but you should read the exclusions. If you are thinking the 5 year/60K powertrain warranty, it is the engine itself, transmission, etc -- very few if any auxiliary items (like alternator, electronic controls, etc.)

According to https://www.chrysler.com/crossbrand/warranty/pdf/Minivan.pdf the engine parts covered on (listed on pages 9 & 10) are:

Gasoline Engine: cylinder block and all internal parts; cylinder head assemblies; timing case, timing chain, timing belt, gears and sprockets; vibration damper; oil pump; water pump and housing; intake and exhaust manifolds; flywheel with starter ring gear; core plugs; valve covers; oil pan; turbocharger housing and internal parts; turbocharger wastegate actuator; supercharger; serpentine belt tensioner; seals and gaskets for listed components only.


You need to ask the dealer why it is not covered under an extended warranty you purchased -- maybe contact the salesperson if you are at the dealer you purchased the van from.

You can also try to reach out to @ChryslerCares (or by phone.)

Batteries are a known problem but not limited to Chrysler, but the extent is not clear. Remember that there are over 300K Pacificas out there, making the number of problems posted here a very tiny percentage (which is little consolation if it is you.) It would be nice, though, if Chrysler would on its own extend the battery warranty in light of the problems highlighted on these forum pages. If it is widespread they should, and if it is rare, the good vibes would be a plus at small cost.
 

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I would add that one thing is extremely clear -- low voltage on batteries drives the warning systems nuts with unrelated error codes. That is a warning in and of itself.
 

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I have a 2017 Pacifica and I got a powertrain code and then the whole car locked up and the car thought it was on but nothing would work. I take it to dealership and they claim its the auxiliary battery and that battery also killed my regular car battery so now i have a car that is two years old and I have the extended warranty and none of this is covered? I bought a new car so I would not have these problems. so now I pay for my car and I pay for a warranty and I am now paying over 600.00 to repair a car that is ONLY two years old and not to mention I think this extremely dangerous that a car just locks up like this, I am told since I am at 41000.00 miles I am out of luck and nothing is covered under the extended warranty. This was my second Chrysler van but it will now be my last. if this is how you do business when this is a known problem with this car.
Hi j13h22,
We understand your frustration. If you would like to send us a private message, we will gladly look into this to see if there's anything we can do on our end to help you out.
Lydia
Chrysler Social Care Specialist
 

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2017 Chrysler Pacifica Gas models with ESS small auxiliary battery stopped working.

2017 Chrysler Pacifica Gas models with ESS small auxiliary battery stopped working. i hate this car, i would never buy it again.i put a new battery ,it start if I start car every day, if I do not start car for 2 days then it will not start. even I bought the battery starter for over $150 but it would not start the car till someone give me jump.
I never has issue before with honda or toyota.
 

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I suspect that you have something other than a battery problem. IIWY, I would do a careful check of all the wiring that is close to the batteries and alternator. Look for a loose wire, and pay particular attention to ground connections. If all is well, consider the alternator. If when the car is running, the voltage indicator shows 13.6 volts or better, it is probably not the alternator. Please tell us which battery that you replaced, ESS or main. This is a simplistic approach and YMMV.
 

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To me there seems to be something wrong when so many aux batteries fail in less than a year. I wonder if it's too small a capacity. Works fine for a while then can't be charged. If it's some flavor of lead acid then the battery must be deep cycling too often. The thing that seems to be killing any lead acid battery is debris from the lead plates (lead oxide, lead sulfate etc.). This seems to me possibly caused by running the battery so low and charging over and over.
 

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The only thing certain about this whole ESS/battery not charged thing is that something is rotten. Starting with the system engineering and then integrating the FCA engineering of a system that works on many if not most other vehicles that use it. FCA seems to have screwed up something in the Pacific installation. We bought our Pacifica with only 15 miles on it in January 2018. By February, the ESS was already failed and had to have a lengthy (days long) investigation by the dealer only to learn that they needed parts that weren't available. When the parts were finally available, it required 3 days of work on their part to install the part (a little thing called the IBS which is part of the battery hookup), check the system again (to include both batteries), teach the car how to start and run, and then basically deep discharge and recharge the batter a number of times. The fixed ESS worked for about 3 days and failed again due to "needs charging." For about six months the ESS was intermittently operational - sometimes it would work, most of the time it wouldn't work. For the past 4 months or so it doesn't work at all to include long driving situations which should have recharged the United States Electrical Grid but not that little stinking battery that runs the ESS. Nothing FCA does or thinks about doing will resolve the issue until such time as they get hauled into court by the government for using this inoperable system to justify a claim for better gas mileage. And don't say @ChryslerCares can help - they can't. The ESS system is just bad and no one knows how to fix an installation that doesn't work. If you have a Pacifica that the ESS works on be thankful but don't be surprised when your system fails just like those of us whose systems failed from day one and could never be fixed.
 

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and then basically deep discharge and recharge the batter a number of times.
Yikes! A number of times? Personally, I would label those batteries as hosed at this point. Modern batteries ain't like they used to be; they're finicky about getting discharged like that.

Figure out a way to drop in new (and hopefully non-Chrysler) batteries in and see how it goes.
 

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The only thing certain about this whole ESS/battery not charged thing is that something is rotten. Starting with the system engineering and then integrating the FCA engineering of a system that works on many if not most other vehicles that use it. FCA seems to have screwed up something in the Pacific installation. We bought our Pacifica with only 15 miles on it in January 2018. By February, the ESS was already failed and had to have a lengthy (days long) investigation by the dealer only to learn that they needed parts that weren't available. When the parts were finally available, it required 3 days of work on their part to install the part (a little thing called the IBS which is part of the battery hookup), check the system again (to include both batteries), teach the car how to start and run, and then basically deep discharge and recharge the batter a number of times. The fixed ESS worked for about 3 days and failed again due to "needs charging." For about six months the ESS was intermittently operational - sometimes it would work, most of the time it wouldn't work. For the past 4 months or so it doesn't work at all to include long driving situations which should have recharged the United States Electrical Grid but not that little stinking battery that runs the ESS. Nothing FCA does or thinks about doing will resolve the issue until such time as they get hauled into court by the government for using this inoperable system to justify a claim for better gas mileage. And don't say @ChryslerCares can help - they can't. The ESS system is just bad and no one knows how to fix an installation that doesn't work. If you have a Pacifica that the ESS works on be thankful but don't be surprised when your system fails just like those of us whose systems failed from day one and could never be fixed.
I wonder if some of the ESS problems can be traced back to the V53 recall for cleaning up the ground area for sealer in the wrong place...???
 

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I don't think the V53 recall will afffect the ESS problems. My Pacifica had V53 complied with on 17 May and there has been no change in the ESS operation - or rather the lack of operation.
 

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Similar symptoms... does this sound like ESS battery?

Vehicle is 1 year old.


Approx three weeks ago, got the A! warning light on dash. Indicates auto stop/start not functioning.


Middle of last week, car behaved erratically when started. Interior lights flashed on off (no pattern.)


Last last week, remote start on key fob caused windshield wipers to turn on!


Now vehicle is dead as disco. No lights on entry. No lights when attempting to start. Starter not clicking over, nothing.


Attempting to jump start with a Black & Decker jump pack (charged jump pack overnight.) All dash and interior lights flicker weakly, but no activity from starter. Jump pack reports its battery drained almost immediately. (Something fishy... if it really moved that much power in 1 - 2 seconds, there would be a lot of heat!)


This seems similar to other reports on this thread: ESS non-functional leads to ESS aux battery drained leads to main battery drained.


(Another post mentioned fuses loose... I did reseat all fuses and relay, and many of them were _very_ loose. No change to symptoms though.)
 

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Vehicle is 1 year old.


Approx three weeks ago, got the A! warning light on dash. Indicates auto stop/start not functioning.


Middle of last week, car behaved erratically when started. Interior lights flashed on off (no pattern.)


Last last week, remote start on key fob caused windshield wipers to turn on!


Now vehicle is dead as disco. No lights on entry. No lights when attempting to start. Starter not clicking over, nothing.


Attempting to jump start with a Black & Decker jump pack (charged jump pack overnight.) All dash and interior lights flicker weakly, but no activity from starter. Jump pack reports its battery drained almost immediately. (Something fishy... if it really moved that much power in 1 - 2 seconds, there would be a lot of heat!)


This seems similar to other reports on this thread: ESS non-functional leads to ESS aux battery drained leads to main battery drained.


(Another post mentioned fuses loose... I did reseat all fuses and relay, and many of them were _very_ loose. No change to symptoms though.)

Hello mtnygard,

Please keep us updated on this concern going forward. If you decide to schedule an appointment with your dealer, we can provide an additional layer of assistance while in service.

Lamar
Chrysler Social Care Specialist
 

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Vehicle is 1 year old.


Approx three weeks ago, got the A! warning light on dash. Indicates auto stop/start not functioning.


Middle of last week, car behaved erratically when started. Interior lights flashed on off (no pattern.)


Last last week, remote start on key fob caused windshield wipers to turn on!


Now vehicle is dead as disco. No lights on entry. No lights when attempting to start. Starter not clicking over, nothing.


Attempting to jump start with a Black & Decker jump pack (charged jump pack overnight.) All dash and interior lights flicker weakly, but no activity from starter. Jump pack reports its battery drained almost immediately. (Something fishy... if it really moved that much power in 1 - 2 seconds, there would be a lot of heat!)


This seems similar to other reports on this thread: ESS non-functional leads to ESS aux battery drained leads to main battery drained.


(Another post mentioned fuses loose... I did reseat all fuses and relay, and many of them were _very_ loose. No change to symptoms though.)
I think your jump pack is low on voltage or you have a couple of bad cells. I would get it load tested at the parts store. To discharge a healthy fully charged battery in a couple of seconds is practically impossible without something exploding. A fully charged battery should be around 12.7-12.8 volts. A 12V battery at 12 volts is pretty much dead for any real power.
 

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I have the Same problem just bring my care to the dealer they said my auxiliary battery is bad and I have to change a new one. I just bought my car for 2 month and also bought the extended Warenty to 100k mile. Chrysler on capitol San Jose said it not cover I have to pay $360 if I don’t want to charge the auxiliary battery and take the car back home I have to pay for the service charge for looking at it for $190. What kind of business is this. This is my last Chrysler pacific.
 
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