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Discussion Starter #1
I, too, have had issues with my Auxiliary battery on my 2018 Chrysler Pacifica. We didn't like the stop/start feature, and honestly, rarely are in a city where it would need to function, anyway (90% hwy driving). When seeking help from our dealer, he explained that since was turned it off all the time, the battery never got the opportunity to re-charge and so it died. They wanted $290 for the battery plus labor for exchanging it out, and my extended warranty didn't cover batteries. So we went home, and replaced it for $151. After the new battery was in place, the warning light did not go out. So I drove the 45 miles back to my dealer, asked them if they could turn it off. They said the battery would have to "learn" to charge itself, and would start working again soon. When it did so, the light would go out on its own. 200 miles later, light still on, and I am afraid I've wasted the money on my new auxiliary battery. Can anyone tell me if their warning light stayed on after the new battery was installed and if it did INDEED learn to recharge itself??

805 Posts
Check other threads (search for IBS.) There is something called the Intelligent Battery Sensor (?) that monitors them. It is not clear to me if both ICE and hybrids have them. In any case, maybe the store that replaced the battery did not reset it or properly reconnect it.

This system can cause a lot of issues. This thread (see post 41 at https://www.pacificaforums.com/threads/ess-battery-charging.31458/page-3#post-527687) also indicates that a failing main battery can also create problems -- something that we see a lot of. Both this and the thread below indicate to me that replacing the battery is not a casual DIY task.

This is a sample post from another thread: (post 211) Thie link should land you near it.

That’s true, the Infernal battery system has screwed many DIY’s and caused new problems and extra expense.

BMW does not tolerate un-informed labor and has many “traps” for the DIY’er that are actually been normal practice for the last 100years - Stems from asking why are we still doing things the same old way?.. it’s 100year old knowledge after all.

The coding sets the alternator charge rate and voltage maximums. And as a battery ages it’s chemistry changes and is adapted to by the charge system. A 10yr old battery wont take 100% of the charge current it did when new and will accelerate the decay by overcharging it.

A new battery being treated like a 10yr old battery will abuse it from undercharging and cause sulfation damage.

The coding is critical to match the alternator output to the battery current acceptance. A small 60aH will be overcharged if it’s set for 105aH because the battery will not accept the current supplied and will cook the battery.

The AGM/non AGM marker changes its aging parameters and cold charge voltages. Flooded batteries are capable of handling 16v cold but AGM limits it to 15v.

It makes sense, but doesn’t help if you don’t have the tools. But TBH you can simply download a phone based OBD app that can reset this stuff and is not “dealer only”.

Just need to know about it, or your screwed! Much like many BMW innovations.

Good luck. It is interesting that your dealer had the battery in stock. There are a lot of posts about supply issues.

365 Posts
I was looking for a nice ODB reader that was Bluetooth that would work on iPhone / iPad but didn't really find much so I bought the BlueDriver odb reader for $99 and I am very happy with it. I can scan and reset allot more things with it than a cheap reader.

"Buy Nice or buy twice, buy once cry once" as they say.

4 Posts
When seeking help from our dealer, he explained that since was turned it off all the time, the battery never got the opportunity to re-charge and so it died.
This is total hogwash. The system keeps the battery charged whether ESS is used or not.

107 Posts
The only way to get the warning to turn off is to fix the problem. We just started getting the Start Stop unavailable/Service Start Stop messages. I was able to retrieve the following stored trouble codes:

U0418 - Implausible Data Received From Brake System Control Module 1
U0432 - Invalid Data Received From Multi-Axis Acceleration Sensor Module
P00FD - Battery -B- State Of Charge Performance

I found a TSB that mentions a PCM update that addresses multiple issues (some of which are related to ESS) and contains the codes I am getting. I suspect the OP may be having a similar issue. The fix according to the TSB is to flash the latest software to the PCM. I plan on taking the van back to the dealership later this week to get ours fixed. Our van is just out of warranty so I'm hoping they'll either perform the fix in good faith or charge me a discounted rate to apply the update.

NUMBER: 18-001-19 REV. C
GROUP: 18 - Vehicle Performance
DATE: June 12, 2019
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC. This bulletin supersedes Service Bulletin 18-001-19 REV. B, dated May 01, 2019, which should be removed from your files. All revisions are highlighted with asterisks and include additional symptom/condition, new RRT number, Inspection and LOP. This Service Bulletin is also being released as Rapid Response Transmittal (RRT) 19-043, dated June 12, 2019. All applicable Sold and Un-Sold RRT VINs have been loaded. To verify this RRT service action is applicable to the vehicle, use VIP or perform a VIN search in DealerCONNECT/Service Library. All repairs are reimbursable within the provisions of warranty.

SUBJECT: Flash: Powertrain Control Module (PCM) Updates
OVERVIEW: This bulletin involves reprogramming the PCM with the latest available software.
MODELS: 2018 (RU) Chrysler Pacifica
NOTE: This bulletin applies to vehicles within the following markets/countries: North America, LATAM, EMEA and APAC.
NOTE: This bulletin applies to vehicles equipped with a 3.6L V6 24V VVT Engine Upg I W/ESS (Sales Code ERC) or with a 3.6L V6 24V VVT Engine (Sales Code ERF).
SYMPTOM/CONDITION: Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one or more of the following DTCs have been set:

• P06E9 - Engine Starter Performance.
• U0418 - Implausible Data Received From Brake System Control Module 1.
• U0432 - Invalid Data Received From Multi-Axis Acceleration Sensor Module.
• P06EF - Engine Restart Performance. Software update will help reduce engine crank time, setting a false P06EF.
• P00FD - Battery -B- State Of Charge Performance.
• C2222-68 - Improper Powerdown - Event Information.
• P0607-00 - ECU Internal Performance - ESM.
• U0402-00 - Implausible Data Received From TCM.
• U145D-00 - Implausible Data Received From TCM On D-PT.
• U1465-00 - Implausible Driver Shift Request Signal Received.
• P0456 - EVAP System Small Leak.
• P258B - Electronic Vacuum Pump Performance.
• P0503 - Vehicle Speed Sensor 1 Erratic.

Customer may also experience one or more of the following:
Engine Start Stop (ESS) disabled during an autostart, requiring the driver to key restart (ERC Sales Code only).
• ESS message appears in the Electronics Vehicle Information Center (EVIC) “Stop/Start Restart Required Fault Detected” (ERC Sales Code only).
• Customer or technician may be unable to read data information from the OBDII connector when using a generic scan tool (ERF Sales Code, APAC only).
• Rough Idle.
• Vibration felt in the seat at Idle.
• Idle undershoot, just before a complete stop.

This software release also includes the following software enhancements:
• Prevent the ESS Aux battery from drying out on vehicles driven in hot regions and conditions.
• AGS controls modifications to reduce engine compartment temperatures.
• Limp home RPM correction in a double pedal fault scenario.
• Improvements to address an occasional engine stall during a panic brake situation from 45 kph (28 mph) on slippery road conditions.

Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library, verify all related systems are functioning as designed. If DTCs or symptom conditions, other than the ones listed above are present, record the issues on the repair order and repair as necessary before proceeding further with this bulletin. If a customer’s VIN is listed in VIP or your RRT VIN list, perform the repair. If any vehicle not on the VIN list exhibits the symptom/condition or DTC, perform the repair.

NOTE: The Transmission Control Module (TCM) must be updated to the latest available software at the conclusion of this repair procedure. Refer to all applicable published
service bulletins for detailed repair procedures and labor times regarding updating the TCM software.
NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do
not allow the charging voltage to climb above 13.5 volts during the flash process.
NOTE: If this flash process is interrupted/aborted, the flash should be restarted.

1. **Does the PCM control module have the latest software already installed?
• YES>>> This bulletin has been completed, use inspect LOP (18-19-06-9M) to close the active RRT.
• NO>>> Proceed to Step 2.**
2. Reprogram the PCM with the latest software. Detailed instructions for flashing control modules using the wiTECH Diagnostic Application are available by selecting the application’s “HELP” tab.
3. Clear any DTCs that may have been set in any modules due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.
4. Verify the TCM is programmed with the latest available software. Refer to all applicable published service bulletins for detailed repair procedures and labor times regarding updating the TCM software.

Reimbursable within the provisions of the warranty.
Labor Operation No / Description / Skill Category / Amount
18-19-06-9M / Module, Powertrain Control (PCM) - Inspect (0 - Introduction) / 1- Engine Repair and Performance / 0.2 Hrs.
18-19-06-9X / Module, Powertrain Control (PCM) - Inspect and Reprogram (0 - Introduction) / 1 - Engine Repair and Performance / 0.2 Hrs.

NOTE: The expected completion time for the flash download portion of this procedure is approximately 2 minutes. Actual flash download times may be affected by vehicle
connection and network capabilities.

The dealer must choose which failure code to use depending on if this is a Rapid Response Transmittal (RRT) or Service Bulletin.
• The “RF” failure code is required for essential module flash/reprogramming and can only be
used after confirmation that the VIN is included on the RRT.
• The failure code “RF” (Required Flash) can no longer be used on Service Bulletin flashes. The “RF” failure code must be used on an RRT.
• If the customer’s concern matches the SYMPTOM/CONDITION identified in the Service Bulletin, failure code CC is to be used. When utilizing this failure code, the 3C’s must be supplied.
RF Required Flash - RRT
CC Customer Concern
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