Case Number: S1408000384 Rev. E
Release Date:

June 2024

Symptom/Vehicle Issue: Start Stop Charging Warning Lamp Illuminated On, Intelligent Battery
Sensor (IBS) State of Charge (SOC) Inaccurate, Battery Charging Message, Presence of IBS related
Diagnostic Trouble Codes (DTCs), or Battery Warning Lamp On

Discussion: The IBS measures voltage, current and temperature. From these core
measurements, it estimates other characteristics of the battery such as SOC and battery internal
resistance.
This document provides added information about the IBS to avoid incorrect and unnecessary
IBS replacement. For most IBS returns, the IBS engineering team and supplier find no issue with the
returned parts. Please ensure claim narratives list and reference any DTCs mentioned in this
document and state the DTCs set at time of IBS replacement. A replacement IBS is not required on a
vehicle without DTCs.
Note: In most cases, the IBS can self-recover from a functional software defect if the two-way
connection gets cycled (i.e., resets/reboot the module). The IBS will then function normal
again, however; it will need a quiescent (vehicle completely sleep) period of ~2 to 4 hours to
calibrate SOC to the connected battery.

Battery Exchange
IBS DOES NOT NEED TO BE REPLACED WITH NEW OR RECHARGED BATTERIES. However, it
might require SOC adaptation.

IBS SOC Adaptation (Learning)
Learning needs 1 crank and 2-4 hours of quiescent/sleep time.
Quiescent/Sleep time is defined as Quiescent phase: [-500mA, 50mA] battery current.
If unsure of quiescent state current, disconnect the vehicle ground cable (example below: Vehicle
battery ground/charge point) from the IBS to guarantee no current flows through the battery during
this period. IBS 2-way connection and clamp connection to battery negative post should remain
connected for the IBS to operate. After completion of quiescent state, re-connect the ground back to
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

the IBS. In normal operation, all current flowing through the battery needs to pass through the IBS for
proper reading.

IBS Functional Internal Monitoring
IBS software monitors itself for defective behavior which can trigger DTC B2193 on the Body Control
Module (BCM) end. This defect occurs on rare occasions.
DTC U113E is a related DTC set by the BCM in the event of Local Interconnect Network (LIN)
communication not responsive. Using, the IBS power reboot (reset) can sometimes help clear these
faults.
IBS Related DTCs (set by BCM):
➢ B2193: Intelligent Battery Sensor Internal
➢ U113E: Lost communication with intelligent battery

DTC B2193
If you observe an active DTC B2193, reset the IBS by cycling the 2-way connection. Then start the
vehicle and wait for about 30 seconds to determine if the DTC clears or it changes to a stored DTC. If
you find it no longer exhibits an active fault, then it is appropriate to keep the same IBS. Else if an
active DTC B2193 remains, replace the IBS.

DTC U113E and LIN Diagnostics
If you observe an active DTC U113E set by the BCM, it means a defect exists in the LIN bus.
BCM monitors IBS data when IGN ON.
This defect can occur due to a wiring defect in the LIN bus created by short/open LIN bus circuit, or
IBS fuse. Moreover, it can relate to an internal IBS or BCM defect in hardware or software under rare
circumstances.

U113E DTC Root Cause Inspection:
1. Read vehicle DTCs while the IGN ON.
2. Wiggle the IBS 2-way harness takeout (LIN and IBS feed takeout) and monitor the state of
DTC U113E.
o If this step affects U113E behavior, the issue is likely related to a failure in the harness.
3. Verify power to IBS by back probing the IBS 2-way connector (pin 2, “RD” wire).
o If voltage is lower than 11.8V, follow normal procedures for low batteries.
4. Verify IBS feed fuse state. Replace the fuse if needed.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

5. Verify LIN bus activity with Mopar scope.
o Config scope to LIN monitor if feasible.
o Replace the IBS only based confirmation from the LIN diagnostic.

DTC P00FD
This DTC relates to ECM diagnostic of the Aux battery. If ECM detects a voltage delta above allowed
limit between Aux and Main battery, this DTC get set. Please also note that ECM latches ON to this
fault even after the delta voltage returns to an acceptable level unless cleared with a service tool.
P00FD is not related to the IBS. Never replace IBS for P00FD.

Proper Battery Charging
In-Vehicle systems is not an issue. Please note to charge through the IBS or tie negative clamp to
Body/engine ground. Customers, Dealers, Mechanics, and Engineers usually want to place the
negative clamp on the pole of the battery. This creates Blind charging. “DO NOT BLIND CHARGE”
See below proper connections for charging.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

➢ IBS SOC adaptation is needed after charging the batteries.
➢ Note IBS will self-adapt in the next available quiescent state.
➢ A common misdiagnosis is Battery light illuminated. The IBS has NOTHING to do with this
light. The battery Light is indicative of a “CHARGING SYSTEM and condition of the battery”

START/STOP INOP
ESS INOP can occur due to many factors not related to the IBS functionality. Moreover, ESS can get
inhibited if battery SOC (state of charge) falls below the allowed SOC level. The SOC level varies
depending on temperature since temperature affects the battery performance. The SOC state is
monitored by the PCM and BCM. Battery temperature and SOC (State of charge are critical) see
chart for start stop engine on conditions.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

Example Display on a start stop vehicle.

➢ The IBS should only be replaced if a DTC for the IBS is active.

Stop-start Engine ON conditions:
1.
2.
3.
4.

Gear and brake switch conditions valid
Completed initial engine key start
Occupant sensed allowing engine start conditions
OBD conditions met allowing engine start conditions SOC (State of Charge) values found
under OBDII monitors using wiTech 2 – example below.
5. Vehicle hood is closed

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

IBS State of Charge (SOF) tool display.

New IBS Installation
1. If the Installation of a new IBS sensor is required it should be onto a fully charged battery.
2. Once installed allow the sensor to read the SOC for up to 4 hours without added system loads.
3. Performing from 3 to 5 drive cycles with an 8-hour key off period will improve calibration accuracy
of the new sensor for proper operation.
4. Continue the drive cycles to allow proper adaption of the battery sensor State of Charge (SOC) and
State of Function (SOF).

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13

This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Center
Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate
course of action.
Chrysler Group LLC

Contact the STAR Center for assistance if no solution is found

Version 5/23/13