Need some help with this code B21E3-00

[Slate]

Google searches don’t come up with much. This is what JScan shows.

And yes I was using my winch.

Jeep has check engine light on. I do have the Genesis battery setup and I tested both batteries and they are fine, Jeep runs fine.

So the question is if I can reset the trouble code?

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[Slate]

@alphawolff

Paging Jeep Doctor Wolff to the medbay!

 

[alphawolff]

doctor says replace your 12v battery and performe a module reset of the IDCM. if code returns your IDCM has failed. as you have the genesis dual battery setup inspect all terminals for something loose. service information primarily points to a 12v issue. the following is what causes this dtc to set:


Theory of Operation
The Integrated Dual Charge Module (IDCM) is a Power Inverter and is comprised of the following two integral modules:

• On Board Charging Module (OCBM): Converts the AC voltage from the Electric Vehicle Supply Equipment (EVSE) Charging Port to a Direct Current (DC) voltage for the High Voltage Battery.
• Auxiliary Power Module (APM): Converts the high voltage DC power from the High Voltage Battery to a low voltage DC power for charging the Low Voltage Battery.

The IDCM is used to charge the Low Voltage and High Voltage Batteries. The IDCM is a stand alone module that does not contain any serviceable parts inside, but does have full diagnostic and programming capabilities through the vehicle Controller Area Network (CAN) C-EPT Bus.

The IDCM uses Wake-up circuits, which notifies and allows the High Voltage Modules to operate. The Hybrid Control Processor (HCP) Module, also known as the Power Inverter Module (PIM), sends a wake-up signal to all high voltage modules through the Master Wake-Up circuit. The Battery Pack Control Module (BPCM) also sends a wake-up signal to IDCM through the PIM Wake-Up circuit, which the IDCM sends to the HCP Module.



The IDCM uses the Power Electronics Cooling Loop to remove the heat it generates. The IDCM monitors its internal temperature, voltage and current flow, and if any of these items are out of range, the IDCM will not operate.

Vehicle Charging Port: The Plug-in Hybrid Electric Vehicle (PHEV) System is equipped with plug-in charging capabilities. This allows the high voltage Battery to charge when the Electric Vehicle Supply Equipment (EVSE) Charging Cable is plugged into the vehicle’s Society of Automotive Engineers (SAE) J1772 Charge Port.

The SAE J1772 Charge Port is connected to the IDCM through a dedicated 5 circuit wire harness. The SAE J1772 Charge Port supplies AC voltage to the IDCM, which converts the AC voltage to DC voltage. The IDCM supplies the DC voltage to the High Voltage Battery Pack to maintain a proper State Of Charge (SOC) for the high voltage Battery.

Low Voltage Charging: The APM part of the IDCM converts energy to the 12.0 volt system, because a Generator is not used on this vehicle. The IDCM is also used as a DC to DC convertor (300.0 volts to 12.0 volts and 12.0 volts to 300.0 volts).

For the IDCM to operate, the IDCM must detect a minimum of 10.0 volts from the 12.0 volt Battery, along with a wake up signal from the HCP Module through the EPT ECU Wake-Up Signal circuit.

High Voltage Charging: The OBCM part of the IDCM is responsible for monitoring and controlling the plug-in power supply to charge the high voltage battery. The OBCM also sends the high voltage to the Accessory Power Module (APM), which then converts the high voltage to low voltage for proper SOC of the 12 volt low voltage system.

When the EVSE Charging Cable is connected to the vehicle, the IDCM converts the incoming AC voltage to suitable DC battery voltage, then steps up the voltage level for proper charging. The IDCM regulates voltage and current flow to maintain proper State Of Charge (SOC) and State Of Health (SOH) of the high voltage Battery system.

When Monitored and Set Conditions
When Monitored:

• This diagnostic runs continuously when the ignition is on.

Set Conditions:

• When the Integrated Dual Charge Module (IDCM) detects greater than 230.0 amperes on the B(+) circuit or the internal hardware protection signal is active.

Default Actions:

• The IDCM output is deactivated.

 

[ParisJeep]

I hit this code after trying to winch out an old truck that backed itself off the road onto a steep hillside.

The code seemed to clear and go away for now after running JScan but it seems like we could all use an experts guidance on on what's wrong. Search this code in Google and there's a bunch of vague answers...

My winch (positive and negative) are wired directly to my 12V battery with an extra disconnect switch on the hot side. Nothing extra except what came with the winch. I have an E torque as well.

Is something special / different needed for the electrical so it doesn't throw codes?

I'd hate to find out that this setup is wrong / doing damage to the expensive battery or limiting winch power.

NOTE: I didn't actually get them out and was considering another attempt soon. I noticed that eventually the winch was shutting off / stopping mid pull. Is this related or am I possibly not getting full power to the winch due to a safety / kill switch?

 

[alphawolff]

I hit this code after trying to winch out an old truck that backed itself off the road onto a steep hillside.

The code seemed to clear and go away for now after running JScan but it seems like we could all use an experts guidance on on what's wrong. Search this code in Google and there's a bunch of vague answers...

My winch (positive and negative) are wired directly to my 12V battery with an extra disconnect switch on the hot side. Nothing extra except what came with the winch. I have an E torque as well.

Is something special / different needed for the electrical so it doesn't throw codes?

I'd hate to find out that this setup is wrong / doing damage to the expensive battery or limiting winch power.

NOTE: I didn't actually get them out and was considering another attempt soon. I noticed that eventually the winch was shutting off / stopping mid pull. Is this related or am I possibly not getting full power to the winch due to a safety / kill switch?

Brother, just scroll up. I posted everything you could possible want to know. Battery has loose shit somewhere around it. Go look it over.

 

[ParisJeep]

I have read through your post a few times and maybe it's still just over my head. I will go double check my electrical connections are snug but I had locked in on one particular detail:

When the Integrated Dual Charge Module (IDCM) detects greater than 230.0 amperes on the B(+) circuit

I was looking at this and thinking since my winch can pull 365 amps at max load that may be tripping this code. But shouldn't there be a way to pull max amps that doesn't throw a code, and why did this code get created in the first place? Is pulling more amps dangerous to the system or is it just uncommon and so throwing a code is an attempt at an early warning system for shorts.

If the 12v battery needs replaced there would be other symptoms appearing other than just this code right?

As far as resetting the module, that isn't something to prevent the code from happening to begin with.

I'm sure a loose connection could lead to a short that causes high amp draw, but that doesn't seem to be what is happening, because it only happened as I am winching and stationary ...

All the posts I've seen on this were preceded by winching, and the code getting thrown, probably from the high amp draw and it seems like there might be a correct way to let the winch pull more amps without the IDCM / battery system freaking out

 

[THAW]

If the 12v battery needs replaced there would be other symptoms appearing other than just this code right?

Not necessarily. Heavy winching can reveal the first signs of battery aging because it creates such a large peak and total (additional) load.

The 12V battery may not yet "need" to be replaced for starting/operating the vehicle, but the better it's condition the more power it can provide under winch load, and the lower the peak current through the IDCM.

In any case, perhaps rest the winch/battery more to help avoid the IDCM over current code.

 

[Slate]

Hey, there was another post with some additional details. A little while after this, actually two months later, I did another pull on my winch and this time I didn't "pulse" it, just a steady pull and everything was fine.

This was after a day long wheeling trip. In short, I was pulling too much power from the electrical system. The 4XE's don't have the normal alternator and, in my case, my 12V batteries, were trying to pull too much power that the HV system didn't like.

For the next couple of pulls, I did the same slow and steady pulls and didn't have a problem. I think in my original concern I was looking for some advice from a technique perspective, but as Alpha points out, loose connections will cause all kinds of issues and is easy to check/fix and I would certainly rule that out.

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