2019 F250 6.7 I'm swapping out the OEM batteries with AGM batteries. Is it a clean swap or do I need to reprogram something in the truck?

 

I didn't have to reprogram anything when I did my swap on my '17 .

 

I have read on here something about leaving the truck sit for at least 8 hours after the AGM swap. No unlocking, opening doors, nothing. I'm not sure what that does, or what happens if not done.

 

In forscan there is a setting for AGM but not necessary to perform. I believe if you do one battery at a time, there is constant power, no interuptions

 

There’s all kinds of crap you can read on here.

 

You’re not going to be swapping both batteries out simultaneously so you’re not going to lose total power to the truck .

Replace one at a time and move on.

 

I just did mine on the 2020. Only 5k miles and the signs of off gassing from the OEM ones. Direct swap. I did use Forscan and change battery composition to AGM.
i swapped one battery out at a time. Teuck started right up like nothing happened

 

Except what he posted actually is a Ford service procedure. It's the way to reset the BMS parameters with the exception of the battery days in service. That requires a BMS reset with IDS or Forscan.

This vehicle is equipped with load shed strategy. The Body Control Module (BCM) monitors the battery state of charge using the battery current sensor
attached to the negative battery cable and the battery open circuit voltage as measured by the BCM during 8 continuous hours of vehicle sleep time (ignition off with doors closed).

With the engine off and the ignition in the ACC, RUN or delayed accessory position, when the BCM determines the battery state of charge is low, a message is sent to shut down the audio/navigation system in order to save the remaining battery charge. Under this condition:

• the Front Display Interface Module (FDIM) displays SYS OFF TO SAVE BATT (without navigation) or BATTERY SAVER — SYSTEM OFF
PLEASE START THE ENGINE (with navigation).
• the Instrument Panel Cluster (IPC) message center may also display TURN POWER OFF TO SAVE BATT (base message center) or TURN POWER
OFF TO SAVE BATTERY (optional message center) to notify the driver that battery protection actions are active.
• the battery indicator may also illuminate.
If the vehicle battery has been charged or battery replaced, it takes approximately 8 hours for the BCM to learn the new battery state of charge. During this 8 hour period, the vehicle must be undisturbed, with no doors opened or keyless entry buttons pressed. If the vehicle is used before the BCM is allowed to learn the new battery state of charge, engine off load shedding may occur earlier than normal and a message may be displayed.
If the vehicle has been jump started, engine off load shedding can still occur and a message may be displayed until the BCM determines the battery state
of charge is above 40%.

With the engine running, when the BCM and Power Steering Control Module (PSCM) voltage is low, a message is sent from the BCM to either minimize or
shut down the climate controlled seats, rear defrost, heated mirrors and Dual Automatic Temperature Control (DATC) blower motor to improve system
voltage. Under this condition, the IPC message center displays either LOW BATTERY LESS FEATURES (base message center) or LOW BATTERY
FEATURES TEMPORARILY TURNED OFF (optional message center) to notify the driver that battery protection actions are active.

 

I replaced one at a time and then the truck sat for 12+ hours. Do I need to do a BMS reset with Forscan? I was planning to make the AGM change with Forscan like mentioned above.

 

The BMS module reset will reset the battery age to zero. Might as well do it while you are there.

 

Thanks for the correction. It sounded like BS to me and unlikely for most people since most would replace the batteries and immediately drive from the shop/parts store. In that case, I suppose the BMS resets eventually, whenever it does get 8 hours.

 

I don't have a 2020 & up wiring manual so I can't speak to those trucks but 2017 - 2019 Super Duty trucks, from the F-250 to the F-550, do not have a BMS system. Swap them out and you're good to go.

If you have this sensor on both of either the battery negative or positive cables then your truck is equipped with a BMS. For 2011 - 2021 the F-150 has them on the negative cable. It appears they may have them on the positive cables too, according to the parts description. However, I've never seen anyone post in the F-150 forum about them being on the positive cable on any truck. Some of the guys that also own Mustangs stated they were on the positive cable in the car. Plenty of guys there unplug them so the charging is handled by the voltage regulator and alternator like the old-school method. Seems to work fine for those who post about it.




This is it on a 2013 era F-150:



This is it on a 2016 F-150:


Furthermore, there isn't a spot in Forscan to identify and control the charging of dual batteries. Because the batteries are wired in parallel the truck "sees" both batteries as one and does not know the state of them individually. For that matter, if you have dual alternators the 2nd alternator sits largely idle as the truck only turns it on when the primary alternator is taxed to a pre-determined threshold. Ford should have done something to identify the separate batteries from a state of charge point of view, like the sense systems used for charging RC model batteries and the batteries in electric / hybrid cars. With the batteries in parallel if one begins to have issues and causes the charging system to charge at higher rates / voltages it will have a detrimental effect on the 2nd battery. That is why you see so many posts correctly stating to replace the batteries in pairs so you don't pair a new battery with an older one that has issues or has less capacity because of age and use.

 

The BMS is not the same as the vehicles under 8500GVW that are subject to CAFE restrictions. These trucks do have BMS and it is not talked about in the manual because it is not a repair as it's all software based and done through the BCM.

The BMS system is different then the F-150 and other vehicles as these trucks are not subject to CAFE restrictions. The BMS is shown on the forscan spreadsheet.

726-03-01 x*xx
726-03-01 x*xx
BMS 01 - BodyManufacMode_Cfg ENUM: 0=BUILD 1=NORM 2=TRANSPORT
23
726-04-01 x*xx xxxx xxxx
Battery_Cfg ENUM: 0=FLD 1=AGM
24
726-04-01 xxxx x*xx xxxx
BatteryTypeFactory_Cfg unsigned Undefined / Not Used
25
726-04-01 xxxx xxx* xxxx
BatteryTypeNormal_Cfg unsigned Undefined / Not Used
26
726-04-01 xxxx xxxx x*xx
BattWCCDurationCrank_Enable_Cfg ENUM: 0=FALSE 1=TRUE
27
726-04-02 x*xx xxxx xxxx
BMSInCar_Cfg ENUM: 0=Undefined / Not Used 1=LIN 2=PWM
28
726-04-02 xxx* xxxx xxxx
BMSTransportSleep_Cfg ENUM: 0=DISABLE
BMS 01 - BodyManufacMode_Cfg ENUM: 0=BUILD 1=NORM 2=TRANSPORT 23 726-04-01 x*xx xxxx xxxx Battery_Cfg ENUM: 0=FLD 1=AGM 24 726-04-01 xxxx x*xx xxxx BatteryTypeFactory_Cfg unsigned Undefined / Not Used 25 726-04-01 xxxx xxx* xxxx BatteryTypeNormal_Cfg unsigned Undefined / Not Used 26 726-04-01 xxxx xxxx x*xx BattWCCDurationCrank_Enable_Cfg ENUM: 0=FALSE 1=TRUE 27 726-04-02 x*xx xxxx xxxx BMSInCar_Cfg ENUM: 0=Undefined / Not Used 1=LIN 2=PWM 28 726-04-02 xxx* xxxx xxxx BMSTransportSleep_Cfg ENUM: 0=DISABLE

 

So….. can I install AGMs on my ‘22 if I do them one at a time without worry? I don’t need the technical explanation. The regular batteries corroded bad on my 2018.

 

Great thread! Thank you to all that contributed helpful information.

Does anyone know what changes when AGM is selected in Forscan rather than FLD?

Maybe the “charge to” voltage? Idk