CSP 24P16 - Electrical System Drain Caused By HVAC Module, 12V Battery Test and Reset

[Mach-Lee]

On some 2023 vehicles built July 1 through September 5, the Remote Climate Control Module (RCCM) or HVAC module may stay awake after the car is turned off and cause a 12V system drain. This may set a B1616 code (Electrical System High Key Off Load) in the BCM, and a "Electrical System Drain Service Required" message on the instrument cluster or in FordPass. If not resolved, Ford says this can result in a dead 12V battery if the vehicle is parked for 10-15 days.

The official fix for this is the good ol' 12V reset procedure where the negative battery cable is removed for 5-10 minutes to reset all modules. The dealer will do this and test the 12V battery with their special tester to see if it's good (in most cases it will be). If the 12V battery fails the test, then it will be replaced. You could also try removing the negative battery cable yourself to fix the problem and save a dealer visit.

In general, if you get an "Electrical System Drain" message, I recommend you follow my full guide to resolve it since there may be other causes. The 12V drain checklist has been updated to add this cause.

Owners will not be notified of this CSP.

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[zvez]

mach-lee proving once again, he is a brilliant resource of information!!

I'm curious, for the module to get stuck on, would that mean the climate control system has to be on when the car is shut off? For instance if I pull into my garage with ac on, if I physically turn the system off will it prevent this from happening?

Interesting that it's only effective thru the bumper to bumper warranty period, not sure if I've noticed that terminology before.

 

[stevenschwartz]

On some 2023 vehicles built July 1 through September 5, the Remote Climate Control Module (RCCM) or HVAC module may stay awake after the car is turned off and cause a 12V system drain. This may set a B1616 code (Electrical System High Key Off Load) in the BCM, and a "Electrical System Drain Service Required" message on the instrument cluster or in FordPass. If not resolved, Ford says this can result in a dead 12V battery if the vehicle is parked for 10-15 days.

The official fix for this is the good ol' 12V reset procedure where the negative battery cable is removed for 5-10 minutes to reset all modules. The dealer will do this and test the 12V battery with their special tester to see if it's good (in most cases it will be). If the 12V battery fails the test, then it will be replaced. You could also try removing the negative battery cable yourself to fix the problem and save a dealer visit.

In general, if you get an "Electrical System Drain" message, I recommend you follow my full guide to resolve it since there may be other causes. The 12V drain checklist has been updated to add this cause.

Owners will not be notified of this CSP.

Question - is there ny way to tell if this is happening? I assume not - the actual AC is not left on.

Second question - easiest way to check build date.

Steve

 

[Mach-Lee]

I'm curious, for the module to get stuck on, would that mean the climate control system has to be on when the car is shut off? For instance if I pull into my garage with ac on, if I physically turn the system off will it prevent this from happening?

No. It's more complicated than that, the module can still cause a drain regardless of what you have it set to.

Question - is there ny way to tell if this is happening? I assume not - the actual AC is not left on.

Second question - easiest way to check build date.

You will get a "Electrical System Drain Service Required" message.

You can check your build month on the VIN data plate on the B pillar.

 

[stevenschwartz]

Thanks!

 

[VaporRT1]

On some 2023 vehicles built July 1 through September 5, the Remote Climate Control Module (RCCM) or HVAC module may stay awake after the car is turned off and cause a 12V system drain. This may set a B1616 code (Electrical System High Key Off Load) in the BCM, and a "Electrical System Drain Service Required" message on the instrument cluster or in FordPass. If not resolved, Ford says this can result in a dead 12V battery if the vehicle is parked for 10-15 days.

The official fix for this is the good ol' 12V reset procedure where the negative battery cable is removed for 5-10 minutes to reset all modules. The dealer will do this and test the 12V battery with their special tester to see if it's good (in most cases it will be). If the 12V battery fails the test, then it will be replaced. You could also try removing the negative battery cable yourself to fix the problem and save a dealer visit.

In general, if you get an "Electrical System Drain" message, I recommend you follow my full guide to resolve it since there may be other causes. The 12V drain checklist has been updated to add this cause.

Owners will not be notified of this CSP.

So no actual software update or fix to correct this? If this is a defined issue for cars built withn a specific period, it will keep occuring over time. Really hard to believe this is the actual band aid resolution offered

 

[Mach-Lee]

So no actual software update or fix to correct this? If this is a defined issue for cars built withn a specific period, it will keep occuring over time. Really hard to believe this is the actual band aid resolution offered

It’s just like a computer, sometimes rebooting is the only way to fix a problem. After that it should be fine. If an OTA would have resolved it, then they would have done that instead.

 

[ThunderClap]

Owners will not be notified of this CSP.

So how do we know if we are affected?
I got my car like 2.5 months ago. And got this 12v battery thing today. How to get checked for this CsP?

 

[Mach-Lee]

So how do we know if we are affected?
I got my car like 2.5 months ago. And got this 12v battery thing today. How to get checked for this CsP?

Your build date is May 2023, so not affected. Follow the steps in my 12V drain topic instead to chase it down. Although it won't hurt to do a 12V disconnect anyway if you're handy.

 

[ThunderClap]

Your build date is May 2023, so not affected. Follow the steps in my 12V drain topic instead to chase it down. Although it won't hurt to do a 12V disconnect anyway if you're handy.

Thanks Lee,
But how do we check the build date amd current 12v soc

 

[Mach-Lee]

Thanks Lee,
But how do we check the build date amd current 12v soc

Build month is on your B-pillar VIN data plate sticker. For exact day you need someone like me in the update topic to look up.

You can check your 12V % status here at the Ford Account Dashboard (temporary website error is showing 12V SoC instead of HVB SoC). Canadians change .com to .ca in the URL. The charge level shown is actually the 12V SoC (should show 83% now in your case).

 

[MotownMachdoc]

Just had my car in to have the battery drain checked. If agm battery is drained deep it kills it. The csp checks the battery and if it’s toast, that needs to be replaced along with the reset. Agm batteries can be killed if the charging does not keep up with the drain. If you disconnect the negative on a dying battery that won’t resolve the issue. With my car,
RECALL. ACCESSED

AND TESTED 12V BATTERY USING DCA-8000P TESTER. BATTERY FAILED TEST. REPLACED BATTERY AND PERFORMED BMS RESET.

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