WAIT on Hybrid Battery drain update

[Darryl]

First rule in computer software updates, there's always another bug.

It is especially frustrating that the bug results in us not being able to either program the new update nor return it back to the old update nor install a new part and identify with the vehicle. Even more so given the fact that they have been working on this issue for months and months.

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[Darryl]

Aye, my bad I thought it was. I am in no hurry to let Ford dick with my 2025 Lariat that is working just fine.

If any of them are working just fine, I wouldn't mess with them since the purpose of the update is to fix an existing problem that only some vehicles have. If it becomes a recall, I would advise having it done because sometimes them honoring a warranty, especially if they extend the warranty is contingent on having a recall done. But at this time, don't worry about it. I know I won't. There are some updates that I would do on my own vehicle whether it's showing the symptom or not. But at this time, this is not one of them

 

[HeyBales]

Could be as simple as different ACCM's started with different version, but the recoding didn't check them all.

I wish Forscan Lite would let me read the module version numbers, or at least haven't found them yet.

All I can find is like this under Vehicle Info:
ACCM - Air Conditioning Control Module
Bus: HSCAN
Part number: NZ1H-19F611-AF
Calibration level: NZ1H-19F611-AF
Strategy : NZ1H-14D491-AF

 

[RobN]

First rule in computer software updates, there's always another bug.

99 reports of bugs on the wall,
99 reports of bugs
Take one down, patch it all up,
104 reports of bugs on the wall!

 

[CD_SM]

If any of them are working just fine, I wouldn't mess with them since the purpose of the update is to fix an existing problem that only some vehicles have. If it becomes a recall, I would advise having it done because sometimes them honoring a warranty, especially if they extend the warranty is contingent on having a recall done. But at this time, don't worry about it. I know I won't. There are some updates that I would do on my own vehicle whether it's showing the symptom or not. But at this time, this is not one of them

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?

 

[HeyBales]

@XLTLUXRED

This is the likely reason for your fast drains to the battery.
Or another module causing a parasitic draw.

Not the slow death most of us encounter due to bad charging strategy with an expected amount of minuscule draw.

Question in post right above for ya.

 

[HeyBales]

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?

And then there are the cases like today for me - raining.
AC was being run automatically from time to time. But not the defrost vents strangely.

Anyway, I almost always turn fan down to 1 and usually turn off AC before I turn off truck, but I don't turn off climate control.

So if it happened to be on auto-AC at that moment, and I turned it off...

Trying to recall all the complaint posts about AC being run automatically without it being turned on, but can't recall if climate was on or off for them.
If run even while climate is off - then we all have the possibility to have AC running when we turn truck off.

Now I'm starting to wonder if the scanner reading of error in ACCM communicating with the ECM was on last turn off, or on startup.
If on last turnoff, and it was trying to say stop the fan to the ECM but couldn't, that's not good.

 

[XLTLUXRED]

@XLTLUXRED

This is the likely reason for your fast drains to the battery.
Or another module causing a parasitic draw.

Not the slow death most of us encounter due to bad charging strategy with an expected amount of minuscule draw.

Question in post right above for ya.

We have had the AC on about half the time and just turn it on or off as it is needed. I never think of turning it off before turning off the truck. The interesting thing is that after two months of near daily battery drain (and the Ford shop saying there was nothing they could do yet but would call us as soon as the fix was developed), our truck stopped having the battery drain altogether...! It's been a good 5 weeks with no issues. And (is anyone surprised) the shop has not called us to tell us they now have a fix.

 

[Maltoftheearth]

I’m living this hell currently. My truck has been in the shop for 2 weeks (still under warranty). At what point do I invoke the lemon laws? I’m going to have ZERO confidence in this thing when (or if) it comes back.

Darryl - thank you SO much for this post, and if you have the problem, you would be wise to heed his advice.

 

[Darryl]

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?
[/QUOTE I

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?

The truth of the matter is that the vast majority DO NOT exhibit a problem. Most people do not shut off their air conditioning or any other accessories when shutting their vehicles off. Yet the problem only manifests itself in a relatively some vehicles. This seems to be true with most issues that are addressed by updates. A customer may have 2 identical vehicles. One may manifest the problem and require an update. The other may not. I can't explain why or why not. But that's what I've observed in my years as a tech.

 

[A Sturdy Beast]

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?

My ‘23 has the battery saver problem. It started after about three months after taking delivery. I always turn everything off including heat and air before turning the vehicle off.

I put in a Die Hard Gold in the Fall of ‘23 and three months later it’s back to no dome lights and the power points die as soon as key is off and driver’s door is opened. I put in an AGM battery a month ago and of course it is working fine for now.

I have never paired my phone or installed the Ford Pass app. Modem fuse is pulled.

 

[CD_SM]

My ‘23 has the battery saver problem. It started after about three months after taking delivery. I always turn everything off including heat and air before turning the vehicle off.

I put in a Die Hard Gold in the Fall of ‘23 and three months later it’s back to no dome lights and the power points die as soon as key is off and driver’s door is opened. I put in an AGM battery a month ago and of course it is working fine for now.

I have never paired my phone or installed the Ford Pass app. Modem fuse is pulled.

Ok, that answers that! Guess my theory doesn't hold water.
Sure hope the update fixes yours.

 

[A Sturdy Beast]

Ok, that answers that! Guess my theory doesn't hold water.
Sure hope the update fixes yours.

It was a reasonable suspicion. I’ll probably wait to update until they fix the fix.
[edit typo]

 

[HeyBales]

Ok, that answers that! Guess my theory doesn't hold water.
Sure hope the update fixes yours.

With the auto-ac that can occur in high humidity - I think the cup is still half full.

Hard to find those threads about "why is my ac running" where a comment is made if climate control is on or off.

 

[SFBay]

Definitely agree on waiting.
But my theory is they all have the bug, but not everyone is affected. It may depend on how they use the AC. I reflexively turn off everything when I turn off a vehicle, including the HVAC. My wife doesn't turn things off ever and *always* uses AC, and both times mine went to deep sleep was after she drove it. As a software guy, I can easily imagine a bug in the AC software (and it's all software!) that continues running something if it's not off before the vehicle is. Maybe even just on a very specific setting. Might wxplain why it was hard to find...
So, out of curiosity, has anyone who reflexively turns off the HVAC had the problem? Or has anyone who always leaves it on *not* had it?

i usually only run the fans without A/C but i always turn off the hvac before turning off the vehicle. no battery drain problems over here

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