Total Meltdown - Help! - 2022 Expedition Max Limited

no MORE_MPG

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Hello mdexp.
I'll share a story that may or may not be relevant.
Upon returning from a week of business travel, I found that I was not able to unlock my vehicle (not a Ford) with the keyfob. There was no sign of anything electrical going on at all. I had locked the physical key inside the vehicle (feel free to knock me for this). So, after calling for a back-up physical key, I opened the door and noted that the LCD odometer was blank.
I opened the hood, visually inspected the battery connections, which all looked normal. Upon touching the connections (not disconnecting, just touching), everything came to life and worked perfectly. The battery was fully charged.

The only conclusion that I could come to was that while the cables were connected physically, they were not connected electrically. There must have been some corrosion occur between the post and clamp.

In your case, there may have been a poor connection to the battery which confused the regulator causing it to tell the alternator to over-produce current (or maybe voltage). This is at least partially negated by the fact that it apparently started without issue using remote-start.

Best of luck getting this issue resolved! (or having it never happening again)

Ben
 
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mdexp

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When I used to work on Lexus vehicles at the dealership, we would occasionally get issues almost exactly like this. It was just about always the Amplifier for the sound system. We would replace them and it would be all good. Good luck.
That's great - with 2 replies pointing potentially to the amplifier it sounds promising. Appreciate it!
 
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mdexp

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I'll keep this updated in case anyone else has the same issue at some point... although not much of an update to give. I had it in the dealership today- they ran the normal scans and tried to reproduce the issue, but not surprisingly, were not able to find anything. I mentioned the amplifier as a potential culprit and also the sync3 test mode. He did not think it was a test mode because he indicated that normally moves from speaker to speaker. He did think the amplifier could potentially be involved, but couldn't find anything not functioning correctly.

If it happens again or I have any more info I'll update this thread.
 

Rob6805

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When it happened was the vehicle powered on? Either running or in aux mode?
 
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mdexp

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When it happened was the vehicle powered on? Either running or in aux mode?
I had remote started the vehicle, got inside, and powered on fully (pressed brake/hit start button) - it began making the noise immediately after I started the car.
 

Rob6805

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I had remote started the vehicle, got inside, and powered on fully (pressed brake/hit start button) - it began making the noise immediately after I started the car.
And the sound was coming from the speakers? All of them? You have B&O audio, right?
 

NC12South

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I know this is not helpful, but my first thought was are you friends with James May or Jeremy Clarkson?
Will give you one more thought, if you are having any other electrical issues, have them check the harness below the battery. Mine had been stored somewhere before delivery where mice made just enough damage to create intermittent issues. Just a thought.
 
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mdexp

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And the sound was coming from the speakers? All of them? You have B&O audio, right?
The sound was coming from all speakers (the best I could tell- honestly it was so loud it was a bit hard to decipher). I do have the B&O sound system.

I know this is not helpful, but my first thought was are you friends with James May or Jeremy Clarkson?
Will give you one more thought, if you are having any other electrical issues, have them check the harness below the battery. Mine had been stored somewhere before delivery where mice made just enough damage to create intermittent issues. Just a thought.
Another good suggestion- I'll try to check this out to see if there could be any damage.
 

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