Recent content by Aaron407

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    Alternator Wiring Diagram/Wire Colors?

    The problem ended up being a corroded/broken voltage reference wire a few inches away from the alternator.
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    Determining Which Parking Sensor is Bad

    We seem to have a bad rear parking sensor in our 2015 that pops up as a warning every time we put it in reverse. Can anyone tell me if there's a way to confirm exactly which sensor is the problem without a code reader able to tap into the BCM? I've tried using a cell phone mic to pick up the...
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    Ground Points/Strap Locations

    Can anyone tell me where the primary chassis ground points are on a 2015? I've been having some charging issues and I'm hoping to confirm that all of the ground connections and straps are in good condition. Thanks!
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    Alternator Wiring Diagram/Wire Colors?

    Hey everyone! My 2015 recently started kicking out a 'check charging system' warning. I checked the voltage while it was running and it showed ~14.5V, so I figured the alternator was good and the original battery just needed to be replaced (which obviously put in its time). A new battery didn't...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Final follow-up: we took it into a shop and they found the CV-type joint on the front driveshaft was broken. They replaced the driveshaft and the noise is gone.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    4A is fine to use basically all the time since it just adds spinning weight of the axles with the IWEs locked but nothing is actually being powered unless there's a loss of traction since the clutch isn't normally being applied in the transfer case. Per the manual regarding 4A: "This mode is...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    New updates in my hopes of figuring this out: I replaced the hub/bearing and IWE. Everything's back together and functioning, but the sound is still there. I also noticed that abruptly pulling off the throttle when at highway speed will usually see the sound briefly go away completely. I'm...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Latest update: I just tested both front IWEs under vacuum. They both held 16" with no issues, including when rotating the wheels. I also tested vacuum level from the system at each IWE, which came in at 26". There was no variation when cranking the wheel either. Since everything seems to be...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    I wouldn't be as concerned if it had always done this, but it was fine for the previous 155,000 miles and just started making the louder noise.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Yeah, I plan on jacking it back up and putting my hand vacuum pump on, then rotating the hub to see if it still holds vacuum properly in case the seal is bad. The lack of vacuum switching from 4wd to 2wd at full left lock is a weird thing, though. I haven't found anything online that says it...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Thanks, I'll take a look. Considering that it can be in a spot where it's "happy", or at least not making the humming noise, it really seems like a vacuum issue.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    New check valve made no difference, unfortunately.
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Update: Now the humming is still there in both modes, but the tone drops slightly when I switch from 4A to 4x2. When I switch from 4x2 to 4A at speed, the humming sound briefly goes away completely, then comes back. I discovered that if I stop and turn the steering wheel full left (haven't...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    Normally I would think wheel bearing when there's humming, except that it goes away in 2WD and it doesn't really vary in tone depending on speed. It's a bit more 'rough' of a sound than a consistent hum as well. When I was thinking about the IWE, I was wondering about the possibility of it not...
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    2015 Ecoboost - Humming from Front Driver Side Wheel in 4A

    I noticed on the weekend that our 2015 Navigator (same engine/drivetrain as an Expedition but a heftier price tag) had a subtle but more noticeable humming noise specifically from the front driver side wheel area when driving at highway speeds in 4A. The sound goes away completely after...
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