Help- NO STEERING!

[Blwnsmoke]

Well, sounds like whoever was the Tech didn't go through the entire script of the Ford Shop manual "diagnosis ifs, no/yes, then go tos"....

The S550 has a very well known common occurrence for AdvanceTrac errors that are caused by (3) possibilities:

- Blown or loose AdvanceTrac fuse. Go to this thread, first post - and take note it was for a 2015. If that isn't the fuse location in your S550, then go to Google and type in your year/make/model and the words "fuse diagram" and you will get the info...
https://www.mustang6g.com/forums/th...for-advance-track-and-traction-control.82309/

- Rear Wheel Thrust washer damage or failure of part. Again, this is a very common and well documented issue with the S550's where if that part is bad on either axle it will throw an AdvanceTrac error.
https://www.mustang6g.com/forums/threads/clunk-when-taking-off.83492/page-2#post-3183924

- The small harness at the air box which may also be an issue if it has become disconnected or wobbled loose will also throw an AdvanceTrac error... part is pictured in THIS thread:
https://www.mustang6g.com/forums/threads/traction-control-fuse.109035/

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I initially posted the EPAS/PSCM info because you're saying you're loosing power steering capabilities, but have an "AdvancTrac" error... My initial thought is EPAS/PSCM for sure, BUT I've never seen the AdvanceTrac error with that type of fault.

So I'm throwing the above AdvanceTrac possibilities out there now IF the issue is not directly associated with the EPAS/PSCM - but is somehow causing a secondary failure of the steering - which again is odd that it would....

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Let us know how you make out and what they find. Did the Tech even do the wiggle test of the EPAS harness or see there are any loose ground wires in the engine bay? Did he check for any rodent damage, because rodents love chewing up vehicle harnesses....

I can tell you when my EPAS went out on my explorer, I got the advance track warning.. so it is possible.

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[SH!FT]

The only time I had this issue, was because I mounted a catch-can on the passenger side where the ground cable is. It was loose and caused all the faults you listed and the steering wheel was basically unusable. Once I tightened everything up, it resolved and never had the issue again. Don't ask me why that causes that, but check the cable, and maybe it'll be a simple fix.

Just wanted to say thank you for sharing! I was about to fall down a troubleshooting rabbit hole.

Steering assist, advanced trac, and drive mode faults popped up after I replaced the knock sensor harness (mouse chewed it) and installed adjustable motor mounts.

I can confirm that poor grounding at this point will cause these faults. Thanks again!