Maybe you already checked this but is your pitman arm tight? Hopefully you figure this issue out man.

 

i am really starting to think it may be one of the modules doing something with the steering.
I am wondering if this truck does have that EPAS system??
Sometimes the truck pulls, sometimes it drives straight as an arrow. Times when I think it would pull worse due to the road, it drives straight or drifts to the right.
I have checked, double checked, triple checked everything mechanical. everything looks good to me.

I have been trying to find out what modules Ford says need to be recalibrated after an alignment, but have been unsuccessful. Anybody know off hand?
And can any of them be reset with Forscan?

 

We know that your truck has the electronic assisted steering, it comes standard on 2020+, XLT and up. It is however different than the EPAS on the F-150. The F-150 EPAS system does not use hydraulic assist, only electronic. The Super Duty still uses a combo of both hydraulic and electronic, with the electronic assist being supplemental under certain driving conditions.

It could be the effects of that system that are creating the issue you're observing. I don't know if it can be reset, and I have never heard of anything on these trucks requiring a reset after alignment. Can you post up where that info comes from?

 

EPAS is a self contained rack and pinion. It uses sensors embedded in the input shaft housing to determine steering wheel angle, and is motorized for lane keep assist as well as self parking and trailer back up assist. The SD steering still uses a standard steering gear box powered by hydraulic fluid that also powers the brakes. The trims that have trailer backup assist are the only ones with a motor to power the steering shaft. The adaptive steering uses gear reduction, not sure how it functions, but is speed sensitive in that anything over a few MPH it does not engage and should have zero impact on how the truck steers.

Lane Keep is camera based on the SD and alerts via dash, but also vibrates the steering wheel, at least what I read it does, but has no other function like EPAS does where it will auto correct and pull you back into the lane. EPAS also has Pull Drift Compensation where it wil sense when the crown causes excess pull, or a strong cross wind and apply a bit of motor force to ease up the amount the driver needs to counter the pull or drift. I looked but did not see any mention of that being carried over to the SD, but if it did have it, the only thing that could apply it would be the trailer backup assist motor on the steering column.

Not saying that it is the TBA, but you never know. One way to find out is find the fuse that powers it and disable it.

 

Take a look at post #59. The electronic steering motor comes standard on XLT and up, even without the PTBA option. Also, some of what you described with the F-150 EPAS, like road crown and wind compensation, is similarly described for the Super Duty system.

 

I don't specifically recall where I saw the various sensors need recalibration after alignment. It may have been a few different places.
I ran Forscan yesterday. No DTCs or faults in any modules.
I reset the SECM (steering effort control module) and the SAS (steering angle sensor) modules just for the heck of it. Don't know if it did anything, probably not. I did not see a specific module for the trailer back-up assist. It must run through some other one.

 

Currently I am fighting a wandering issue on my 2022 F250 since Feb. I have tried adding more caster with radius arms. Adjusted toe. Tire pressure...... Yesterday I took the fuse out for the EPAS. I will drive it for a few days and report back. Early indication is either the hardware is faulty or control module is bad or faulty software. It did throw several codes, hill desent, adaptive cruise, On the way to work the truck tracked straight with little to no correction from me.

 

Which fuse is for the EPAS? I didn't see that listed. I did pull some fuses trying to isolate the trailer back-up assist and things that are for the steering. I don't recall the names off hand, but do remember the fuse locations 🤦🏼. one was #17 on the interior passenger kick panel and the other was #9 in the engine bay fuse panel.

Both threw codes and lit up the gauge cluster like a christmas tree.

I would be interested in testing on my truck
thanks

 

Was looking at parts diagrams. This is called the:

Hydraulic Steering Actuator Module

 

it was #9 in the engine bay. FYI, Getting the fuse cover out of the way was tight

 

thanks
yep, i was thinking to myself as i was taking the fuse box cover off, what a stupid location

 

I knew it had module in the name haha, couldn't remember the exact name that Ford called it. That part is the motor for what is being called "EPAS" here. I've heard it referred to as electronic overlay steering, electro hydraulic steering, and in another thread a dealer referred to the part as the electronic steering module.

When you disable it by pulling the fuse (if that works), post up the results.

 

UPDATE:

I just got done testing.

as we have figured out, my truck does have a version of EPAS. It appears certain SD trucks with certain options come with EPAS.
The steering shaft goes through the motor, and the motor is attached to the driver side frame rail (the big aluminum bracket)

So, just like jdgreg5 posted, he had improved steering with pulling the EPAS module fuse, I figured I would try the same. However, instead of pulling the module fuse, I took it a step further and pulled the actual motor fuse (#29, 40a) in the under hood fuse panel.
As expected, the truck did not like it. I had all kinds of faults and features disabled. The steering was quite stiff as well. I drove it. Immediately upon driving, I noticed the left pull was gone. The truck drove straight and only changed directions due to the road imperfections, crown, etc...
So this tells me the EPAS system is trying to compensate/over compensate for the road crown, etc...

When I got home, I replaced the 40a fuse and decided to drive again. No lights or warnings upon start up. Immediately the steering effort was easy, back to normal. I was fully expecting the pull to be back. However, the pull is not there!!???! The pull is significantly noticeable on my street, but not now. I drove the same route as when the fuse was pulled, streets that the truck always pulled on, etc... The truck is driving perfectly straight!!!

so, i have proved to myself that something with trucks steering electronics was causing the pull. pulling the EPAS fuse for about 20 minutes must have reset something???? I don't really get it or understand...

thoughts?

 

Glad you got it figured out, that's my only thought. I was feeling your frustration.

 

It sounds like it recalibrated itself. Good find and I hope it lasts.