Wife has a 2020 Ford Expedition with power running boards. We have had the car for a few years but recently the passenger side won't go up sometimes. It happens in phases where it works but then doesn't for awhile. Any ideas what may be causing that? I have tried oiling the hinge points but didn't seem to make much difference. Thanks in advance!

Same problem. Soak in pb blaster in all the hinge points. Rinse it off, then hit it with wd40. Repeat if necessary. Use your foot to "help" it up the first few times to get the pb blaster worked in.

My first thought was electrical because it works sometimes and not others.

We had the same issue - very inconsistent and hard to replicate for the dealer to do anything about. We finally were able to get it to replicate and the dealer replaced the motor and wiring assembly.

I'd try the lubrication, but I'd also check any connectors, and clean them, maybe apply dialectic grease

Just started having the exact same issue with my wifes 2018 Expedition. Very intermittent and hard to replicate. I'll try lubricating it.

Make sure they're clean and the undercarriage is clean too. My truck does this but only when I have caliche or mud on them and it doesn't take a bunch debris to cause this.

Why I never would get them. The underbody of a vehicle is a filthy grimy gritty place and also the most likely place to take damage from road objects or hanging a curb or whatever. It just seemed like they'd for sure break or fail more than be useful. I imagine they need regular cleaning and greasing.

They are definitely not designed for anything that gets off the road. Gravel roads are not their friend and why after 2 shops cleaned up/lubed/inspected them and countless whacks with a hammer out of aggravation I finally took them off a GMC P/U. Annoying as all hell.