[jimshoe]

Is the hood steel or alum on a 2017 pacifica?

 

[JPhi]

Took a magnet outside...

Steel (magnet stuck):
Front fenders, front doors, main body

Aluminum (magnet did not stick):
Hood, rear doors, lift gate (magnet felt steel bracing in all the doors).

Plastic:
Front and rear bumpers, pretty sure the side skirts, that black triangle above the brake light, mirrors

Also of note, the wheel wells and almost the entire underside of the vehicle are lined with a fibrous mat material. My neighbor's newish Chevy Truck has the same wheel well linings. It was a surprise to me, but I guess it's pretty common now.

 

[JPhi]

Also found this useful article when researching something else. The rear liftgate is quite a weight saving part using magnesium and aluminum.

Casting of the Year: Magnesium Liftgate Cuts Weight, Adds Value | Modern Casting | AFS

Also:
http://www.meridian-mag.com/@assets/uploads/news-2/ruliftgate.pdf