Glow plug and ABS codes simultaneously

[Don't know]

Hi everyone
Wasn't sure where to post this, and took a while to figure out how to post. My truck suddenly had the engine light on and tested for these codes all at the same time.
C0550
U0140
U0100
P0674
What might've happened, and why. I'm sure I can do the glow plug, are these all related somehow. Can I fix the other things myself. Thanks for any help anyone can offer

 

[Don't know]

Is it ABS at all? That's what I was told

 

[clrussell]

The u codes are communication codes. Glow plug number 4 on the po674..

C0550 is abs.. I'll try to look up tomorrow

 

[Don't know]

Please and thank you. Ever since I did the leveler kit it does seem to drop extremely hard on the front end from cracks in the road to speed bumps. Maybe this jarred something loose? Is one causing the other?

 

[Don't know]

I changed the glow plug today which did test bad. Had the codes cleared. Just wait and see I guess.