Ford Forums banner

2007 Expedition - 5.4L - CEL - U0121

2K views 1 reply 2 participants last post by  CatSkinner 
#1 ·
So after completely rebuilding the head on my 2007 Expedition I got a ABS/Brake light that came on. I pulled the code and it was U0121 - Lost Communication With Anti-Lock Brake System (ABS) Control Module

Prior to rebuilding the head everything was working fine with the ABS so it cant be a bad sensor on the wheel or anything so I am thinking it could possibly be a bad ground. I did after all have to remove like 4 ground wires when I had to pull off the head.

Does anyone know which ground wires are for the ABS control module so I can check it? Also, if it isn't a ground issue... what other things should I be looking at.?

Thanks!!
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top