Error code U0121
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Joined: Nov 2009
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Error code U0121
Any Ideas ? I have idiot lights ABS and Brake on, no speedo, no cruise, no odo.
I got it after pulling all the fuses in the fuse box and reinserting them after they all looked ok.
This was done to try figure out why pin 5 on the trailer plug was not working. and it still dose'nt...
I got it after pulling all the fuses in the fuse box and reinserting them after they all looked ok.
This was done to try figure out why pin 5 on the trailer plug was not working. and it still dose'nt...
Registered User
Joined: Apr 2007
Posts: 217
Likes: 0
From: South Alabama
I posted the code in your other thread.
You sure you didn't pop that fuse when you plugged it back in? or plugged it into the wrong space?
U0121 Lost Communication With Anti-lock Brake Module
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6.7L MegaCab
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Dec 14, 2022 06:37 PM