Code U0121 ? Lost comm with abs module
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Junior User
Joined: Jun 2013
Posts: 61
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From: Southern Ontario
Code U0121 ? Lost comm with abs module
Any ideas where to start? Yesterday driving in the rain the truck started flashing "service advance track and check brakes" on the message center then put this code up a few minutes later? Today CEL is off but the message screen is going crazy flashing these messages?? I will call and book an appointment with the dealer tomorrow as it is still under warranty but was curious if any of you had an idea what went for a crapper?
Elder User
Joined: Aug 2007
Posts: 914
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From: Saskatoon, SK, CA
First thing I would check to see if you blew the fuse for that component under the hood. If you had a lot of rain it may have shorted something. Fuse may be gone but there also may be an underlying cause to it like a bare wire that shorted or connection that got water in it and shorted somewhere on the frame. I got that message when I borrowed a fuse from the box under the hood to replace one for something else - didn't have a spare fuse with me and needed to borrow it temporarily. Get out your owner's manual to see the fuse diagrams.
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Junior User
Joined: Jun 2013
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From: Southern Ontario
An update to my problem: the truck spent two days at the dealer this past week and the tech found a wire in the abs harness that had rubbed through behind the drivers inner fender. All good now, just hope it doesn't happen again!!
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Elder User
Joined: Aug 2007
Posts: 914
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From: Saskatoon, SK, CA
Thanks for the update. I think I heard that one other time on here in the past. It's rare but I guess it happens. Good to know in case others have a similar issue.
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Junior User
Joined: Jun 2013
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From: Southern Ontario
I agree, that is why I had the tech show me where it was worn through. It looks like there is a chance of it happening depending on how or who ties the harness up at the factory.
Official Ford Rep
Joined: Jul 2013
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Yesterday driving in the rain the truck started flashing "service advance track and check brakes" on the message center then put this code up a few minutes later? Today CEL is off but the message screen is going crazy. I will call and book an appointment with the dealer tomorrow ?
This is Kwasi. Have you been able to take your truck to your dealer as planned? I would like to look into your concern and see what I can do to assist. To proceed, please share current status including year and odometer reading
Kwasi
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Junior User
Joined: Jun 2013
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From: Southern Ontario
Kwasi, thanks for the reply! The vehicle is working fine again. It is a 2012 F250 SD with 56,000 km. on the odometer. I have purchased the ESP plan to ensure coverage for some time yet.
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