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James, Ford Technician
Category: Ford
Satisfied Customers: 3630
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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E 250: Airbag light is on code U0121 is coming up at parts

Customer Question

Airbag light is on code U0121 is coming up at parts store (lost communication with ABS Control Module). What needs to happen to get this airbag light off?
Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.
Hello, were any parts replaced.
Customer: replied 1 year ago.


Expert:  James replied 1 year ago.
is this code stored into the air bag module?
Customer: replied 1 year ago.
I suppose that's how they got the code
Expert:  James replied 1 year ago.
It isn't giving me that as an code for this vehicle. I am going to check one more spot.
Customer: replied 1 year ago.


Expert:  James replied 1 year ago.
The only U0121 code I can find is communication loss with the ABS module.
Customer: replied 1 year ago.

ok, isn't that what we are looking for?

Expert:  James replied 1 year ago.
I got it airbag light threw me off. If that is the only code present you replace the abs module to correct the concern. The abs module will need to be programmed to the vehicle to ensure proper operation.
Customer: replied 1 year ago.

So i have to replace this for sure to correct this problem? If so, can you give me a link that has the part that i need for my truck? thanks

Expert:  James replied 1 year ago.
The workshop manual states to replace and reprogram the ABS module to correct this concern. It states is the ABS module doesn't correct the concern then to replace the Instrument Cluster. That is the writing straight from Ford.
Expert:  James replied 1 year ago. This is the first link I found. I would call your local dealer with the VIN and they can give you a more accurate price. In fact depending on the miles there might be a chance its under warranty. Please remember to rate my answer so I receive credit for assisting you.
Customer: replied 1 year ago.

wow thats expensive! anyway i can get this aftermarket or something like that?

If i don't replace this what are the side effects?

Expert:  James replied 1 year ago.
unfortunately the vehicle is to new for aftermarket modules to be available. nothing will happen you just wont have working ABS
Customer: replied 1 year ago.

oh ok. so the airbag light has nothing to do with the abs problem?

Expert:  James replied 1 year ago.
correct it shouldn't. The air bag light will have a different code if it is on