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U0121 Diagnostic Trouble Code Discussion for April 2020

Lost Communication With EBCM


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Trouble Ticket Help Requests for DTC U0121
Help Request Posted
2017 Ford F-150 Raptor 3.5L MIL Lamp on VIN: 1FTEW1C81H
U0121: lost communication with antilock brake. This truck intermittently loses communication on the hs2 can network. This causes the vehicle to light up like a xmas tree. It never acts up long enough to determine if its a shorted module or harness issue. I have gone through the harness the best I can. ...
April 13, 2020
2017 Ford F-150 Raptor 3.5L MIL Lamp on VIN: 1FTEW1C81H
U0121: lost communication with antilock brake. This truck intermittently loses communication on the hs2 can network. This causes the vehicle to light up like a xmas tree. It never acts up long enough to determine if its a shorted module or harness issue. I have gone through the harness the best I can. ...
April 14, 2020