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U0121 Diagnostic Trouble Code Discussion for April 2009

Lost Communication With EBCM

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Trouble Ticket Help Requests for DTC U0121
Help Request Posted
2005 Mazda 6 S 3.0L MIL Lamp on, Communication VIN: 1YVFP80DX5
U0121: Communication Error To ABS-HU/CM. ... diag. sessions I was excited to get a communications diagnose but now I'm not so sure how fun they are. The dash is lit up like a Christmas tree (AT,MIL,ABS,TC on) We have a 2005 Mazda6 3.0L here with a communication problem also no speed on dash (which al...
April 06, 2009