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Home › Fiat › 2017 › 500 Pop, Automatic Trans › Repair and Diagnosis › Transmission › Automatic Trans › (Transmission Control Module (TCM) - Electrical Diagnostics - 500) › DTC Troubleshooting › U0121-00 Lost Communication With Anti-Lock Brake System (Abs) Control Module › Set Condition

Set Condition

Bus messages not received from the Braking System Module (BSM) for approximately two to five seconds.