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Home >> Honda >> 2008 >> Fit Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Advanced Diagnostics >> DTC U0121 (107): Lost Communication with ABS Modulator-Control Unit (A/T) >> General Description (A/T)

General Description (A/T)

The controller area network (CAN) transmits/receives multiple signals to/from the multiple control modules simultaneously by using two signal lines (CANH and CANL).

When the powertrain control module (PCM) does not receive the signals from the ABS modulator-control unit via the CAN lines for more than a set time, the PCM detects a malfunction and a DTC is stored.