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Home >> Ford >> 2019 >> Fiesta ST Line, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 301 (EPAS Guided Routine) >> DTC/Symptom Selection >> DTC Index >> PSCM - Power Steering Control Module >> DTC U0100: Lost Communication with ECM/PCM A >> Diagnostic Aids
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Diagnostic Aids

WARNING: This page is about a different car, the 2019 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0100:00 indicates a possible failure of the HS-CAN which can be due to a circuit fault in the HS-CAN, the PSCM wiring harness or a PCM concern.

Do not install a new PSCM as part of the repair for a PSCM DTC U0100:00.

Initially steering assist remains unaffected, but once the PSCM has detected missing messages from the PCM 3 times, steering assist is reduced to a preset level. The PSCM sends a message to the IPC to display the POWER STEERING ASSIST FAULT in the message center.

The presence of DTC U0100:00 prevents the active park assist system (if equipped) and the lane keep assist function (if equipped) from activating. If set during an active park assist event, the event is terminated and the active park assist system is deactivated.

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