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Pinpoint Test A : U0121: Notes

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostic Overview 

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Service Information .

Refer to Starting System for schematic and connector information.

DTC Fault Trigger Condition- 

U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module The PCM sets this DTC if data messages received from the ABS module over the High Speed Controller Area Network (HS-CAN) are missing.

Normal Operation and Fault Conditions 

REFER to Module Communications Network .

Possible Sources 

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