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Pinpoint Test Ag : DTC U0121:00: Notes

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 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 Diagnostic Methods in Service Information for information about these practices.

Normal Operation and Fault Conditions 

The ABS module and APIM communicate through the HS-CAN.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U0121:00 Lost Communication with Anti-Lock Brake System (ABS) Control Module: No Sub Type Information Set by the APIM when network messages are missing from the ABS module for more than 1 second with the ignition in RUN.
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