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Pinpoint Test A : U0121: Notes

WARNING: This page is about a different car, the 2018 Ford F-350 Super Duty and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

DTC Fault Trigger Condition-PCM 

DTC Description Fault Trigger Conditions
U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module The PCM sets this DTC if data messages from the ABS module through the GWM are missing.

Normal Operation and Fault Conditions 

REFER to: Communications Network - System Operation and Component Description .

Possible Sources 

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