Lost Communication With anti - lock brake system (ABS) control module
Generic · network
Data confidence78%
The control module stopped receiving expected network messages from the anti - lock brake system (ABS) control module node on the vehicle communication bus.
Symptoms
Multiple warning lamps possible
Functions of the affected module unavailable
Possible causes
CAN bus wiring fault (open, short, chafed harness)
Faulty control module loading the bus
Connector or terminal corrosion
Power supply or ground fault of a module
Recommended checks
Perform a full-module scan to map which modules communicate
Check CAN bus resistance and voltages at the diagnostic connector
Inspect wiring and connectors of the affected module
Check module power supply and grounds
Disconnect suspect modules one at a time only with a documented procedure
Lost Communication With Anti- Lock Brake System (ABS) Control Module — No Sub Type Information
Ford · network
Data confidence96%
The Ford Explorer PSCM detected lost communication with anti- lock brake system (abs) control module with failure type 00, no sub type information. This interpretation is specific to the documented EPAS controller and model years.
Recommended checks
Perform a full module scan
Verify battery voltage and PSCM power supplies
Inspect EPAS wiring and connectors
Review PSCM snapshot and extended data
Follow the Ford EPAS diagnostic procedure
Applies toFord Explorer 2011-2012Power Steering Control Module (PSCM)|Electric Power Assisted Steering (EPAS)
Generic SAE-standard code: same meaning on every make.
121
Specific fault index within the subsystem.
Frequently asked questions about U0121
What does U0121 mean?
Lost Communication With anti - lock brake system (ABS) control module. The control module stopped receiving expected network messages from the anti - lock brake system (ABS) control module node on the vehicle communication bus.
Is U0121 generic or manufacturer-specific?
U0121 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.
Can TuningBot remove U0121 at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0121 is removable in your case.
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