Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1201 (STEERING SYSTEM - ELECTRONIC POWER ASSIST STEERING (EPAS))INTERACTIVE DIAGNOSTICSDTC / SYMPTOM SELECTIONDTC INDEX - POWER STEERING CONTROL MODULE (PSCM)DTC U0121: LOST COMMUNICATION WITH THE ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULEDESCRIPTION
2005 Ford Taurus SEL, 4D Sedan
DTC U0121: Lost Communication with the Anti-lock Brake System (ABS) Control Module: Description
2005 Ford Taurus SEL, 4D SedanSECTION Description
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The PSCM will monitor the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 9 volts and when there are no DTCs present that are inhibiting PSCM operation.
- DTC U0121:00 (Lost Communication with the Anti-lock Brake System (ABS) Control Module: No Sub Type Information) - This DTC will set when communication between the PSCM and the ABS fails. The ABS sends a steering angle sensor message to the PSCM. If this message is missing for more than 32 milliseconds and the PSCM has not set DTC U0001:88, then the PSCM will set U0121:00.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.