DTC U0420-00; Electric Power Steering (EPS) Control Module Error: Notes

WARNING: This page is about a different car, the 2017 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

Description	Electric Power Steering (Eps) Control Module Error
Detection condition	Communication error between electric power steering (EPS) control module and radar unit
Fail-safe	Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the smart brake support (SBS) system control Inhibits the distance recognition support system (DRSS) control
Possible cause	DTCs are stored in the electric power steering (EPS) control module. Electric power steering (EPS) control module malfunction Radar unit malfunction
System wiring diagram	Not applicable