DTC U0420-00: EPS Control Module (Steering Angle Signal) Communication Error With EPS Control Module Error Signal Received From EPS Control Module: Outline

DTC U0420:00 (PCM, SKYACTIV-G, WITH MAZDA M HYBRID) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	EPS control module (steering angle signal) Communication error with EPS control module Error signal received from EPS control module
Detection condition	The PCM detects that the electronically controlled brake unit stores the following DTCs. C0051:25 C0051:62 C0051:64 C0051:67 C0051:84 C0051:85 C0051:86 U0131:00 U0420:68
Fail-safe	Inhibits the i-stop control. Inhibits the regenerative braking control.
Possible cause	DTCs are stored in the electronically controlled brake unit. NOTE: If the electronically controlled brake unit stores a DTC, the PCM stores the same DTC or similar. If the PCM stores a DTC even though the electronically controlled brake unit does not store a DTC, clear the DTC as it was for a past malfunction, and then complete the repair.
System wiring diagram	Not applicable
Connector diagram	Not applicable