DTC U0420 00: Abnormal Message From EPS Cm: Notes

WARNING: This page is about a different car, the 2014 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0420 00 DETECTION CONDITIONS AND POSSIBLE CAUSES (DYNAMIC STABILITY CONTROL)

DTC	U0420:00	Abnormal message from EPS CM
DETECTION CONDITION	Correct data cannot be received from EPS CM
FAIL-SAFE FUNCTION	Illuminates the TCS/DSC indicator light and smart city brake support (SCBS) indicator light (amber)^1 . Tire pressure monitoring system warning light^1 illuminates after flashes. Inhibits the TCS, DSC, TPMS^1 , smart city brake support (SCBS)^1 controls. ^* : If equipped.
POSSIBLE CAUSE	EPS CM malfunction
SYSTEM WIRING DIAGRAM	Not applicable