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DTC U0402 00: Abnormal Message From Transmission/Transaxle: Notes

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0402:00 (DYNAMIC STABILITY CONTROL) DETECTION CONDITION AND POSSIBLE CAUSE

DTC  U0402:00  Abnormal message from transmission/transaxle 
DETECTION CONDITION 
  • The DSC HU/CM received error signals from the transmission/transaxle for 1 s or more  with the ignition switched ON (engine off or on).
FAIL-SAFE FUNCTION 
  • Illuminates the TCS/DSC indicator light and master warning light*1 .
  • Inhibits the TCS, Hill Launch Assist (HLA), vehicle roll prevention function*2 , DSC, Mazda Radar Cruise Control (MRCC)*2 , and Smart City Brake Support (SCBS)*2 controls.

*1 : Vehicles with Smart City Brake Support (SCBS).
*2 : If equipped.
POSSIBLE CAUSE 
  • The transmission/transaxle could not send a normal signal temporarily (DTCs are stored in the TCM)
  • Transmission/transaxle malfunction
  • DSC HU/CM malfunction
SYSTEM WIRING DIAGRAM  Not applicable
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