DTC U0402-68; Instrument Cluster Error Signals: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

Description	Instrument cluster error signals
Detection condition	Instrument cluster received the error signals from the transmission/transaxle for 1 s or more with the ignition switched ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	The transaxle could not send a normal signal temporarily. (DTCs are stored in the TCM.) TCM malfunction Instrument cluster malfunction
System wiring diagram	Not applicable