DTC U2100; Start Stop Unit Configuration Not Completed: 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	Start stop unit configuration not completed
Detection condition	Start stop unit configuration not completed.
Fail-safe	Although the engine cannot be started with the ignition switched off or to ACC, if the ignition is switched ON (engine off), the engine can be started. NOTE: If the start stop unit configuration is not completed, the start stop unit setting will be for an ATX vehicle. For MTX vehicles, if the start stop unit cannot receive the CAN signal, the engine cannot be started because the vehicle cannot be recognized as a MTX vehicle.
Possible cause	NOTE: This DTC is output if configuration is not performed after replacing the start stop unit. Start stop unit configuration error Start stop unit malfunction
System wiring diagram	Not applicable