DTC U3003-16: Power Supply (Low Input) [DSC HU/Cm]: Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

System malfunction location	Power supply (low input)
Detection condition	The DSC HU/CM detects that the DSC HU/CM power supply circuit voltage is less than 9 V.
Fail-safe	Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [DSC HU/CM (US)] .)
Possible cause	DTCs are stored in the PCM. Battery malfunction Generator malfunction DSC HU/CM connector or terminals malfunction Short to ground in DSC HU/CM power supply circuit DSC HU/CM malfunction
Courtesy of MAZDA MOTORS CORP.