VOLVOUU All Engines (2017 Emissions) Fault Code: U300001 PID: EMS Electronic Control Unit
Battery voltage is monitored by the circuits within the Engine Control Module (ECM).
Conditions for diagnostic trouble code (DTC):
1) The voltage is more than 15V
Probable cause
1) Battery charger connected
2) Alternator
3) Damaged component, Engine Control Module
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